Renishaw RCU10, Installation And User Manual, Page: 20 / 202

System overview 1-9
1.5 System components
The following provides a brief overview of the main system components:
Compensation unit with internal air pressure sensor
(part number: RCU10-PX-XX)
Powered from 24 V dc, the RCU10-PX-XX contains the
digital signal processor based compensation electronics and
an internal air pressure sensor. For applications that use a
laser encoder and require refractive index compensation, the
RCU10-PX-XX unit is a requirement. In multi-axis
applications, only one RCU10-PX-XX is necessary because
compensation for additional axes is provided by
RCU10-XX-XX units (detailed below). In these applications,
the pressure sensor reading is distributed to other RCU10s in
the network via a high-speed serial link.
Compensation unit (part number: RCU10-XX-XX)
Similar to the RCU10-PX-XX, however this assembly does
not contain a pressure sensor.
Note that one RCU10 compensation unit is required for each
axis to be compensated. For example, a three-axis laser
encoder based system would need:
1 off RCU10-PX-XX
2 off RCU10-XX-XX
and a three-axis tape or glass scale encoder system would
need:
3 off RCU10-XX-XX
Air temperature sensor (part number: RCU10-AT-XX)
The air temperature sensor is used in applications that
require refractive index compensation. The sensor contains a
calibrated thermistor to monitor ambient air temperature in
the range of 0 °C to 40 °C. The temperature reading is
converted into a digital signal inside the sensor, which
reduces susceptibility to noise when the reading is
transmitted to the RCU10.