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Readhead mounting and alignment
Mounting brackets
The bracket must have a flat mounting surface, 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. For easier installation, adjust the roll and yaw of the bracket with respect to the axis of readhead
travel before the RGH24 is attached. This can be done with a clock gauge and a precision square.
Readhead set-up
To set nominal rideheight, position readhead spacer with 'L' shaped aperture under the optical centre of the
readhead to allow normal LED function during set-up procedure. Ensure that the scale, readhead optical
window and mounting face are clean and free from obstructions.
NOTE: Ensure readhead fixing screws are tightened to 0.5 Nm-0.7 Nm.
Yaw
0° ± 0.5°
Pitch
0° ± 1°
For reliable operation, the set-up LED should be GREEN when readhead is moved along the full axis travel.
The JST version of the RGH24 has an LED repeater signal that can be used in cases where the LED is not visible.
*
Remote LED will continuously flash Red when signal <20%
RGH24 RGS20 installation guide
Green Orange Red *
Roll
0° ± 1°
0.8 ± 0.1 mm
Rideheight
IMPORTANT: The RGH24 range does not incorporate a separate Alarm 'E' signal. Low signal is
indicated by a 3-state output of the line driver channels.
Reference mark set-up
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 repeatabilty is guaranteed only in the
phased direction.
Ensure readhead is set up correctly with a green LED indication over the full length of travel and
that the reference mark actuator is fitted correctly.
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, giving unit of
resolution pulse width.
Phasing procedure
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 by
1 8
turn and the procedure repeated
until a red flash is obtained.
†
Red Orange Blank
LED flash during reference mark traverse only
†
Remote LED will flash Green rather than blank.
Limit switch
A limit switch signal is output when the readhead sensor passes over the magnetic actuator.
NOTE: RGH24 readheads are available with reference mark or limit switch detection.
Select output at order.
NOTE: Limit switch output is not available with analogue RGH24, or options 60, 61 and 62 of
the digital RGH24.
6
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