Reference Mark Phasing; Limit Switch - Renishaw RGH25F Installation Manual

Readhead installation
(continued)
Pitch
0° ± 1°
For reliable operation, the SET UP LED should be at least Green, ideally blue or purple when
readhead is moved along the full axis travel.

Limit switch

A limit switch signal is output when the readhead sensor passes over the magnetic actuator.
For full output specification refer to RGH25F Data sheet (L-9517-9113).
Yaw
0° ± 0.5°
Green Orange Red
Blue
Purple
Roll
0° ± 1°
SET UP LED colour, except
at reference mark position.
0.8 ± 0.1 mm
Rideheight

Reference mark phasing

To ensure unidirectional repeatability, the reference mark requires phasing with the scale in
the direction of normal datuming operation.
A reference pulse is output in both directions, but repeatability is guaranteed only in the
phased direction.
Ensure system is installed and calibrated correctly and that the reference mark actuator is fitted as
shown in the installation drawing.
The readhead must be moved over the reference mark in the direction to be used for the datuming
operation. The reference mark is phased correctly when the SET UP LED flashes red for 0.25 seconds.
If it flashes orange or goes blank, the reference mark adjuster screw should be turned anti-clockwise
1 8
by turn and the procedure repeated until a red flash is obtained.
NOTE: It is recommended that a datum procedure is performed as part of any power-up sequence
to ensure the correct datum position is recorded.
NOTE: Reference mark output is synchronised
with the incremental channels.
For further details see RGH25F Data sheet
(L-9517-9113).
SET UP LED colour at
reference mark position only.
NOTE: Reference mark flashes only
occur up to 100 mm/s traverse speed.
1
turn
8
Red Orange Blank