Renishaw RGH22, Installation Manual

Page: 14 / 15

12 RGH22 RGS20 installation guide
General specifications
Power supply 5 V ± 5% 120 mA (typical), 200 mA RGH22Y, S and H
NOTE: Current consumption figures refer to unterminated readheads.
For digital outputs a further 25 mA per channel pair (e.g. A+, A-) will
be drawn when terminated with 120
Ω
.
For analogue outputs a further 20 mA will be drawn when terminated
with 120
Ω
.
Power from a 5 V dc supply complying with the requirements for SELV
of standard IEC BS EN 60950-1.
Ripple 200 mVpp@frequency up to 500 kHz maximum.
Temperature
Storage −20 °C to +70 °C
Operating 0 °C to +55 °C
Humidity 95% relative humidity (non-condensing) to EN 60068-2-78
Sealing IP50
Acceleration Operating 500 m/s
2
, 3 axes
Shock
Non-operating 1000 m/s 2 , 6 ms, ½ sine, 3 axes
Vibration Operating 100 m/s
2
max @ 55 Hz to 2000 Hz, 3 axes
Mass Readhead 45 g
Cable 38 g/m
Cable 12 core, double shielded, maximum diameter 4.7 mm.
Flex life >20 x 10
6
cycles at 50 mm bend radius.
Renishaw encoder systems have been designed to the relevant EMC standards, but must be correctly
integrated to achieve EMC compliance. In particular, attention to shielding arrangements is essential.
Scale specifications
Scale type RGS20-S Reflective gold plated steel tape with protective lacquer coating.
Adhesive backing tape allows direct mounting to the machine substrate.
RGS20-P Reflective gold plated steel tape with tough polyester coating for
applications using harsh solvents.
Adhesive backing tape allows direct mounting to the machine substrate.
Scale period 20 µm
Linearity RGS20-S ±3 µm/m
RGS20-P ±5 µm/m
Scale length Up to 50 m (>50 m by special order)
Form
(H x W)
RGS20-S 0.2 mm x 6 mm (includes adhesive)
RGS20-P 0.3 mm x 6.3 mm (includes adhesive)
Substrate materials
Metals, ceramics and composites with expansion coefficients
between 0 and 22 µm/m/°C
(steel, aluminium, Invar, granite, ceramic etc.)
Coefficient of thermal expansion Matches that of substrate material when scale ends are fixed by
epoxy mounted end clamps
End fixing Epoxy mounted end clamps (A-9523-4015) using 2 part epoxy
adhesive (A-9531-0342)
Scale end movement <1 µm over temperature range
− 20 °C to +50 °C
Temperature Operating −10 °C to +120 °C.
Minimum installation 10 °C
Storage −20 °C to +70 °C.
Humidity
95% relative humidity (non-condensing) to EN 60068-2-78