General specifications
Power supply
RGH24
5 V ± 5% 120 mA
RGH25+RGB25
(system)
5 V ± 5% 200 mA
RGH25UHV
(readhead only)
5 V ± 5% 50 mA
NOTE: For digital outputs, current consumption figures
refer to unterminated readheads/interfaces.
A further 25 mA per channel pair (eg A+, A-) will be
drawn when terminated with 120
Ω
.
Renishaw encoder systems must be powered from a
5 V dc supply complying with the requirements for
SELV of standard EN (IEC) 60950.
Ripple
200 mVpp
maximum@ frequency up to 500 kHz maximum
Bake-out temperature
120 °C (RGH25UHV only)
Sealing
(readhead)
IP40
Acceleration
(readhead)
operating 500 m/s
2
BS EN 60068-2-7:1993
(IEC 68-2-7:1983)
Shock
(readhead)
non-operating
1000 m/s
2
, 6 ms, ½ sine BS EN 60068-2-27:1993
(IEC 68-2-27:1987)
Vibration
(readhead)
operating
100 m/s
2
, 55 Hz to 2000 Hz BS EN 60068-2-6:1996
(IEC 68-2-6:1995)
Mass
RGH24: 11 g RGH25: 9 g
RGB25 interface: 95 g
Cable: standard 34 g/m UHV 23 g/m
Cable
Standard
Double shielded, maximum outside diameter 4.4 mm.
Flex life >20 x 10
6
cycles at 20 mm bend radius.
UHV
Single tinned copper braided shield over PTFE
insulated cores.
NOTE: standard 15 pin ‘D’ type connector fitted is
not vacuum compatible.
The RGH24/25 series readheads have been designed to the relevant EMC standards, but
must be correctly integrated to achieve EMC compliance. In particular, attention to shielding
arrangements is critical. Renishaw recommends the use of a double screened cable to
connect RGH24 JST as used in the cable variants of the RGH24/25.
NOTE: Class 1M LED product. LED radiation. Do not view directly with optical instruments.
Electrical connections
RGH24 grounding and shielding
RGH24
Customer
electronics
Extension cable*
Inner shield
Outer shield
Output
signals
0 V
5 V
*Maximum extension cable length:
RGH24B -100 m, RGH24D, X, Z - 50 m, RGH24C-30 m, RGH24W, Y, H, I, O -20 m
120R
A B Z E Q-
Customer
electronics
Cable Z
0
= 120R
5V
1k
#
1k
#
0 V
Readhead/interface
A B Z E Q+
RGH25 and RGB25 grounding and shielding
Remote LED driver outputs
The output of the integral set-up LED
is available from the JST connector
versions only to allow remote
monitoring of readhead installation.
Green
Red
Red/Green
LED
150R
+
–
RGH25
RGB25
Customer
electronics
Inner shield
(except UHV)
Outer shield
Output
signals
0 V
0 V power
5 V
Pin 15
Extension cable**
Recommended signal termination
Digital outputs - RGH24D, X, Z, W, Y, H, I, O - RGB25D, X, Z, Y, H
#
Only required on alarm channel E (not RGH24)
**Maximum extension cable length:
RGB25B-100 m, RGB25D, X, Z - 50 m, RGB25C-30 m, RGB25Y, H -20 m
V
0
V
1
V
2
-
V
0
V
1
V
2
+
Analogue outputs - RGH24B, RGB25B
120R
Green
Red