DATA SHEET
RGH26 series - serial communications
readhead system
L-9517-9106-01-A
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·Non-contact open optical system
·Integral interpolation
·Mitsubishi compatible serial
communications
·Maximum speed up to 6m/s
·Resolutions from 5µm to 0.5µm
·Integral reference and dual limit sensors
·No interface required
·Integral set-up LED
·Uses RGS-S self adhesive scale
Serial communication (dual limit) range Compatible Mitsubishi products
RGH26P - 5µm resolution MELSERVO®-J2-Super series
RGH26Q - 1µm resolution
RGH26R - 0.5µm resolution
The RGH26 readheads are a new
addition to Renishaw’s proven RG2 range of
linear encoder systems. The RG2 range
consists of non-contact optical encoders
designed for precision position feedback
solutions. The system uses a reflective tape
scale scanned by a readhead chosen from a
range of options. It offers industry standard
digital square wave, analogue sinusoidal, and
now Mitsubishi-comp atible serial communication
signal formats. Renishaw’s patented filtering
optical scheme is used in all RG2 linear
encoders and gives outstanding performance
combined with a high tolerance to dust,
scratches and light oil contamination.
The RGH26 range has been specifically
designed for use with Mitsubishi’s
MELSERVO®-J2-Super series range of servo
amplifiers. The RGH26 range offers exceptional
high speeds of up to 6m/s with high
resolutions of up to 0.5µm.
Unlike other serial communication systems for
linear encoders, the RGH26 does not require a
separate bulky interface. Renishaw’s innovative
electronics design means that all of the
interpolation and serial conversion is contained
within the same compact body as the popular
RGH22. The incremental count takes place within
the readh ead, r es ult in g i n remark ab le s ys tem noise
immunity.
Dual limit sensors have been incorporated as
standard, offering two dedicated signal outputs, for
left and right end-of-axis travel indication. A
repeatable reference mark output is also included,
along de dicated real-t ime channels, as well as part
of the serial word.
The class-leading compact size, exceptional high
speed, high accuracy, and zero-friction
configuration make the RGH26 range the encoder
of choic e for linear fe edback app lications wher ever
a MELSERVO®-J2-Super is used.
Mounting face
Scale mounting surfac e
P limit switch
sensor position
P limit switch actuator
mount white dot to substrate
(size as Q act uator)
Q limit switch sensor position
2 holes M3x0.5
7.5 deep
Q limit switch actuator
mount white dot up
Alternative
mounting face
Extent of
mounting faces
Set-up LED
2 holes
M3x0.5
9.5 deep
Optica l centre
Reference mark sens or position
R50 dynamic bend radius
R10 static bend radius
Reference mark
actuator
7
14
14.5
6 Min
22
4
23.5
0.38
15.5
6
10.5
17
16
11.6 0.13
3
9
27
13
7.6
0.8±0.1
2
0.8
5
44
38
3
Ø4.7
2.2
10.6
10
3
14.6
14.6
Roll tol. ±1.0°
Yaw tol. ±0.5°
General outline and dimensi ons
Dimensions in mm
Arrow indic ates forward
directi on of readhead
relative to scale
Detail showing scale face
to readhead clearance
Pitch tol. ±1.0°
Operating and electrical specifications
Power supply 5V ±5% 230mA
Temperature Storage -20°C to +70°C
Operating 0°C to +55°C
Humidity 10 - 90% RH non-condensing
Sealing IP50
Acceleration operating 300m/s2
Shock (non-operating) 1000m/s2, 11ms, ½ sine
Vibration (operating) 100m/s2 55 to 2000Hz as per IEC 68-2-6
Mass Readhead 45g
Cable 38g/m
EMC compliance (system) BS EN 50081-2
BS EN 50082-2
BS EN 55011
Cable 12 core, double shield, outside dia. 4.7mm.
Flex life >10 x 106 cycles at 50mm bend radius
Connector N - 15 pin D type plug
Maximum speed RGH26P (5µm) 6.0m/s peak, 5.0m/s constant, 4.0m/s rated
(green LED at set-up) RGH26Q (1µm) 4.6m/s peak, 4.0m/s constant, 3.2m/s rated
RGH26R (0.5µm) 2.3m/s peak, 2.0m/s constant, 1.6m/s rated
Recommended signal termination
Channels LZ and LZR (Reference mark output) (cannot be connected directly to MELSERVO®-J2-Super)
* Optional power saving capacit or, for recom m ended val ues
see below:
Channels P and Q (Dual limit outputs) (cannot be connected directly to MELSERVO®-J2-Super)
Open collector output
P, Q
Cable length C
<25m 4n7F
>25m 10nF
Standard RS485 line transc ei ver circuitry
R
5V to 25V Select R so that the maxim um current does not
exceed 20mA. Alternati vely, a suitable relay or
opto-isol at or may be used.
Actuation device: RGP22S, RGP22SM or
RGP22SL
CONT (2-4 wire communications select)
For 2-wire communicati on, leave CONT floating
For 4-wire communicati on, connect CONT to 0V
Channels MD, MDR, MR, MRR
These channels shoul d be connected to the relevant input of the MELSERVO®-J2-Super
Readhead
120R
C*
Cable Zo = 120R
Customer
electronics
Model P(µm) S(µm)
RGH26P 20 5
RGH26Q 4 1
RGH26R 2 0.5
Data from RGH26
MR
Signal specifications
Channels LZ and LZR
Form Square wave differential line driver to EIA RS422 Synchronised pulse LZ and LZR occurs when A
is high. Repeatability of position (uni-directional)
maintained within ±10°C from installation
temperature and for speed <250mm/s.
Signals A and B are incremental signals that
occur inside the readhead. A and B are not
available as outputs.
Actuation device RGM22S.
Channels P and Q
Form Open collector output
Data from RGH26 The inverse of this signal is
transmit ted along MRR
MR
MD
MRR and MDR (the inverse
of MR and MD) have been
omitted for clar ity
IMPORTANT: A reference mark (RGM22S) must be fitted to the axis to enable the use of the RGH26.
Request from MELSERVO®
LZR
Signal period P
Resolution S
LZ
A
B
© 2001 Renishaw Issued 0601 Renishaw reserves the right to change specifications without notice Part no. L-9517-9106-01-A
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For all other countries
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email international@renishaw.com
P, Q
Repeatabil ity <0.1 mm ty pical
Length of actuating magnet
Operating voltage = 5V to 25V
Maximum current = 20mA
Actuation device: RGP22S, RGP22SM or
RGP22SL
2-wire serial communication (CONT left floating)
Form Square wave differential transmission/receiving to EIA RS485
Request from MELSERVO®
4-wire serial communication (CONT connected to 0V)
Form Square wave differential transmission/receiving to EIA RS485
