Cassette Style AC-DC Converters K Series
Edition 5/5.2000 1/26
150 Watt AC-DC (DC-DC) Converters K Series
for 400 Hz Mains
• Input frequency range 47...440 Hz
• No PFC
•Extremely wide input voltage range
•Input over- and undervoltage lock-out
•Efficient input filter and built-in surge and transient
suppression circuitry
•Fully isolated outputs
•Outputs overload, open- and short-circuit proof
•No derating over entire operating temperature range
Summary
The K series of AC-DC (DC-DC) converters represents a
flexible range of power supplies for use in advanced elec-
tronic systems. Features include wide input frequency
range (no PFC), high efficiency, high reliability, low output
voltage noise and excellent dynamic response to load/line
changes.
The converter inputs are protected against surges and tran-
sients occuring at the source lines. An input over- and
undervoltage lock-out circuitry disables the outputs if the
input voltage is outside the specified range. Certain types
include an inrush current limitation preventing circuit break-
ers and fuses from being damaged at switch-on.
All outputs are open- and short-circuit proof and are pro-
tected against overvoltages by means of a built-in suppres-
sor diode. The outputs can be inhibited by a logic signal ap-
plied to the connector pin 18 (i). If the inhibit function is not
used pin 18 must be connected to pin 14 to enable the out-
puts.
LED indicators display the status of the converter and allow
visual monitoring of the system at any time.
Full input to output, input to case, output to case and output
to output isolation is provided. The modules are designed
and built according to the international safety standards
IEC/EN 60950 and have been approved by the safety
agencies LGA (Germany) und UL (USA). The UL Mark for
Canada has been officially recognized by regulatory au-
thorities in provinces across Canada.
The case design allows operation at nominal load up to
71°C in a free air ambient temperature. If forced cooling is
provided, the ambient temperature may exceed 71°C but
the case temperature must remain below 95°C under all
conditions.
A temperature sensor generates an inhibit signal which
disables the outputs if the case temperature
T
C exceeds the
limit. The outputs are automatically re-enabled when the
temperature drops below the limit.
Various options are available to adapt the converters to in-
dividual applications.
The modules may either be plugged into 19" rack systems
according to DIN 41494, or be chassis mounted.
Important: For applications with requirements for com-
pliance with IEC/EN 61000-3-2 (harmonic distortion)
please use our LK 4000 and LK 5000 series.
Safety according to IEC/EN 60950
168
6.6"
80
3.2"
16 TE
111
4.4"
3 U
Table of Contents Page
Summary .......................................................................... 1
Type Survey and Key Data .............................................. 2
Type Key .......................................................................... 2
Functional Description...................................................... 3
Electrical Input Data ......................................................... 4
Electrical Output Data ...................................................... 5
Auxiliary Functions ......................................................... 10
Page
Electromagnetic Compatibility (EMC) ............................ 13
Immunity to Environmental Conditions........................... 15
Mechanical Data ............................................................ 16
Safety and Installation Instructions ................................ 17
Description of Options .................................................... 20
Accessories .................................................................... 26
Input voltage range from 85...255 V AC
1 or 2 isolated outputs up to 48 V DC
4 kV AC I/O electric strength test voltage
LGA
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 2/26
Type Survey and Key Data
Non standard input/output configuration or special custom adaptions are available on request. See also:
Commercial Infor-
mation: Inquiry Form for Customized Power Supply.
Table 1: Type survey LK
Output 1 Output 2 Input voltage range and efficiency 1 Options
U
o nom
I
o nom
U
o nom
I
o nom
U
i min...
U
i max hmin
[V DC] [A] 2 [V DC] [A] 2 85…264 V AC (88...372 V DC) [%]
5.1 25.0 - - LK 1001-7R 79 -9
12.0 12.0 - - LK 1301-7R 84 E
15.0 10.0 - - LK 1501-7R 84 D
24.0 6.0 - - LK 1601-7R 85 V 5
24.0 3 6.0 - - LK 2320-7R 81 P
30.0 3 5.0 - - LK 2540-7R 83 T
48.0 3 3.0 - - LK 2660-7R 83 B1
12.0 6.0 12.0 4 6.0 LK 2320-7R 81 B2
15.0 5.0 15.0 4 5.0 LK 2540-7R 83
24.0 3.0 24.0 4 3.0 LK 2660-7R 83
1Efficiency at
U
i nom and
I
o nom.
2If the output voltages are increased
above
U
o nom via R-input control, op-
tion P setting, remote sensing or op-
tion T, the output currents should be
reduced accordingly so that
P
o nom
is not exceeded.
3Series connection of output 1 and 2,
see:
R-Function for different output
configurations
.
4Second output semi-regulated.
5Option V for LK 1001 types only.
Type Key
Type Key L K 2 5 40 -7 E R P D V T B1
Input voltage range
U
i: 85…264 V AC (88...372 V DC).... L
Series ............................................................................... K
Number of outputs....................................................... 1...2
Single output units:
Nominal voltage output 1 (main output)
, U
o1 nom
5.1 V ........................................................ 0, 1, 2
12 V ................................................................. 3
15 V ............................................................. 4, 5
24 V ................................................................. 6
other voltages.............................................. 7, 8
Other specs. for single output modules .................. 01...99
Symmetrical double output units:
Nominal voltage output 1/output 2,
U
o1/2 nom
12 V/12 V (24 V series connection)............... 20 1
15 V/15 V (30 V series connection)............... 40 1
24 V/24 V (48 V series connection)............... 60 1
other symmetrical voltages .................... 70...99
Ambient temperature range
T
A:
–25…71°C ..................................................... -7
–40…71°C ..................................................... -9
customer specific ..................................... -0...-6
Auxiliary functions and options:
Inrush current limitation ................................... E
Output voltage control input ........................... R 2
Potentiometer (output voltage adjustment) ..... P 2
Save data signal (D0...DD, to be specified) ... D 3
ACFAIL signal (V0, V2, V3, to be specified) ...V 3, 4
Current sharing ............................................... T
Cooling plate standard case ......................... B1
Cooling plate for long case 220 mm ............. B2
1External wiring of main and second output depending upon the desired output configuration (see:
R-Function for different output con-
figurations
).
2Feature R excludes option P and vice versa.
3Option D excludes option V and vice versa.
4Option V available for LK 1001 types.
Example: LK 2540-7PD3: AC-DC converter, input voltage range 85...264 V AC, double output, each providing 15 V/5 A,
equipped with potentiometer and undervoltage monitoring option. Ambient temperature –25...71°C.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 3/26
Functional Description
The input voltage is fed via an input fuse, an input filter, a
rectifier and an inrush current limiter to the input capacitor.
This capacitor sources a single transistor forward con-
verter. Each output is powered by a separate secondary
winding of the main transformer. The resultant voltages are
rectified and their ripples smoothed by a power choke and
output filter. The control logic senses the main output volt-
Fig. 1
Block diagram of single output converters LK 1000
age
U
o1 and generates, with respect to the maximum ad-
missible output currents, the control signal for the primary
switching transistor.
The second output of double output units is controlled by
the main output but has independent current limiting. If the
main output is driven into current limitation, the second out-
put voltage will fall as well and vice versa.
Input filter
Control circuit
P
2
Y
16 R
18 i
20 D/V
22 T
12 S+
4
6
8
10
14 S–
Y
Output
filter
1
30
32
24
3
–+
Y
Y
Forward converter
(approx. 120 kHz)
03085
Vo+
Vo–
26
28
N
P
1Transient suppressor (VDR)
2Inrush current limiter (NTC or option E), -9 version exclude the NTC
3Input fuse
Input filter
Control circuit
1
P
2
16 R
18 i
20 D
22 T
12 Vo1+
14 Vo1–
4
6
8
10
Output 2
filter
Output 1
filter
3
–+
Y
YY
Y
Y
Y
Forward converter
(approx.110 kHz)
03086
Vo2+
Vo2–
30
32
24
26
28
N
P
Fig. 2
Block diagram of symmetrical double output converters LK 2000
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 4/26
Static Input Current Characteristic
234561
1.00
U
i
DC
_______
U
i min
DC
I
i
(A)
3.00
0.40
04048
Fig. 4
Input current versus relative input voltage
Input Fuse
A fuse mounted inside the converter protects the module
against severe defects. If operated from a DC source this
fuse may not fully protect the module when the input volt-
age exceeds 200 V DC! In applications where the convert-
ers operate at source voltages above 200 V DC an external
fuse or a circuit breaker at system level should be installed!
Table 3:
Fuse Specification
Module Fuse type Fuse rating
LK 1slow-blow SPT 4 A, 250 V
1Fuse size 5 × 20 mm.
Input Under-/Overvoltage Lock-out
If the input voltage remains below approx. 0.8
U
i min or ex-
ceeds approx. 1.1
U
i max, an internally generated inhibit sig-
nal disables the output(s). When checking this function the
absolute maximum input voltage rating
U
i abs should be
considered! Between
U
i min and the undervoltage lock-out
level the output voltage may be below the value defined in
table:
Output data
(see:
Technical Information: Measuring
and Testing
).
Reverse Polarity Protection
The built-in bridge rectifier provides reverse polarity protec-
tion at the input.
Inrush Current Limitation
The modules of the versions -7 incorporate an NTC resistor
in the input circuitry which – at initial turn on – reduces the
peak inrush current value by a factor of 5...10 to protect
connectors and switching devices from damage. Subse-
quent switch-on cycles within short periods will cause an
increase of the peak inrush current value due to the warm-
ing-up of the NTC resistor. (see also:
option E
)
Inrush Current Peak Value
The inrush current peak value (initial switch-on cycle) can
be determined by following calculation: (See also:
Input In-
rush Current Characteristic
).
U
i source
I
inr p = ––––––––––––––––
(
R
s ext +
R
i +
R
NTC)
R
s ext
R
i
R
NTC
I
inr p
U
i source
+C
i int
04040
Fig. 3
Equivalent circuit diagram for input impedance
Electrical Input Data
General Conditions
–
T
A = 25°C, unless
T
C is specified.
– Pin 18 connected to pin 14,
U
o adjusted to
U
o nom (option P); R input not connected.
– Sense line pins S+ and S– connected to Vo+ and Vo– respectively.
Table 2: Input data
Input LK
Characteristics Conditions min typ max Unit
U
iOperating input voltage
I
o = 0…
I
o nom 85 264 V AC
T
C min…
T
C max 88 372 V DC
U
i nom Nominal input voltage 310 3
I
iInput current
U
i nom,
I
o nom 1 0.4 A
P
i0 No-load input power
U
i min…
U
i max 2.5 W
P
i inh Idle input power unit inhibited 1.5
R
iInput resistance
T
C = 25°C 480 mΩ
R
NTC NTC resistance 2 3200
C
iInput capacitance 210 400 µF
U
i RFI Conducted input RFI EN 55022 B
Radiated input RFI
U
i nom,
I
o nom B
U
i abs Input voltage limits –400 400 V DC
without damage –400 400 Vp
1With double output modules, both outputs
loaded with
I
o nom
2 Valid for -7 versions with NTC, (-9 versions ex-
clude the NTC). Initial switch-on cycle. Subse-
quent switch-on/off cycles increase the inrush
current peak value.
3LK types may also be operated in DC mode.
(See:
K Series, DC-DC Converters
)
AC frequency range 47...440 Hz (440 Hz
for 115 V mains).
Above 70 Hz (at
U
i = 264 V AC) the earth
lekage current may exceed 3.5 mA, speci-
fied in IEC/EN 60950. The built-in Y ca-
pacitors are specified for ≤100 Hz. Above
350 Hz the input voltage may not exceed
200 V AC.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 5/26
Input Inrush Current Characteristic
123 t [ms]
0
50
100
I
imp
[A]
130
04050
Fig. 6
Inrush current versus time at U
i max,
R
ext = 0
Hold-up Time versus relative Input Voltage
234561
2.00 U
i
AC
_______
U
i min
AC
t
h
(ms)
10.00
100.00
04049
Fig. 5
Hold-up time t
h
versus relative input voltage U
i
/U
i min
.
Input Transient Protection
A VDR together with the input fuse and a symmetrical input
filter form an effective protection against high input tran-
sient voltages.
Electrical Output Data
General Conditions
–
T
A = 25°C, unless
T
C is specified.
– Pin 18 (i) connected to pin 14 (S–/Vo1–),
U
o adjusted to
U
o nom (option P), R input not connected.
– Sense line pin 12 (S+) and pin 14 (S–) connected to pin 4 (Vo+) and pin 8 (Vo–) respectively.
Table 4a: Output data single output modules
Output LK 1001 LK 1301 LK 1501 LK 1601
5.1 V 12.0 V 15.0 V 24.0 V
Characteristics Conditions min typ max min typ max min typ max min typ max Unit
U
oOutput voltage
U
i nom,
I
o nom 5.07 5.13 11.93 12.07 14.91 15.09 23.86 24.14 V
U
op Overvoltage protection 7.6 21 26.5 43.5
(supressor diode)
I
o nom Output current 1
U
i min...
U
i max 25.0 12.0 10 6.0 A
T
C min...
T
C max
I
oL Output current limit 4
U
i min...
U
i max 26 12.2 10.2 6.2
u
o 7Output Low frequency
U
i nom,
I
o nom 5555mV
pp
voltage Switching freq. IEC/EN 61204 5555
noise Total BW = 20 MHz 50 70 60 90
D
U
o U Static line regulation
U
i min...
U
i nom,±15 ±25 ±30 ±30 mV
U
i nom...
U
i max,
I
o nom
D
U
o I Static load regulation
U
i nom,
I
o = 202530 40
(0.1...1)
I
o nom
u
o d 5 Dynamic Voltage
U
i nom,
I
o = ±100 ±100 ±100 ±80
load deviation
I
o nom ↔ 1/2
I
o nom
t
d 5 regulat. Recovery time IEC/EN 61204 0.3 0.4 0.4 0.4 ms
aUo Temperature coefficient
U
i min...
U
i max –1–1–1–1 mV/K
of output voltage 6 0...
I
o nom
1If the output voltages are increased above
U
o nom through R-input control, option P setting, remote sensing or option T, the output cur-
rents should be reduced accordingly so that
P
o nom is not exceeded.
4See:
Output Voltage Regulation of Single Output Units
or
Double Output Modules with Outputs 1 and 2 Connected in Series.
5See:
Dynamic load regulation of U
o1
and U
o2.
6Negative temperature coefficient (0...–3 mV/cell and K) available on request.
7 Measured according to IEC/EN 61204 sub clause 3.10 with a probe acc. to annex A of the same standards. (See:
Technical Informa-
tion: Measuring and Testing
)
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 6/26
Table 4b: Output data double output modules
Output LK 2320 LK 2540 LK 2660
(Outputs connected in Series) 24 V (2 × 12 V) 30 V (2 × 15 V) 48 V (2 × 24 V)
Characteristics Conditions min typ max min typ max min typ max Unit
U
oOutput voltage
U
i nom,
I
o nom 24.0 2 30.0 2 48.0 2 V
U
op Overvoltage protection 38 48 74
(supressor diode)
I
o nom Output current 1
U
i min...
U
i max 6.0 5.0 3.0 A
T
C min...
T
C max
I
oL Output current limit 4
U
i min...
U
i max 6.2 5.2 3.2
u
o 7Output Low frequency
U
i nom,
I
o nom 55 5mV
pp
voltage Switching freq. IEC/EN 61204 555
noise 3
Total BW = 20 MHz 80 80 90
D
U
o U Static line regulation
U
i min...
U
i nom ±40 ±30 ±50 mV
U
i nom...
U
i max
I
o nom
D
U
o I Static load regulation
U
i nom,
I
o =40 30 40
(0.1...1)
I
o nom
u
o d 5 Dynamic Voltage
U
i nom,
I
o = ±140 ±140 ±90
load deviation
I
o nom ↔ 1/2
I
o nom
t
d 5 regulat. Recovery time IEC/EN 61204 0.2 0.2 0.2 ms
aUo Temperature coefficient
U
i min...
U
i max –2.2 –2.2 –2.6 mV/K
of output voltage 6 0...
I
o nom
1If the output voltages are increased above
U
o nom through R-input control, option P setting, remote sensing or option T, the output cur-
rents should be reduced accordingly so that
P
o nom is not exceeded.
2Series connection for
U
o nom = 24 V, 30 V or 48 V, see:
R-Function for different output configurations.
3Shortest possible wiring for series connection at the connector.
4See:
Output Voltage Regulation of Single Output Units
or
Double Output Modules with Outputs 1 and 2 Connected in Series.
5See:
Dynamic load regulation of U
01
and U
02.
6Negative temperature coefficient (0...–3 mV/cell and K) available on request.
7Measured according to IEC/EN 61204 sub clause 3.10 with a probe acc. to annex A of the same standards. (See:
Technical Informa-
tion: Measuring and Testing
)
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 7/26
Table 4c: Output data double output modules
Output LK 2320 LK 2540
(Outputs independently loaded) 1 12 V/12 V 15 V/15 V
Characteristics Conditions Output 1 Output 2 Output 1 Output 2
min typ max min typ max min typ max min typ max Unit
U
oOutput voltage
U
i nom,
I
o nom 2 11.93 12.07 11.82 12.18 14.91 15.09 14.78 15.22 V
U
op Overvoltage protection 19 19 24 24
(supressor diode)
I
o nom Output current 3
U
i min...
U
i max 6.0 6.0 5.0 5.0 A
T
C min...
T
C max
I
oL Output current limit 4
U
i min...
U
i max 6.2 6.2 5.2 5.2
u
o 8Output Low frequency
U
i nom,
I
o nom 3333mV
pp
voltage Switching freq. IEC/EN 61204 3333
noise Total BW = 20 MHz 40 25 50 20
D
U
o U Static line regulation
U
i min...
U
i nom ±30 ±40 ±30 ±40 mV
U
i nom...
U
i max
I
o nom
D
U
o I Static load regulation
U
i nom,
I
o = 100 5100 5
(0.1...1)
I
o nom 5
u
o d 6 Dynamic Voltage
U
i nom,
I
o = ±80 ±80
load deviation
I
o nom ↔ 1/2
I
o nom
t
d 6 regulat. Recovery time IEC/EN 61204 0.2 0.2 ms
aUo Temperature coefficient
U
i min...
U
i max –1.1 –1.1 mV/K
of output voltage 7 0...
I
o nom
Table 4d: Output data double output modules
Output LK 2660
(Outputs independently loaded) 1 24 V/24 V
Characteristics Conditions Output 1 Output 2
min typ max min typ max Unit
U
oOutput voltage
U
i nom,
I
o nom 2 23.86 24.14 23.64 24.36 V
U
op Overvoltage protection 37 37
(supressor diode)
I
o nom Output current 3
U
i min...
U
i max 3.0 3.0 A
T
C min...
T
C max
I
oL Output current limit 4
U
i min...
U
i max 3.2 3.2
u
o 8Output Low frequency
U
i nom,
I
o nom 33mV
pp
voltage Switching freq. IEC/EN 61204 33
noise Total BW = 20 MHz 50 20
D
U
o U Static line regulation
U
i min...
U
i nom,±30 ±50 mV
U
i nom...
U
i max,
I
o nom
D
U
o I Static load regulation
U
i nom,
I
o =50
5
(0.1...1)
I
o nom 5
u
o d 6 Dynamic Voltage
U
i nom,
I
o = ±50
load deviation
I
o nom ↔ 1/2
I
o nom
t
d 6 regulat. Recovery time IEC/EN 61204 0.2 ms
aUo Temperature coefficient
U
i min...
U
i max -1.3 mV/K
of output voltage 7 0...
I
o nom
1Depending upon the desired output
configuration the wiring should be
made as shown in:
R-Function for
different output configurations.
2Same conditions for both outputs.
3If the control voltages are in-
creased above
U
o nom via R-input
control, option P setting, remote
sensing or option T, the output cur-
rents should be reduced accord-
ingly so that
P
o nom is not ex-
ceeded.
4See:
Output voltage regulation of
single output units.
5Condition for specified output.
Other output loaded with constant
current
I
o =
I
o nom. See:
Output volt-
age regulation of double output
modules with output 1 and 2 in
symmetrical configuration.
6See:
Typical dynamic load regula-
tion of U
o1
and U
o2.
7Negative temperature coefficient
(0....–3 mV/cell and K) available on
request.
8Measured according to IEC/EN
61204 sub clause 3.10 with a
probe acc. to annex A of the same
standards. (See:
Technical Infor-
mation: Measuring and Testing
.)
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 8/26
Thermal Considerations
If a converter is located in free, quasi-stationary air (con-
vection cooling) at the indicated maximum ambient tem-
perature
T
A max (see table:
Temperature specifications)
and
is operated at its nominal input voltage and output power,
the temperature measured at the
Measuring point of case
temperature T
C
(see:
Mechanical Data
) will approach the
indicated value
T
C max after the warm-up phase. However,
the relationship between
T
A and
T
C depends heavily on the
conditions of operation and integration into a system. The
thermal conditions are influenced by input voltage, output
current, airflow and temperature of surrounding compo-
nents and surfaces.
T
A max is therefore, contrary to
T
C max,
an indicative value only.
Caution: The installer must ensure that under all operat-
ing conditions
T
C remains within the limits stated in the
table:
Temperature specifications.
Notes: Sufficient forced cooling or an additional heat sink
allows
T
A to be higher than 71°C (e.g. 85°C) if
T
C max is not
exceeded.
For -7 or -9 units at an ambient temperature
T
A of 85°C with
only convection cooling, the maximum permissible current
for each output is approx. 40% of its nominal value as per
figure.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
50 60 70 80 90 100
Io/Io nom
T
A [°C]
0.9
1.0
Forced cooling
05089
T
A min
TC max
Convection cooling
Fig. 7
Output current derating versus temperature for –7 and –9.
Thermal Protection
A temperature sensor generates an internal inhibit signal
which disables the outputs if the case temperature exceeds
T
C max. The outputs are automatically re-enabled if the tem-
perature drops below this limit.
It is recommended that continuous operation under simul-
taneous extreme worst case conditions of the following
three parameters be avoided: Minimum input voltage,
maximum output power and maximum temperature.
Output Protection
Each output is protected against overvoltage which could
occur due to a failure of the control circuit by means of a
voltage suppressor diode which, under worst case condi-
tions, may become a short circuit. The suppressor diodes
are not designed to withstand externally applied over-
voltages. Overload at any of the two outputs will cause a
shut-down of both outputs. A red LED indicates the over-
load condition.
U
o1d
U
o1d
t
d
t
d
U
r
U
r
t
t
t
U
o2d
<10 µs<10 µs
U
o1
U
o2
I
o1
/I
o1 nom
0
0.5
1
I
o2
/I
o2 nom
05072
Fig. 8
Control deviation of u
o1/2 d
vs. dynamic load change.
Output Voltage Regulation of Single or Double Output
Modules with Outputs1 and 2 Connected in Series
Uo
Uo nom
0.98
0.5
00.5 1.0
Io1
IoL
Io
Io nom
05068
Fig. 9
U
o1
versus I
o1
(typ.) of single output units
Parallel or Series Connection of Units
Single or double output units with equal nominal output volt-
age can be connected in parallel without any precautions
using option T.
With option T (current sharing), all units share the current
approximately equally.
Single output units and/or main and second outputs of dou-
ble output units can be connected in series with any other
(similar) output.
Note:
–Parallel connection of double output units should always
include both, main and second output to maintain good
regulation of both outputs.
–Not more than 5 units should be connected in parallel.
–Series connection of second outputs without involving
their main outputs should be avoided as regulation may
be poor.
–The maximum output current is limited by the output with
the lowest current limitation if several outputs are con-
nected in series.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 9/26
Output Voltage Regulation of Double Output Modules
with Output 1 and 2 in Symmetrical Configuration
Output 1 is under normal conditions regulated to
U
o1 nom,
independent of the output currents.
U
o2 is dependent upon the load distribution. When both out-
puts are loaded with more than 10% of
I
o nom, the deviation
of
U
o2 remains within ±5% of the value of
U
o1. The following
3 figures show the regulation with varying load distribution.
If
I
o1 =
I
o2 or the two outputs are connected in series, the de-
viation of
U
o2 remains within ±1% of the value of
U
o1 pro-
vided that a total load of more than 10% of
I
o nom is applied.
Two outputs of a single K 2000 module connected in paral-
lel will behave like the output of a K 1000 module; the paral-
leled output is fully regulated. No precautions are neces-
sary in using the R-input and the test sockets.
Fig. 12
LK 2660:
D
U
o2
(typ.) versus I
o2
with different I
o1
[V] U
o2
I
o2
[A]
0 0.5 1 1.5 2 2.5 3
I
o nom
3.5 4
23.0
23.5
24.0
24.5
25.0
25.5
26.0 I
o1
= 3.0 A
I
o1
= 2.0 A
I
o1
= 1.0 A
I
o1
= 0.5 A
I
o1
= 0.3 A
05107
0123456
I
o nom
7
I
o2
[A]
14.00
14.25
14.50
14.75
15.00
15.25
15.50
15.75
[V] U
o2
I
o1
= 5.00 A
I
o1
= 3.75 A
I
o1
= 2.50 A
I
o1
= 1.25 A
I
o1
= 0.50 A
05106
Fig. 11
LK 2540:
D
U
o2
(typ.) versus I
o2
with different I
o1
Fig. 10
LK 2320:
D
U
o2
(typ.) vs. I
o2
with different I
o1
0123456
Io nom
78
Io2
[A]
11.2
11.4
11.6
11.8
12.0
12.2
12.4
12.6
[V] Uo2
Io1 = 6.0 A
Io1 = 4.5 A
Io1 = 3.0 A
Io1 = 1.5 A
Io1 = 0.6 A
05105
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 10/26
0
t
t
0
Inhibit
1
0.1
1
U
o
/
U
o nom
t
r
t
f
06001
Fig. 15
Output response as a function of inhibit control
Auxiliary Functions
i Inhibit for Remote On and Off
Note: With open i input: Output is disabled (
U
o = off).
The outputs of the module may be enabled or disabled by
means of a logic signal (TTL, CMOS, etc.) applied between
the inhibit input i and the negative pin of output 1 (Vo1–). In
systems with several units, this feature can be used, for ex-
ample, to control the activation sequence of the converters.
If the inhibit function is not required, connect the inhibit pin
18 to pin 14 to enable the outputs (active low logic, fail
safe). For output response refer to:
Hold-up Time and Out-
put Response
.
Vi+
Vi–Vo–
i
Vo+
I
inh
U
inh
06031
1.6
0.8
0
–0.8
–50
U
inh
[V]
I
inh
[mA]
–30 0–10 10 30 50
2.0
1.2
0.4
–0.4
U
inh
= 0.8 V
U
o
= on
U
o
= off
U
inh
= 2.4 V
06032
Fig. 13
Definition of U
inh
and I
inh
.
Fig. 14
Typical inhibit current I
inh
versus inhibit voltage U
inh
Table 5: Inhibit characteristics
Characteristic Conditions min typ max Unit
U
inh Inhibit
U
o = on
U
i min…
U
i max –50 0.8 V
voltage
U
o = off 2.4 50
I
inh Inhibit current
U
inh = 0 –400 µA
t
rRise time 30 ms
t
fFall time depending on
I
o
Sense Lines
(Only for single output units 5.1 V, 12 V, 15 V, 24 V)
This feature enables for compensation of voltage drops
across the connector contacts and if necessary, across the
load lines. If the sense lines are connected at the load
rather than directly at the connector, the user should ensure
that
U
o max (between Vo1+ and Vo1–) is not exceeded. We
recommend connecting the sense lines directly at the fe-
male connector.
For further information, please refer to:
Application Notes
.
To ensure correct operation, both sense lines (S+ and S–)
should be connected to their respective power outputs
(Vo1+ and Vo1–) and the voltage difference between any
sense line and its respective power output pin (as meas-
ured on the connector) should not exceed the following val-
ues:
Table 6: Maximum Voltage compensation allowed using
sense lines
Output Total voltage difference Voltage difference
voltage between sense lines and between
their respective outputs Vo– and S–
5.1 V <0.5 V <0.25 V
12 V, 15 V <1.0 V <0.25 V
If the output voltages are increased above
U
o nom via R-in-
put control, option P setting, remote sensing or option T, the
output currents must be reduced accordingly so that
P
o nom is not exceeded.
Important: The output terminals Vo1+ and Vo1– must
always be connected to the load before connecting the
sense lines S+ and S–, otherwise the unit will be dam-
aged.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 11/26
R
Vo1+
Vo1–
S–U
ext
N
P
Module
Module
R
ext
R'
ext
14
16
16
14
+
S+
Vo1+
Vo1–
S–
N
P
R
12
06003
Programmable Output Voltage (R-Function)
As a standard feature, the modules offer an adjustable out-
put voltage, identified by letter R in the type designation.
The control input R (pin 16) accepts either a control voltage
U
ext or a resistor
R
ext to adjust the desired output voltage.
When not connected, the control input automatically sets
the output voltage to
U
o nom.
a) Adjustment by means of an external control voltage
U
ext
between pin 16 (R) and pin 14:
The control voltage range is 0...2.75 V DC and allows an
output voltage adjustment in the range of approximately
0...110%
U
o nom.
U
o
U
ext = –––––– • 2.5 V (approximate formula)
U
o nom
b) Adjustment by means of an external resistor:
Depending upon the value of the required output voltage
the resistor shall be connected
either: Between pin 16 and pin 14 (
U
o <
U
o nom) to
achieve an output voltage adjustment range of approxi-
mately 0...100%
U
o nom
or: Between pin 16 and pin 12 (
U
o >
U
o nom) to achieve
an output voltage adjustment range of approximately
100...110%
U
o nom.
Warning:
–
U
ext shall never exceed 2.75 V DC.
–The value of
R'
ext shall never be less than the lowest
value as indicated in table
R'
ext (for
U
o >
U
o nom) to
avoid damage to the unit!
Remarks:
–The R-Function excludes option P (output voltage adjust-
ment by potentiometer).
–If the output voltages are increased above
U
o nom via R-
input control, option P setting, remote sensing or option
T, the output current(s) should be reduced accordingly so
that
P
o nom is not exceeded.
–The R-input (as well as option P) is related to the main
output.
–With double output units the second output follows the
value of the controlled main output. Resistor values as in-
dicated for the single output units should be used.
–For correct output voltage adjustment of double output
units the external wiring of the outputs should be accord-
ing to:
R-Function for different output configuration
de-
pending upon the desired output configuration.
–In case of parallel connection the output voltages should
be individually set within a tolerance of 1...2%.
Fig. 16
Output voltage control for single output units LK 1000 by
means of the R input
Table 7a: R
ext
for U
o
<
U
o nom
; approximate values (U
i nom,
I
o nom
, series E 96 resistors); R'
ext
=
∞
U
o nom = 5.1 V
U
o nom = 12 V
U
o nom = 15 V
U
o nom = 24 V
U
o (V)
R
ext [kΩ]
U
o [V] 1
R
ext [kΩ]
U
o [V] 1
R
ext [kΩ]
U
o [V] 1
R
ext [kΩ]
0.5 0.422 2 4 0.825 2 4 0.56 4 8 0.825
1.0 1 3 6 1.3 4 8 1.47 6 12 1.33
1.5 1.62 4 8 1.96 6 12 2.61 8 16 1.96
2.0 2.16 5 10 2.87 8 16 4.64 10 20 2.87
2.5 3.83 6 12 3.83 9 18 6.19 12 24 3.83
3.0 5.61 7 14 5.62 10 20 8.25 14 28 5.61
3.5 9.09 8 16 8.28 11 22 11.0 16 32 8.25
4.0 14.7 9 18 12.1 12 24 16.2 18 36 12.1
4.5 28.7 10 20 19.6 13 26 26.1 20 40 19.6
5.0 196 11 22 42.2 14 28 56.2 22 44 46.4
Table 7b:
R’
ext
for U
o
>
U
o nom
; approximate values (U
i nom
, I
o nom
, series E 96 resistors); R
ext
=
∞
U
o nom = 5.1 V
U
o nom = 12 V
U
o nom = 15 V
U
o nom = 24 V
U
o [V]
R'
ext [kΩ]
U
o [V] 1
R'
ext [kΩ]
U
o [V] 1
R'
ext [kΩ]
U
o [V] 1
R'
ext [kΩ]
5.15 422 12.1 24.2 1780 15.2 30.4 1470 24.25 48.5 3160
5.2 215 12.2 24.4 909 15.4 30.8 750 24.5 49.0 1620
5.25 147 12.3 24.6 623 15.6 31.2 511 24.75 49.5 1100
5.3 110 12.4 24.8 464 15.8 31.6 383 25.0 50.0 825
5.35 90.9 12.5 25.0 383 16.0 32.0 316 25.25 50.5 681
5.4 75 12.6 25.2 316 16.2 32.4 261 25.5 51.0 562
5.45 61.9 12.7 25.4 286 16.4 32.8 237 25.75 51.5 511
5.5 56.2 12.8 25.6 234 16.5 33.0 215 26.0 52.0 464
13.0 26.0 196 26.25 52.5 422
13.2 26.4 162 26.4 52.8 383
1First column: single output units or double output units with separated outputs, second column: outputs in series connection
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 12/26
R'ext
Rext
14
16
Vo1–
Vo1+
R
Vo2–
Vo2–
Vo2+
Vo2+
12
10
8
6
4
+
–
Uo1
12 V
15 V
24 V
1
06005
R'
ext
R
ext
14
16
Vo1–
Vo1+
R
Vo2–
Vo2–
Vo2+
Vo2+
12
10
8
6
4
U
o2
0 V
–12/–15/–24 V
+12/+15/+24 V
U
o1
1
1
+
–
06006
R'
ext
R
ext
14
16
Vo1–
Vo1+
R
Vo2–
Vo2–
Vo2+
Vo2+
12
10
8
6
4
U
o1
+24/+30/+48 V
+12/+15/+24 V
0 V
U
o2
1
1
2
+
+
06007
R'
ext
R
ext
14
16
Vo1–
Vo1+
R
Vo2–
Vo2–
Vo2+
Vo2+
12
10
8
6
4
+
–
U
o1
24 V
30 V
48 V
1
2
06004
R'ext
Rext
14
16
Vo1–
Vo1+
R
Vo2–
Vo2–
Vo2+
Vo2+
12
10
8
6
4+
–
Uo2
12 V
15 V
24 V –
+
12 V
15 V
24 V
Uo1 1
1
06008
R-Function for different output configurations
Fig. 17a
LK 2000 with H15 connector. R-input for output voltage
control. Wiring for output voltage 24 V or 30 V or 48 V with
main and second output connected in series.
Fig. 17b
LK 2000 with H15 connector. R-input for output voltage
control. Wiring for output voltage 12 V or 15 V or 24 V
with main and second output connected in parallel.
Fig. 17c
LK 2000 with H15 connector. R-input for output voltage
control. Wiring of main and second output for two sym-
metrical output voltages U
o1
and U
o2
:
±
12 V or
±
15 V or
±
24 V.
Fig. 17d
LK 2000 with H15 connector. R-input for output voltage
control. Wiring of main and second output for two output
voltages U
o1
and U
o2
: +12 V
and +24 V or +15 V
and
+30 V or +24 V and +48 V.
Fig. 17e
LK 2000 with H15 connector. R-input for output voltage
control. Wiring of main and second output for two output
voltages U
o1
and U
o2:
12 V/12 V or 15 V/15 V or
24 V/24 V, the outputs are galvanically isolated.
Remarks:
Double output units fitted with H-15 connectors have the
output pins of the second output, pins 4/6 and 8/10, inter-
nally paralleled.
It is recommended that pins 4/6 and 8/10 be directly paral-
leled at the female connector as well to reduce the voltage
drop across the connector.
Please note:
U
o2 varies depending upon its own load and
the load on output 1.
1A ceramic multilayer capacitor connected across the load re-
duces ripple and spikes.
2Shortest possible wiring for series connection at the female con-
nector
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 13/26
Display Status of LEDs
U
o1
> 0.95...0.98
U
o1 adj
U
i max
U
i ov
U
i min
U
i uv
U
i
U
i abs
OK
i
U
o1
> 0.95...0.98
U
o1 adj
I
o nom
I
oL
I
o
OK
I
o L
U
o1
< 0.95...0.98
U
o1 adj
T
C
i
T
C max
T
PTC threshold
U
i inh
i
+50 V
+0.8 V +2.4 V
-50 V
U
inh threshold
I
o L
LED off LED on
LED Status undefined
06002
Fig. 18
LEDs
"
OK
"
,
"
i
"
and
"
I
o L"
status versus input voltage
Conditions: I
o £
I
o nom
, T
C £
T
C max
, U
inh £
0.8 V
U
i uv
= undervoltage lock-out, U
i ov
= overvoltage lock-out
LEDs
"
OK
"
and
"
I
o L"
status versus output current
Conditions: U
i min...
U
i max
, T
C £
T
C max
, U
inh £
0.8 V
LED
"
i
"
versus case temperature
Conditions: U
i min...
U
i max
, I
o £
I
o nom
, U
inh £
0.8 V
LED
"
i
"
versus U
inh
Conditions: U
i min...
U
i max
, I
o £
I
o nom
, T
C £
T
C max
Test Sockets (Main output only )
Test sockets for measuring the output voltage
U
o1 are lo-
cated at the front of the module. The positive test socket is
protected by a series resistor (see:
Functional Description,
block diagrams
). The voltage measured at the test sockets
is approximately 30 mV lower than the value measured at
the output terminals.
In case of double output units externally connected in se-
ries for
U
o = 24 V, 30 V or 48 V the monitored output volt-
age is 12 V, 15 V or 24 V respectively.
Electromagnetic Emission
Electromagnetic Compatibility (EMC)
Fig. 19
Typical disturbance voltage (quasi-peak) at the input ac-
cording to CISPR 11/22 and EN 55011/22, measured at
U
i nom
and I
o nom.
1
2
5
6
0300
0.6
0.2
0.4
1.0 100
10
factor y
(I
rms bat
/I
load
)
R
sys
[mΩ]
3
4
Number of LT units:
06037
50
40
30
20
10
0
30
50
100
200
500
1000
[dBµV/m]
[MHz]
A
B
07077
Fig. 20
Typical radiated electromagnetic field strength (quasi-
peak) according to CISPR 11/22 and EN 55011/22, nor-
malized to a distance of 10 m, measured at U
i nom
and
I
o nom.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 14/26
Electromagnetic Immunity
Table 8: Immunity type tests
Phenomenon Standard 1 Level Coupling Value Waveform Source Test In Per-
mode 2 applied imped. procedure oper. form. 3
Voltage surge IEC 60571-1 i/c, +i/–i 800 Vp100 µs 100 Ω1 pos. and 1 neg. yes A
1500 Vp50 µsvoltage surge per
3000 Vp5 µscoupling mode
4000 Vp1 µs
7000 Vp100 ns
Supply related RIA 12 B +i/–i 1.5 •
U
batt 1 s 0.2 Ω1 positive yes A
surge surge
Direct transient C +i/c, –i/c 960 Vp10/100 µs5 Ω5 pos. and 5 neg. yes B
D 1800 Vp5/50 µsimpulses
E 3600 Vp0.5/5 µs 100 Ω
F 4800 Vp0.1/1 µs
G 8400 Vp0.05/0.1 µs
Indirect coupled H +o/c, -o/c 1800 Vp5/50 µs
transient J 3600 Vp0.5/5 µs
K 4800 Vp0.1/1 µs
L 8400 Vp0.05/0.1 µs
Electrostatic IEC/EN 4 contact discharge 8000 Vp1/50 ns 330 Ω10 positive and yes A
discharge 61000-4-2 air discharge 15000 Vp10 negative
(to case) discharges
Electromagnetic IEC/EN 3 antenna 10 V/m AM 80% n.a. 26…1000 MHz yes A
field 61000-4-3 1 kHz
Electromagnetic ENV 50204 50% duty cycle, 900 ±5 MHz yes A
field, 200 Hz repetition
pulse modulated frequency
Electrical fast IEC/EN 4 capacitive, o/c 2000 Vpbursts of 5/50 ns 50 Ω1 min positive yes A
transient/burst 61000-4-4 i/o, +i/–i 4000 Vp2.5/5 kHz over 1 min negative
direct 15 ms; burst transients per
period: 300 ms coupling mode
Surge IEC/EN 3 i/c 2000 Vp1.2/50 µs 12 Ω5 pos. and 5 neg. yes A
61000-4-5 4 +i/–i2 Ωsurges per
coupling mode
Conducted IEC/EN 3 i, o, signal wires 10 Vrms AM 80% 150 Ω0.15...80 MHz yes A
disturbances 61000-4-6 (140 dBµV) 1 kHz
1Related and previous standards are referenced in
Technical Information: Standards
.
2i = input, o = output, c = case.
3A = Normal operation, no deviation from specifications, B = Normal operation, temporary deviation from specs possible.
4 Test in progress, please consult factory.
Note: Previous standards are referenced in:
Technical In-
formation: Standards
A suppressor diode or a metal oxide VDR (depending upon
the type) together with an input fuse and an input filter form
an effective protection against high input transient voltages
which typically occur in most installations, but especially in
battery driven mobile applications. The S-series has been
successfully tested to the following specifications:
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 15/26
Table 10: Temperature specifications, values given are for an air pressure of 800...1200 hPa (800...1200 mbar)
Temperature Standard -7 Option -9
Characteristics Conditions min max min max Unit
T
AAmbient temperature
U
i min...
U
i max –25 71 –40 71 °C
T
CCase temperature
I
o = 0...
I
o nom –25 95 –40 95
T
SStorage temperature Not operational –40 100 –55 100
Immunity to Environmental Conditions
Table 9: Mechanical stress
Test method Standard Test conditions Status
Ca Damp heat IEC/DIN IEC 60068-2-3 Temperature: 40 ±2 °C Unit not
steady state MIL-STD-810D section 507.2 Relative humidity: 93 +2/-3 % operating
Duration: 56 days
Ea Shock IEC/EN/DIN EN 60068-2-27 Acceleration amplitude: 100 gn = 981 m/s2Unit
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 6 ms operating
Number of bumps: 18 (3 each direction)
Eb Bump IEC/EN/DIN EN 60068-2-29 Acceleration amplitude: 40 gn = 392 m/s2Unit
(half-sinusoidal) MIL-STD-810D section 516.3 Bump duration: 6 ms operating
Number of bumps: 6000 (1000 each direction)
Fc Vibration IEC/EN/DIN EN 60068-2-6 Acceleration amplitude: 0.35 mm (10...60 Hz) Unit
(sinusoidal) MIL-STD-810D section 514.3 5 gn = 49 m/s2 (60...2000 Hz) operating
Frequency (1 Oct/min): 10...2000 Hz
Test duration: 7.5 h (2.5 h each axis)
Fda Random vibration IEC 60068-2-35 Acceleration spectral density: 0.05 gn2/Hz Unit
wide band DIN 40046 part 23 Frequency band: 20...500 Hz operating
Reproducibility Acceleration magnitude: 4.9 gn rms
high Test duration: 3 h (1 h each axis)
Kb Salt mist, cyclic IEC/EN/DIN IEC 60068-2-52 Concentration: 5% (30°C) Unit not
(sodium chloride Duration: 2 h per cycle operating
NaCl solution) Storage: 40°C, 93% rel. humidity
Storage duration: 22 h per cycle
Number of cycles: 3
Table 11: MTBF
Values at Specified Type Ground Benign Ground Fixed Ground Mobile Unit
Case Temperature 40°C40°C70°C50°C
MTBF 1 LK 1000 500'000 150'000 80'000 50'000 h
Device hours 2 LK 2000 500'000
1 Calcualted in accordance with MIL-HDBK217F.
2 Statistical values, based on an average of 4300 working hours per year and in general field use, over 3 years.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 16/26
159 4.5
89
111 (3U)
168.5 ±0.5
d
80
4.5
19.7
9.5
29.9
6.5
51.5
30.3
20.3
12.1
10.3
7.0
3.27
7 TE 9 TE
Test jacks (+/–)
Option P (
U
o)
Option D (
U
ti)
LED OK (green)
LED i (red)
LED IoL (red)
Option D (
U
to)
25.9 11.8
Front plate Main face Back plate
Measuring point of
case temperature
T
C
171.93 (DIN 41494)
50
= Ø 3.5
= Ø 4.1
09002
42
Gravitational
axis
Fig. 22
Aluminium case K02 with option B1 (cooling plate), black
finish and self cooling. Total weight: Approx. 1.15 kg
Mechanical Data
Dimensions in mm. Tolerances ±0.3 mm unless otherwise indicated.
Fig. 21
Aluminium case K02 with heatsink, black finish and self
cooling, weight: Approx. 1.55 kg
Note:
–d ≥15 mm, recommended minimum distance
to next part to ensure proper air circulation at
full output power.
–free air locations: the module should be
mounted with fins in vertical position to
achieve a maximum air flow through the heat
sink.
111 (3U)
17.3 133.4
168
±0.5
101
5
47.2
158
5
M 4
5
Measuring point of
case temperature
T
C
50
171.93 (DIN 41494)
3.27
7 TE 4 TE
09003
European
Projection
Note: Long case with S-type heatsink or
B2 cooling plate, elongated by 60 mm
for 220 mm rack depth, is available on
request. (No LED's, no test jacks)
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 17/26
Safety and Installation Instructions
Connector Pin Allocation
The connector pin allocation table defines the electrical
potentials and the physical pin positions on the H15, H15
S4 connector. Pin no. 24, the protective earth pin present
Table 12: H15 Connector pin allocation
Pin Connector type H15 S4 Connector type H 15
No. LK 1001 LK 1301/1501/1601 LK 2000
4Vo1+ Output 1 Vo1+ Output 1 Vo2+ Output 2
6 Vo1+ Output 1 Vo2+ Output 2
8Vo1–Output 1 Vo1–Output 1 Vo2–Output 2
10 Vo1–Output 1 Vo2–Output 2
12 S+ Sense S+ Sense Vo1+ Output 1
14 S–Sense S–Sense Vo1–Output 1
16 R 1 Control of
U
o1 R 1 Control of
U
o1 R 1 Control of
U
o1
18 i Inhibit i Inhibit i Inhibit
20 D 3 Save data D Save data D Save Data
V 3 ACFAIL
22 T Current sharing T Current sharing T Current sharing
24 2 Protective earth Protective earth Protective earth
26 N Neutral N Neutral N Neutral
28 N Neutral N Neutral
30 P Phase P Phase P Phase
32 P Phase P Phase
1Feature R excludes option P and, vice versa
2Leading pin (pregrounding)
3Option D excludes option V and vice versa.
Fig. 24
View of module’s male H15 S4 connector
on all LK AC-DC converters is leading, ensuring that it
makes contact with the female connector first.
432
Type H15
Fixtures for connector
retention clips V
(see Accessory Products)
10010
4/630/32
Type H15 S4
Fixtures for connector
retention clips V
(see Accessory Products)
10010
Fig. 23
View of module’s male H15 connector
Standards and Approvals
All AC-DC converters correspond to class I equipment.
They are UL recognized according to UL 1950, UL recog-
nized for Canada to CAN/CSA C22.2 No. 950-95 and LGA
approved to IEC/EN 60950 standards.
The units have been evaluated for:
•Building in
•Basic insulation between input and case, based on 250 V
AC and 400 V DC
•Double or reinforced insulation between input and output,
based on 250 V AC and 400 V DC
•Basic insulation between output and case based on
200 V AC and DC
•Operational insulation between output and output
•The use in a pollution degree 2 environment
•Connecting the input to a primary or secondary circuit
which is subject to a maximum transient rating of 2500 V
(overvoltage category III based on a 110 V primary cir-
cuit, overvoltage category II based on a 230 V primary
circuit).
The AC-DC converters are subject to manufacturing sur-
veillance in accordance with the above mentioned UL,
CSA, EN and with ISO 9001 standards.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 18/26
Table 13: Isolation
Characteristic Input to Input to Output to Output to Unit
case output case output
Electric Required according to 1.5 3.0 1 ––kVrms
strength IEC/EN 60950 2.1 4.2 1 ––kV DC
test voltage Actual factory test 1 s 2.8 5.6 1 1.4 0.14
AC test voltage equivalent 2.0 4.0 1 1.0 0.1 kVrms
to actual factory test
Insulation resistance at 500 V DC >300 >300 >300 >100 2 MΩ
1In accordance with IEC/EN 60950 only subassemblies are tested in factory with this voltage.
2Tested at 100 V DC.
For creepage distances and clearances refer to:
Technical Information: Safety.
Installation Instructions
The K series AC-DC converters are components, intended
exclusively for inclusion within other equipment by an in-
dustrial assembly operation or by professional installers. In-
stallation must strictly follow the national safety regulations
in compliance with the enclosure, mounting, creepage,
clearance, casualty, markings and segregation require-
ments of the end-use application.
Connection to the system shall be made via the female con-
nector H15/H15 S4 (see:
Accessories
)
.
Other installation
methods may not meet the safety requirements.
The AC-DC converters are provided with pin no. 24 ( ),
which is reliably connected with their case. For safety rea-
sons it is essential to connect this pin with the protective
earth of the supply system.
An input fuse is built-in in the connection from pins no. 30
and 32 (P ) of the unit. Since this fuse is designed to pro-
tect the unit in case of an overcurrent and does not neces-
sarily cover all customer needs, an external fuse suitable
for the application and in compliance with the local require-
ments might be necessary in the wiring to one or both input
potentials, pins nos. 26 and 28 and/or nos. 30 and 32.
Important: Whenever the inhibit function is not in use, pin
no. 18 (i) should be connected to pin no. 14 (S–/Vo1–) to
enable the output(s).
Do not open the modules, or guarantee will be invalidated.
Due to high current values, all LK units provide two inter-
nally parallel connected contacts for certain paths (pins 4/6,
8/10, 26/28 and 30/32, respectively). It is recommended to
connect load and supply to both female connector pins of
each path in order to keep the voltage drop across the con-
nector pins to an absolute minimum and to not overstress
the connector contacts if currents are higher than
approx. 8 A. The connector contacts are rated 8 A over the
whole temperature range.
Make sure that there is sufficient air flow available for con-
vection cooling. This should be verified by measuring the
case temperature when the unit is installed and operated in
the end-use application. The maximum specified case tem-
perature
T
C max shall not be exceeded. See also:
Thermal
Considerations.
If the end-product is to be UL certified, the temperature of
the main isolation transformer should be evaluated as part
of the end-product investigation.
Check for hazardous voltages before altering any connec-
tions.
Ensure that a unit failure (e.g. by an internal short-circuit)
does not result in a hazardous condition. See also:
Safety
of operator accessible output circuit.
Isolation
The electric strength test is performed as factory test in ac-
cordance with IEC/EN 60950 and UL 1950 and should not
be repeated in the field. Power-One will not honour any
guarantee claims resulting from electric strength field tests.
Important: Testing by applying AC voltages will result in
high and dangerous leakage currents flowing through
the Y-capacitors (see fig.:
Block diagram
).
Protection Degree
Condition: Female connector fitted to the unit.
IP 30: All units except those with option P, and except
those with option D or V with potentiometer.
IP 20: All units fitted with option P, or with option D or V with
potentiometer.
Cleaning Agents
In order to avoid possible damage, any penetration of
cleaning fluids is to be prevented, since the power supplies
are not hermetically sealed.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 19/26
Leakage Currents in AC-DC operation
Leakage currents flow due to internal leakage capacitance
and RFI suppression Y-capacitors. The current values are
proportional to the mains voltage and nearly proportional to
the mains frequency and are specified at an input voltage of
264 V (50 Hz) where phase, neutral and protective earth
are correctly connected as required for class I equipment.
Under test conditions the leakage current flows through a
measuring instrument (MI) as described in fig.:
Measuring
instrument for earth leakage current tests
, which takes into
account impedance and sensitivity of a person touching
unearthed accessible parts. The current value is calculated
by dividing the measured voltage by 500 Ω. If inputs and/or
outputs of K-units are connected in parallel, their individual
leakage currents are added.
Fig. 25
Measuring instrument (MI) for earth leaking current tests
according to IEC/EN 60950.
Fig. 26
Test set-up
V
MI
500 Ω
1500 Ω
10 kΩ220 nF
22 nF
10061
Vo+
Vo–
N
P10064
N
P
MI for
earth
leakage
current
Table 14: Leakage currents
Characteristic Class I Unit
LK 1000, LK 2000
Maximum earth Permissible according to IEC/EN 60950 3.5 mA
leakage current Specified value at 264 V, 50 Hz 1.43
Safety of operator accessible output circuit
If the output circuit of an AC-DC converter is operator ac-
cessible, it shall be an SELV circuit according to the IEC/EN
60950 related safety standards.
The following table shows a possible installation configura-
tion, compliance with which causes the output circuit of an
K series AC-DC converter to be an SELV circuit according
to IEC/EN 60950 up to a configured output voltage (sum of
nominal voltages if in series or +/– configuration) of 36 V.
However, it is the sole responsibility of the installer to as-
sure the compliance with the relevant and applicable safety
regulations. More information is given in
Technical Informa-
tion:
Safety
.
If the K series AC-DC converters are used as DC-DC con-
verters, please refer to the data sheet
DC-DC converters
>
100 W: K series.
Table 15: Safety concept leading to an SELV output circuit
Conditions AC-DC converter Installation Result
Nominal voltage Grade of insulation Measures to achieve the resulting Safety status of the AC-DC
between input and output safety status of the output circuit converter output circuit
provided by the AC-DC converter
Mains Double or reinforced Earthed case 1 and installation SELV circuit
≤250 V AC according to the applicable standards
1 The earth connection has to be provided by the installer according to the relevant safety standards, e.g. IEC/EN 60950.
AC-DC
con-
verter
Mains SELV
Earth connection
+
–
~
~
10021
Fuse
Fuse
Fig. 27
Schematic safety concept. Use fuses and earth connec-
tion as per: Installation Instructions and table: Safety con-
cept leading to an SELV output circuit.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 20/26
Input Filter
Control
Converter
FET
C
i
R
I
R
S
Rectifier
PFC - Control
11001
Fig. 28
Option E block diagram
Precaution:
Subsequent switch-on cycles at start-up are limited to
max. 10 cycles during the first 20 seconds (cold unit) and
at continuing on/off (
T
C=95°C) max. 1 cycle every
8 sec.
15
I
i
[A]
10
5
0
–5
–10
–15
020 40 60 80
t [ms]
t
inr
LK type
U
i
= 230 V AC
P
o
= P
o nom
Capacitor C
i
fully charged
Normal operation
(FET fully conducting)
20
10065
Fig. 29
Inrush current with option E
-9 Extended Temperature Range
Option -9 extends the operational ambient temperature
range from –25...71°C (standard to –40...71°C. The power
supplies provide full nominal output power with convection
cooling. Option -9 excludes inrush current limitation by
NTC.
P Potentiometer
The potentiometer provides an output voltage adjustment
range of +10/–60% of
U
o nom and is accessible through a
hole in the front cover. This feature enables compensation
of voltage drops across the connector and wiring. Option P
is not recommended if units are connected in parallel.
Option P excludes the R-function. With double output units
both outputs are affected by the potentiometer setting (dou-
bling the voltage setting if the outputs are in series).
If the output voltages are increased above
U
o nom via R-in-
put control, option P setting, remote sensing or option T, the
output current(s) should be reduced accordingly so that
P
o nom is not exceeded.
E Inrush Current Limitation
The converters may be supplemented by an electronic cir-
cuit (option E, replacing the standard built-in NTC) to
achieve an enhanced inrush current limiting function.
Table 17: Inrush current characteristics with option E
Characteristics LK Unit
U
i = 230 V AC typ max
I
inr p Peak inrush current –21.7 A
t
inr Inrush current duration 35 50 ms
Description of Options
Table 16: Survey of options
Option Function of option Characteristic
–9 Extended operational ambient temperature range
T
A = –40...71°C
E Electronic inrush current limitation circuitry Active inrush current limitation
P 1 Potentiometer for fine adjustment of output voltage Adjustment range +10/-60% of
U
o nom, excludes R input
D 2Input and/or output undervoltage monitoring circuitry Safe data signal output (D0...DD)
V 2 3 Input and/or output undervoltage monitoring circuitry ACFAIL signal according to VME specifications (V0, V2, V3)
T Current sharing Interconnect T-pins if paralleling outputs (5 units max.)
B1/B2 Cooling plate Replaces standard heat sink, allowing direct chassis-mounting
1Function R excludes option P and vice versa
2Option D excludes option V and vice versa
3Only available if main output voltage
U
o1 = 5.1 V
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 21/26
D Undervoltage Monitor
The input and/or output undervoltage monitoring circuit op-
erates independently of the built-in input undervoltage lock-
out circuit. A logic "low" (JFET output) or "high" signal (NPN
output)
is generated at pin 20 as soon as one of the moni-
tored voltages drops below the preselected threshold level
U
t. The return for this signal is Vo1–. The D output recovers
when the monitored voltage(s) exceed(s)
U
t +
U
h. The
Table 18: Undervoltage monitor functions
Output type Monitoring Minimum adjustment range Typical hysteresis
U
h [% of
U
t]
JFET NPN
U
i
U
o1 of threshold level
U
tfor
U
t min...
U
t max
U
ti
U
to
U
hi
U
ho
D1 D5 no yes - 3.5...40 V 1 - 2.5...0.6
D2 D6 yes no
U
i min...
U
i max 1 - 3.4...0.4 -
D3 D7 yes yes
U
i min...
U
i max 1 (0.95...0.985
U
o1) 2 3.4...0.4 "0"
D4 D8 no yes - (0.95...0.985
U
o1) 2 - "0"
D0 D9 no yes - 3.5...40 V 3 - 2.5...0.6
yes no
U
i min...
U
i max 3 4 - 3.4...0.4 -
yes yes
U
i min...
U
i max 3 4 3.5...40 V 3 3.4...0.4 2.5...0.6
yes yes
U
i min...
U
i max 3 4 (0.95...0.985
U
o1) 2 3.4...0.4 "0"
- DD yes yes
U
i min...
U
i max 1 3.5...40 V 1 3.4...0.4 2.5...0.6
1Threshold level adjustable by potentiometer
2Fixed value. Tracking if
U
01 is adjusted via R-input, option P or sense lines.
3The threshold level permanently adjusted according to customer specification ±2% at 25°C. Any value within the specified range is
basically possible but causes a special type designation in addition to the standard option designations (D0/D9 respectively)!
4Adjusted at
I
o nom
threshold level
U
ti is adjusted in the factory. The threshold
level
U
to is either adjusted by a potentiometer, accessible
through a hole in the front cover, or factory adjusted to a
fixed value specified by the customer.
Option D exists in various versions D0...DD as shown in the
following table.
Fig. 30
Paralleling of single output units using option T with the
sense lines connected at the load
1Leads should have equal length and cross sections and should
run in the same cable loom.
2Diodes recommended in redundant operation only
3DC common point
Vo+
Vo–
Vo+
Vo–
Load
Vo+
Vo–
11003
T Current Sharing
This option ensures that the output currents are approxi-
mately shared between all paralleled modules and in-
creases system reliability. To use this facility, simply inter-
connect the T pins of all modules and make sure, that
pins 14, the S– pin (LK 1000) or the Vo1– pins (LK 2000)
are also connected together. The load leads should have
equal length and cross section to ensure equal voltage
drops. Not more than 5 units should be connected in paral-
lel. If output voltage adjustment is requested we strongly
recommend to use the R-input instead of option P, as with
option P the required setting accuracy is difficult to achieve.
Fig. 31
An example of poor wiring for connection in parallel
Load
1
1
1
2
2
3
3
S+
Vo+
Vo–
S–
N
P
T
N
P
S+
Vo+
Vo–
S–
T
1
max. 5 units connected in parallel
11004
Fig. 32
Paralleling of double output units using option T with
Power bus.
Load
max. 5 units in parallel connection
+–
Power bus
Module
Vo2–
Vo2+
Vo1–
Vo1+
T
Module
Vo2–
Vo2+
Vo1–
Vo1+
T
11037
The output voltages must be individually set prior to paral-
leling to within a tolerance of 1...2% or the R pins should be
connected together.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 22/26
Vo1+
Vo1–
D
U
D
I
D
R
p
Input
11007
NPN output (D5...DD):
Connector pin D is internally connected via the collector-
emitter path of a NPN transistor to the negative potential of
output 1.
U
D < 0.4 V (logic low) corresponds to a monitored
voltage level (
U
i and/or
U
o1) >
U
t +
U
h. The current
I
D
through the open collector should not exceed 20 mA. The
NPN output is not protected against external overvoltages.
U
D should not exceed 40 V.
U
i,
U
o1 status D output,
U
D
U
i or
U
o1 <
U
thigh, H,
I
D ≤ 25 µA at
U
D = 40 V
U
i and
U
o1 >
U
t +
U
hlow, L,
U
D ≤ 0.4 V at
I
D = 20 mA
Vo1+
Vo1–
D
U
D
I
D
R
p
Input
11006
Fig. 33
Option D0...D4: JFET output, I
D
≤
2.5 mA
JFET output (D0…D4):
Connector pin D is internally connected via the drain-
source path of a JFET (self-conducting type) to the negative
potential of output 1.
U
D ≤ 0.4 V (logic low) corresponds to a
monitored voltage level (
U
i and/or
U
o1) <
U
t. The current
I
D
through the JFET should not exceed 2.5 mA. The JFET is
protected by a 0.5 W Zener diode of 8.2 V against external
overvoltages.
U
i,
U
o1 status D output,
U
D
U
i or
U
o1 <
U
tlow, L,
U
D ≤ 0.4 V at
I
D = 2.5 mA
U
i and
U
o1 >
U
t +
U
hhigh, H,
I
D ≤ 25 µA at
U
D = 5.25 V
Fig. 34
Option D5...DD: NPN output, U
o1
≤
40 V, I
D
≤
20 mA
Threshold tolerances and hysteresis:
If
U
i is monitored, the internal input voltage after the input
filter and rectifier is measured. Consequently this voltage
differs from the voltage at the connector pins by the voltage
drop ∆
U
ti across input filter and rectifier. The threshold lev-
els of the D0 and D9 options are factory adjusted at nomi-
nal output current
I
o nom and at
T
A = 25°C. The value of ∆
U
ti
depends upon the threshold level
U
t, temperature and input
current. The input current is a function of the input voltage
and the output power.
Fig. 35
Definition of U
ti, D
U
ti
and
D
U
hi
(JFET output)
Table 19: D-output logic signals
Version of D
U
i <
U
t resp.
U
o <
U
t
U
i >
U
t +
U
h resp.
U
o >
U
tConfiguration
D1, D2, D3, D4, D0 low high JFET
D5, D6, D7, D8, D9, DD high low NPN
D
U
ti
U
hi
U
D low
U
D
U
D high
U
i
P
o
=
P
o nom
P
o
= 0
P
o
= 0
U
ti
P
o
=
P
o nom
11021
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 23/26
D-signal with respect to input and output voltage versus time:
1Hold-up time see section Electrical Input Data.
2With output voltage monitoring, hold-up time
t
h = 0.
3The signal will remain high if the D output is connected to
an external source.
4
t
low min = 100...170 ms, typically 130 ms.
Fig. 36
Relationship between U
i
, U
o1
, U
D
, U
o1
/U
o nom
versus time
0
1
0.95
0
U
i
[V DC]
0
t
t
t
t
low min4
t
low min4
t
high min
t
h1
U
ti
+
U
hi
U
ti
Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent
input voltage failure
U
D high
U
D low
U
D
0
JFET
NPN
t
U
o1
U
o1 nom
U
D high
U
D low
U
D
t
low min4
t
h1
0
0
U
D high
U
D low
U
D
0
JFET
NPN
U
o1
U
D high
U
D low
U
D
t
low min4
U
to
3
Output voltage failure
0
I
D high
I
D low
I
D
t
0
I
D high
I
D low
I
D
t
t
t
t
3
2
33 33
U
o1 nom
U
to
+
U
ho
Input voltage monitoring
Output voltage monitoring
11008
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 24/26
Formula for threshold level for desired value of
t
h:
2 •
P
o • (
t
h + 0.3 ms) • 100
U
ti = ––––––––––––––––––––– +
U
i min2
C
i min • h
where as:
C
i min = internal input capacitance [mF]
P
o= output power [W]
h= efficiency [%]
t
h= hold-up time [ms]
U
i min = minimum input voltage [V] 1
U
ti = threshold level [V]
1Min. input voltage according to
Electrical Input Data
. For output
voltages
U
o >
U
o nom, the minimum input voltage increases pro-
portionally to
U
o/
U
o nom.
Remarks:
Option V2 and V3 can be adjusted by potentiometer to a
threshold level between
U
i min and
U
i max.
Option V operates independently of the built-in input under-
voltage lock-out circuit. A logic "low" signal is generated at
pin 20 as soon as one of the monitored voltages drops be-
low the preselected threshold level
U
t. The return for this
signal is Vo1–. The V output recovers when the monitored
voltage(s) exceed(s)
U
t +
U
h. The threshold level
U
t is either
adjustable by potentiometer, accessible through a hole in
the front cover, or is adjusted during manufacture to a de-
termined customer specified value.
Versions V0, V2 and V3 are available as shown below.
Table 20: Available internal input capacitance and factory
potentiometer setting of U
t i
with resulting hold-up time
Types LK Unit
C
i min 0.21 mF
U
ti 120 V DC
t
h4.2 ms
Table 21: Undervoltage monitor functions
V output Monitoring Minimum adjustment range Typical hysteresis
U
h [% of
U
t]
(VME compatible)
U
i
U
o1 of threshold level for
U
t min…
U
t max
U
ti
U
to
U
hi
U
ho
V2 yes no
U
i min...
U
i max 1 –3.4...0.4 –
V3 yes yes
U
i min...
U
i max 1 0.95...0.985
U
o1 2 3.4...0.4 "0"
V0 yes no
U
i min...
U
i max 3 4 –3.4...0.4 –
yes yes
U
i min...
U
i max 3 4 0.95...0.985
U
o1 2 3.4...0.4 "0"
1Threshold level adjustable by potentiometer.
2Fixed value between 95% and 98.5% of
U
o1 (tracking).
3 Adjusted at
I
o nom.
4Fixed value, resistor-adjusted (±2% at 25°C) acc. to customer's specifications; individual type number is determined by Power-One.
V output (V0, V2, V3):
Connector pin V is internally connected to the open collec-
tor of a NPN transistor. The emitter is connected to the
negative potential of output 1.
U
V ≤ 0.6 V (logic low) corre-
sponds to a monitored voltage level (
U
i and/or
U
o1) <
U
t.
The current
I
V through the open collector should not exceed
50 mA. The NPN output is not protected against external
overvoltages.
U
V should not exceed 60 V.
U
i,
U
o1 status V output,
U
V
U
i or
U
o1 <
U
tlow, L,
U
V ≤ 0.6 V at
I
V = 50 mA
U
i and
U
o1 >
U
t +
U
hhigh, H,
I
V ≤ 25 µA at
U
V = 5.1 V
Vo1+
Vo1–
V
U
V
I
V
R
p
Input
11009
Fig. 37
Output configuration of options V0, V2 and V3
V ACFAIL signal (VME)
Available for units with
U
o1 = 5.1 V
This option defines an undervoltage monitoring circuit for
the input or input and main output voltage equivalent to op-
tion D and generates an ACFAIL signal (V signal) which
conforms to the VME standard.
The low state level of the ACFAIL signal is specified at a
sink current of
I
V ≤ 48 mA to
U
V ≤ 0.6 V (open-collector out-
put of a NPN transistor). The pull-up resistor feeding the
open-collector output should be placed on the VME back
plane.
After the ACFAIL signal has gone low, the VME standard
requires a hold-up time
t
h of at least 4 ms before the 5.1 V
output drops to 4.875 V when the output is fully loaded. This
hold-up time
t
h is provided by the internal input capacitance.
Consequently the working input voltage and the threshold
level
U
ti should be adequately above the minimum input
voltage
U
i min of the converter so that enough energy is re-
maining in the input capacitance.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 25/26
3
5.1 V
4.875 V
0
U
i
[V DC]
0
t
t
U
ti
+
U
hi
U
ti
Input voltage failure Switch-on cycle Input voltage sag Switch-on cycle and subsequent
input voltage failure
U
V high
U
V low
U
V
0
V2
t
U
o1
0
U
V high
U
V low
U
V
0
V2
U
i
U
ti
4
Output voltage failure
0
U
V high
U
V low
U
V
3
U
ti
+
U
hi
t
low min 2
t
low min 2
t
low min 2
33
4
4
U
V high
U
V low
U
V
0
V3
t
3
t
low min 2
t
low min 2
33
t
h 1
2.0 V
t
h 1
4
3
4
t
low min 2
V3
5.1 V
4.875 V
0
U
o1
2.0 V
Input voltage monitoring
Output voltage monitoring
11010
t
t
t
t
Threshold tolerances and hysteresis:
If
U
i is monitored, the internal input voltage is measured af-
ter the input filter and rectifier. Consequently this voltage
differs from the voltage at the connector pins by the voltage
drop D
U
ti across input filter and rectifier. The threshold level
of option V0 is adjusted during manufacture at
I
o nom and
T
A
= 25°C. The value of D
U
ti depends upon the threshold level
U
t, temperature and input current. The input current is a
function of input voltage and output power.
1VME request: minimum 4 ms
2
t
low min = 40...200 ms, typically 80 ms
3
U
V level not defined at
U
o1 < 2.0 V
4The V signal drops simultaneously with the output voltage. If the
pull-up resistor
R
P is connected to Vo1+. The V signal remains
high if
R
P is connected to an external source.
D
U
ti
U
hi
U
V low
U
V
U
V high
U
i
P
o
=
P
o nom
P
o
= 0
P
o
= 0
U
ti
P
o
=
P
o nom
11023
Fig. 38
Definition of U
ti
,
D
U
ti
and U
hi
Fig. 39
Relationship between U
i
, U
o1
, U
V
, I
V
and U
o1
/U
o nom
ver-
sus time.
Cassette Style AC-DC Converters K Series
Edition 5/5.2000 26/26
Accessories
A variety of electrical and mechanical accessories are
available including:
–Front panels for 19" rack mounting, Schroff and Intermas
systems.
–Mating H15 and H15 S4 connectors with screw, solder,
fast-on or press-fit terminals.
–Connector retention facilities.
–Code key system for connector coding.
–Chassis mounting plates for mounting the 19" cassette to
a chassis/wall where only frontal access is given.
–Universal mounting bracket for DIN-rail or chassis moun-
ting.
For more detailed information please refer to:
Accessory
Products
.
H15/H15 S4 female connector,
Code key system
Front panels
Mounting plate,
Connector retention clips
Universal mounting bracket for DIN-rail mounting.
B1 Cooling Plate (
see: Mechanical Data
)
Where a cooling surface is available, we recommend the
use of a cooling plate (option B1) instead of the standard
heatsink. The mounting system should ensure sufficient
cooling capacity to guarantee that the maximum case tem-
perature
T
C max is not exceeded. The cooling capacity is cal-
culated by:
(100% –
h)
P
Loss = –––––––––– (
U
o •
I
o)
h
Efficiency h
see:
Type Survey.
Elongated case for 220 mm rack depth: Option B2.
