Readhead Mounting And Alignment - Renishaw VIONiC REXM20 Installation Manual

Readhead mounting and alignment

Mounting brackets
The bracket must have a flat mounting surface and should 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.
NOTES:
X Ensure the protective film is removed from the ring before installing the readhead.
X When cleaning readhead and scale apply cleaning fluid sparingly; do not soak.
To set nominal rideheight, place the green spacer with the aperture under the optical centre of the readhead
to allow normal LED function during set‑up procedure. Adjust the readhead to achieve a flashing Green LED
for a complete rotation. The faster the flash rate, the closer it is to optimum set‑up. The optional Advanced
Diagnostic Tool ADTi-100 (A-6195-0100) and ADT View software can be used to optimise signal strength in
www.renishaw.com/adt
challenging installations. See
NOTE: When re-installing the readhead factory defaults should be restored
Green spacer
Pitch
0° ±1°
Optical centreline
VIONiC REXM20/REXT20 installation guide
for more details.
(page 12).
Readhead set-up LED status
Yaw
0° ±0.4°
Green Orange
flashing flashing
Roll
0° ±0.5°
Rideheight
2.1 ±0.15 mm
Readhead LED diagnostics
Mode LED
Installation mode Green flashing
Orange flashing
Red flashing
Calibration mode Blue single flashing
Blue double flashing
Normal operation Blue
Green
Red
Blank flash
Alarm 4 red flashes
Reference mark position
Red
flashing
REXM20
IN-TRAC ™ reference mark is integrated in the scale, radially aligned with the centre of the mounting hole to
the left of the 'Renishaw' logo within ±0.5 mm. No external actuator or physical adjustment is required.
REXT20
The second reference mark is 180° from the first.
Status
Good set‑up, maximise flash rate for optimum set‑up
Poor set‑up, adjust readhead to obtain Green flashing LED
Poor set‑up, adjust readhead to obtain Green flashing LED
Calibrating incremental signals
Calibrating reference mark
AGC on, optimum set-up
AGC off, optimum set-up
Poor set‑up; signal may be too low for reliable operation
Reference mark detected (visible indication at speed
< 100 mm/s only)
Low signal, over signal, or overspeed; system in error
10