16
Features
1. Bright and Easy-to-Read Display
A brand new bright 2-color back-lit LCD
display. The screen is easy-to-read in
any location, makes checking and set-
ting procedures a cinch.
2. Simple Operation
Seesaw buttons make setting and oper-
ation simple and easy.
3. Short Body of only 64.5 mm 2.54
inch (screw terminal type) or 70.1 mm
2.76 inch (pin type)
With a short body, it is easy to install
even in shallow control panels.
4. Conforms to IP66’s Weather
Resistant Standards
The water-proof front panel keeps out
water and dirt for reliable operation even
in poor environments.
5. Screw terminal and Pin Type are
Both Standard
The two terminal types are standard to
support either through-panel installation
or embedded installation.
6. Changeable Panel Cover
A black panel cover is also available to
meet your design requirements.
7. Conforms With EMC and Low
Voltage Directives
Conforms with EMC directives
(EN50081-2/EN50082-2) and low-volt-
age directives (VDE0435/Part 2021) for
CE certification vital for use in Europe.
8. EE-PROM Power Failure Memory
EE-PROM memory retains setting and
time data. Eliminates the need for bat-
tery replacement.
Pin type Screw terminal type
Compact, Easy-to-read, Easy-to-use...
A digital timer made to meet the market’s needs.
Part names
UP
DOWN
RESET
LOCK
TIMER LT4H
OP.
RST
LOCK hms
Time delay indicator
Controlled output indicator
Reset indicator
Lock indicator
Reset switch
Lock switch
Elapsed time display
Set time display
Time units display
Up keys
Down keys
ON
12345678
DIP switches
(Same for screw terminal type)
Time range Operation mode Output Operation voltage Power down insurance Terminal Part No.
9.999 s (0.001 s~)
99.99 s (0.01 s~)
999.9 s (0.1 s~)
9999 s (1 s~)
99 m 59 s (1 s~)
999.9 min (0.1 m~)
99 h 59 min (1 m~)
999.9 h (0.1 h~)
Power ON delay (1)
Power ON delay (2)
Signal ON delay
Signal OFF delay
Pulse One-shot
Pulse ON-delay
Signal Flicker
Totalizing ON-delay
(8 modes)
Relay
(1 c)
Transistor
(1 a)
100-240 V AC
12-24 V DC
100-240 V AC
12-24 V DC
Available
11 pin
Screw
11 pin
Screw
11 pin
Screw
11 pin
Screw
LT4H-AC240V
LT4H-AC240VS
LT4H-DC24V
LT4H-DC24VS
LT4HT-AC240V
LT4HT-AC240VS
LT4HT-DC24V
LT4HT-DC24VS
Product types
DIN 48 SIZE
DIGITAL TIMER LT4H
Timers
17
Item Ralay output type
AC type
100 to 240 V AC
50/60 Hz common
Max. 10 V A 5 A, 250 V AC
9.999 s, 99.99 s, 999.9 s, 9999 s, 99 min 59 s, 999.9 min, 99 h 59 min, 999.9 h (selected by DIP switch)
Addition (UP)/Subtraction (DOWN)
(2 directions selectable by DIP switch)
A (Power ON delay), A2 (Power ON delay), B (Signal ON delay), C (Signal OFF delay), D (Pulse one-shot),
E (Self-hold), F (Flicker), G (Totalizing) (Selectable by DIP switch)
Min. input signal width: 1 ms, 20 ms (2 directions by selected by DIP switch)
Min. input signal width: 20 ms
Open collector input Input impedance: Max. 1 kΩ; Residual voltage: Max. 2 V
Open impedance: 100kΩor less, Max. energized voltage: 40V DC
7-segment LCD, Elapsed value (backlight red LED), Setting value (backlight yellow LED)
EE-PROM (Min. 105overwriting)
± (0.005 % + 50 ms) in case of power on start
± (0.005 % + 20 ms) in case of reset or input signal start
(at fixed power off time)
100 ms
Timed-out 1 Form C
100 mΩ(at 1 A 6 V DC)
Ag alloy/Au flash
2.0 ×107ope. (Except for switch operation parts)
1.0 ×105ope. (At rated control voltage)
85 to 110 % of rated operating voltage
2,000 Vrms for 1 min: Between live and dead metal parts
2,000 Vrms for 1 min: Between input and output
2,000 Vrms for 1 min: Between live and dead metal parts
2,000 Vrms for 1 min: Between input and output
1,000 Vrms for 1 min: Between contacts
Between live and dead metal parts
Min. 100 MΩ: Between input and output
Between contacts
Min. 100 MΩ: Between live and dead metal parts
Between input and output
Max. 0.5 s
10 to 55 Hz: 1 cycle/min single amplitude of 0.35 mm .014 inch (10 min on 3 axes)
10 to 55 Hz: 1 cycle/min single amplitude of 0.75 mm .030 inch (1 h on 3 axes)
Timed-out 1 Form A (Open collector)
—
—
—
1.0 ×107ope. (At rated control voltage)
12 to 24 V DC
—
Max. 3 W
100 to 240 V AC
50/60 Hz common
Max. 10 V A 100 mA, 30 V DC
12 to 24 V DC
—
Max. 3 W
DC type Transistor output type
AC type DC type
Rating
Time
accuracy
(max.)
Contact
Life
Electrical
Mechanical
Operating
conditions
Operating voltage
Frequency
Power consumption
Control capacity (resistive)
Time range
Time counting direction
Operation mode
Signal, Reset, Stop input
Lock input
Input signal
Indication
Power failure memory
method
Operating time fluctuation
Temperature error
Voltage error
Setting error
Power off time change
error
Contact arrangement
Initial contact resistance
Contact material
Mechanical
Electrical
Operating voltage range
Initial breakdown voltage
Initial insulation resistance
(At 500 V DC)
Operating voltage reset
time Max. 65° C (under the flow of nominal operating current at nominal voltage)
Temperature rise
Functional
Destructive
Vibration
resistance Min. 98 m 321.522 ft./s2(4 times on 3 axes)
Min. 294 m 964.567 ft./s2(5 times on 3 axes)
–10° C to 55° C +14° F to +131° F
Max. 85 % RH
860 to 1,060 h Pa
—11-pin/screw terminal
IP66 (front panel with rubber gasket)
20 % or less — 20 % or less
Functional
Destructive
Ambient temperature
Ambient humidity
Air pressure
Ripple rate
Connection
Protective construction
Shock
resistance
Specifications
18
Dimensions (units: mm inch)
• LT4H digital timer
Terminal layout and wiring
• Pin type
Relay output type Transistor output type Relay output type Transistor output type
• Screw-down terminal type
• Dimensions for through-panel installation (with adapter installed)
•
Dimensions for surface mount installations
•
Installation panel cut-out dimensions
The standard panel cut-out dimensions are shown
below. Use the installation frame (ATA4811) and rub-
ber gasket (ATC18002).
• For connected installations
Note 1: The installation panel thickness should be between 1
and 5 mm .039 and .197 inch.
Note 2: For connected installations, the waterproofing ability
between the unit and installation panel is lost.
UP
DOWN
RESET
LOCK
TIMER LT4H
s
OP.
48
1.890
48
1.890
5.5
.217 70.1
2.760
55.6
2.189
7.5
.295
(44.5
(1.752
(44.5
(1.752
5.5
.217 64.5
2.539
7.5
.295
Screw-down terminal type
(through-panel installation)
Screw-down terminal type Pin type
Pin type (through-panel or
surface mount installation)
UP
DOWN
RESET
LOCK
TIMER LT4H
OP
RST
LOCK h m s
,,
,,
,,
,,
,,
,
Installation frame
ATA4811 (supplied)
Installation panel
Rubber gasket
ATC18002 (supplied)
48
1.890
48
1.890
66
2.598
50
1.969
1
.039 63.5
2.500
(44.5
(1.752
,,
,,,
,,,
,,,
,,
DIN rail terminal block
ATC18004
(sold separately)
Device installation rail
ATA48011
(sold separately)
95.5
3.760
80 min.
3.150
80 min.
3.150
45-0.6
0
45-0.6
0
1.772-.024
0
1.772-.024
0
A
A = (48 × n – 2.5) –0.6
0
45-0.6
0
1.772-.024
0
1
2
345678
9
10
11
Reset
Signal
Stop
Lock
COM
NC
NO
Operation voltage (+)(–)
1
2
345678
9
10
11
Reset
Signal
Stop
Lock
Operation voltage (+)(–)
1 2 3 4 5
6 7 8 9 10
NO NC
COM
Reset
Signal
Stop
Lock
Operation voltage
(–)(+)
1 2 3 4 5
67 8 9 10
Reset
Signal
Stop
Lock
Operation voltage
(–)(+)
19
Setting the operation mode, timer range, and time
Setting procedure 1) Setting the operation mode and timer range
Set the operation mode and timer range with the DIP switches on the side of the unit.
DIP switches
Setting procedure 2) Setting the time
Set the set time with the keys on the front of the unit.
Front display section
DIP switch
Item DIP switch No.
1 2 3
ON ON ON A: Power on delay
OFF OFF OFF A2: Power on delay
ON OFF OFF B: Signal on delay
OFF ON OFF C: Signal off delay
ON ON OFF D: Pulse One shot
OFF OFF ON E: Pulse On delay
ON OFF ON F: Signal Flicker
OFF ON ON G: Totalizing On delay
Table 1: Setting the operation mode
Table 2: Setting the timer range
Operation mode
Operation mode Refer to table 1
1
2
3Minimum input reset, signal, and
stop signal width 20 ms 1 ms
4
Time delay direction Addition
Subtraction
5
Timer range Refer to table 2
6
7
8
ONOFF
DIP switch No.
6 7 8
ON ON ON 0.001 s to 9.999 s
OFF OFF OFF 0.01 s to 99.99 s
ON OFF OFF 0.1 s to 999.9 s
OFF ON OFF 1 s to 9999 s
ON ON OFF 0 min 01 s to 99 min 59 s
OFF OFF ON 0.1 min to 999.9 min
ON OFF ON 0 h 01 min to 99 h 59 min
OFF ON ON 0.1 h to 999.9 h
Timer range
ON
1 2 3 4 5 6 7 8
DIP switches
(Same for screw-down terminal type)
QElapsed time display
WSet time display
ETime delay indicator
RControlled output indicator
TReset indicator
YLock indicator
UTime units display
IUP keys
Changes the corresponding digit of
the set time in the addition direc-
tion (upwards)
ODOWN keys
Changes the corresponding digit of
the set time in the subtraction
direction (downwards)
PRESET switch
Resets the elapsed time and the
output
{LOCK switch
Locks the operation of all keys on
the unit
UP
DOWN
RESET
LOCK
TIMER LT4H
OP
RST
LOCK h m s
1
3
4
5
6
10
11
2
7
8
9
• Changing the set time
1. It is possible to change the set time
with the up and down keys even dur-
ing time delay with the timer.
However, be aware of the following
points.
1) If the set time is changed to less than
the elapsed time with the time delay set
to the addition direction, time delay will
continue until the elapsed time reaches
full scale, returns to zero, and then
reaches the new set time. If the set time
is changed to a time above the elapsed
time, the time delay will continue until
the elapsed time reaches the new set
time.
2) If the time delay is set to the subtrac-
tion direction, time delay will continue
until “0” regardless of the new set time.
2. If the set time is changed to “0,”
the unit will operate differently
depending on the operation mode.
1) If the operation mode is set to A
(power on delay) or A2 (power on delay),
the output will turn on when the power
supply is turned on. However, the output
will be off while reset is being input.
2) In the other modes, the output turns
on when the signal is input. When the
operation mode is C (signal off delay), D
(one shot), or F (flicker), only when the
signal input is on does the output turn
on. Also, when the reset is being input,
the output is off.
Note: Set the DIP switches before installing the unit.
20
Operation mode T: Set time t1, t2, t3, ta<T
Operation type
Power on delay (1)
Explanation Time chart
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value and starts time
delay at power ON.
• After time-out, stops at the display of the set
value (addition), or stops at “0” (subtraction).
• Ignores signal input.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
A
Power on delay (2)
A2
Signal on delay
B
Signal off delay
C
Stop
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
T t1 t2 t1+t2=T
OFF
ON
OFF
ON
OFF
ON
OFF
ON
T t1 t2 t1+t2=T
Stop
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tt1 t2 t1+t2=T
Stop
Signal
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tta tb t
T>ta+tb T>t
Stop
Signal
Reset
Output
Power supply
1 2 3
ON ON ON
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Elapsed time value does not clear at power
ON. (power outage countermeasure function)
• The output remains ON even after the power
is cut and restarted.
• After time-out, stops at the display of the set
value (addition), or stops at “0” (subtraction).
• Ignores signal input.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
1 2 3
OFF OFF OFF
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts at signal ON and elapsed
time value or output resets at signal OFF.
• Instantaneous time delay start at reset OFF
and power ON while signal is ON.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
• In order to have the time delay start at power
ON or reset at power OFF, jumper the signal
input beforehand.
1 2 3
ON OFF OFF
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Output control ON at signal ON and time
delay start at signal OFF.
• Elapsed time value clears when signal goes
ON again during time delay.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
1 2 3
OFF ON OFF
21
Operation type
Pulse One-Shot
Explanation Time chart
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts and output control ON at
signal ON.
• Ignores signal input during time delay.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
D
Pulse On delay
E
Signal Flicker
F
Totalizing On delay
G
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
T T t1 t2
ta
T=t1+t2
T>ta
t
Stop
Signal
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
T t2
T=t1+t2
T Tt1
Stop
Signal
Reset
Output
Power supply
T>ta
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
t1 t1
T=t1+t2 T=t1+t2
tat2 t2
T
T T
Stop
Signal
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tt1 t2 t3 ta
T=t1+t2+t3 T>ta
Stop
Signal
Reset
Output
Power supply
1 2 3
ON ON OFF
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts at signal ON.
• Ignores signal input during time delay.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
• In order to have the time delay start at power
ON or reset at power OFF, jumper the signal
input beforehand.
1 2 3
OFF OFF ON
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts at signal ON.
• Ignores signal input during time delay.
• Output control reverses, elapsed time value
clears, and timer delay starts at timer comple-
tion.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
• In order to have the time delay start at power
ON or reset at power OFF, jumper the signal
input beforehand.
1 2 3
ON OFF ON
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Elapsed time value does not clear at power
ON. (power outage countermeasure function)
• The output remains ON even after the power
is cut and restarted.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
1 2 3
OFF ON ON
22
MOUNTING PARTS
•Rubber gasket
ATC18002
ACCESSORIES
• Panel cover (Black)
ATL58011
50.0
1.969 1.0
.039
50.0
1.969