Reference Mark And Limit Switch Actuator Installation; Readhead Mounting And Alignment - Renishaw RGH22 Installation Manual

Reference mark and limit switch actuator installation

To aid location of reference mark and limit switches,
the orange shim should be used as shown.
Reference mark and limit switch actuators can be
mounted independently from each other,
but within the limits specified by the
relevant installation drawing.
Ensure that excess glue does not enter the reference mark actuator adjustment mechanism.
Limit switch actuators
There are several different size limit switch actuators available:
A-9531-2052
A-9531-0251
24.4 mm limit switch
10 mm limit switch
actuator
actuator
Single limit switches
For single limit switch detection, limit switch actuator should be mounted with the dimple uppermost.
Dual limit switches
Some versions of the RGH22 are configured to detect dual limit switch actuators.
NOTE: Refer to RGH22 installation drawing for limit switch actuator positioning.
Reference mark actuators
Reference marks provide a repeatable 'datum position' for the readhead.
Actuators are available in either bolted or glued formats (see below)
A-9531-0250
Epoxy-mounted
reference mark actuator
RGH22 RGS20 installation guide
Limit switch actuator
Reference mark actuator
A-9531-2054
50 mm limit switch
actuator
A-9531-0287
Screw-mounted
reference mark actuator

Readhead mounting and alignment

Mounting brackets
The bracket must have a flat mounting surface and should provide adjustment to enable conformance to the
installation tolerances, allow adjustment to the rideheight of the readhead, and be sufficiently stiff to prevent
deflection or vibration of the readhead during operation.
Readhead set-up
Ensure that the scale, readhead optical window and mounting face are clean and free from obstructions.
To set nominal rideheight, place the blue or orange spacer with the aperture directly under the optical
centre of the readhead to allow normal LED function during set-up procedure. The orange spacer also
helps to position readhead with respect to offset and yaw relative to the scale
NOTE: Ensure readhead fixing screws are tightened to 0.5 Nm - 0.7 Nm.
Adjust the readhead to achieve a solid Green LED. When correctly installed the set-up LED remains Green
along the full axis of travel.
An external set-up signal (X or V ) is also available on RGH22 readheads for use where the LED is not
X
visible. In this case, 5 V indicates optimum set-up,
while a 0 V signal indicates that the
set-up should be adjusted.
Roll
0° ± 1°
Pitch
0° ± 1°
Green Orange Red
Yaw
0° ± 0.5°
orange spacer
or
blue spacer
0.8 ± 0.1 mm
Rideheight
6