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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
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 along the full axis of travel
to achieve a Green set-up LED on the readhead (>70% signal).
If a digital Ti/TD interface is used, aim for a Blue LED on the interface
NOTE: The readhead should be installed and set-up with the AGC
switched off (CAL LED off). When reinstalling factory defaults
should be restored.
Readhead set-up LED status
Green Orange Red
Yaw
0° ±0.4°
Pitch
0° ±1°
TONiC RTLC-S installation guide
Reference mark selector and limit magnet installation
IMPORTANT: Allow 24 hours after scale application before fitting magnets.
For accuracy and ease of positioning of reference mark selector and limit magnets, the applicator tool (A-9653-0201) should be used.
The magnet should be attached to the applicator tool as shown below. Limit magnets can be positioned at any user defined location along
the scale, but the reference mark selector magnet should be positioned adjacent to the chosen IN-TRAC reference mark as shown below.
NOTE: Reference and limit magnets may creep when influenced by magnetic materials
in close proximity. In such cases, they should be held in place using an additional fillet
of epoxy glue or similar along the outer edge of the magnet assembly.
Optional bolted reference and limit magnets are available,
refer to 'RTLC-S installation drawing' for details.
Limit trigger point
The limit output is nominally asserted when the
readhead limit switch sensor passes the limit magnet
leading edge, but can trigger up to 3 mm before that edge.
(See 'RTLC-S installation drawing')
Roll
0° ±0.5°
Datum clamp
The datum clamp fixes the RTLC-S scale rigidly to the substrate at the location chosen.
The metrology of the system may be compromised if the datum clamp is not used.
The datum clamp does not need to be fitted adjacent to a reference mark.
It can be positioned anywhere along the axis depending upon the customers' requirements.
Green spacer
1
Place the datum clamp with cut-out against
Rideheight
the scale at the chosen location.
2.1 ± 0.15 mm
2
Place a small amount of adhesive (Loctite
in the cut-out on the datum clamp, ensuring none
of the adhesive wicks onto the scale surface.
Dispensing tips P-TL50-0209 are available.
P limit magnet
(A-9585-0028)
435
)
®
™
Applicator tool
(A-9653-0201)
Remove
self-adhesive
backing paper
IN-TRAC
reference mark
Q limit magnet
Ensure the adhesive wicks along
the entire length of cut-out.
Correct
position of
reference selector
for readhead
orientation shown
8
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