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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. It must not be allowed to work itself loose due to vibration.
NOTES:
X
Recommended screw type M2.5 × 0.45 and must comply with:
ISO 4762/DIN 912 grade 8.8 minimum/ANSI B18.3.1M.
X
The use of a thread locking compound is recommended.
X
No washer is required under the screw head.
X
Minimum thread engagement 5 mm (7.5 mm including counterbore).
X
Tightening torque 0.25 Nm to 0.4 Nm.
X
Mounting hole clearance will contribute to mechanical safe position.
Readhead set-up LED status
* For further information on LED status
see page
18.
TONiC RESM20 Functional Safety installation guide and safety manual
*
Green Orange Red
Green spacer
Pitch
Optical centreline
0° ±1°
Readhead set-up
Ensure that the ring, readhead optical window and mounting face are clean and free from obstructions.
NOTES:
X
Ensure protective film is removed from the ring before installing the readhead.
X
When cleaning the 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 maximise the signal strength
and achieve a Green set-up LED on the readhead (>70% signal) for a complete rotation. If a DOP interface is
used, aim for a Blue LED on the interface.
NOTE: The readhead should be installed and set up with the Automatic Gain Control (AGC) switched off
(CAL LED off). When re-installing the readhead, factory defaults should be restored
Yaw
0° ±0.4°
Rideheight
2.1 ±0.15 mm
Original instructions
*
DOP interface set-up LED status
Blue Green Orange Red
Purple
Roll
0° ±0.5°
(see page
17).
16
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