Reference Mark Selector And Limit Magnet Installation; Datum Clamp - Renishaw QUANTiC RTLC40-S Installation Manual

RTLC40-S: 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. 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.
As the QUANTiC readhead passes the reference mark selector magnet or limit
switch magnet, a force of up to 0.2 N is generated between the magnet and the
concentrators on the readhead. The design of the bracket should be sufficiently
stiff so that it is able to tolerate such force without distorting.
Following the clamping instructions on the scale installation will prevent this
magnetic force from disturbing the scale.
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.
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 'RTLC40-S: Installation drawing').
NOTE: External magnetic fields greater than 6mT, in the vicinity of the readhead,
may cause false activation of the limit and reference sensors.
Optional bolted reference mark selector and limit magnets
22
18
10
*
Ø2.2
3.7
18.5 ±1
*
Supplied with 2 x M2 x 4 screws.
Bolted magnet type
P limit
Q limit
Reference mark selector
QUANTiC linear installation guide
NOTE: The reference mark selector
and limit actuator locations are correct
for the readhead orientation shown.
RTLC40-S: Datum clamp
IMPORTANT: Allow 24 hours after scale application before fitting datum clamp.
1.85
The datum clamp (A-9585-0028) fixes the RTLC40-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.
1
Part number
A-9653-0292
A-9653-0291
A-9653-0290
P limit magnet
Place the datum clamp with cut-out against the scale at
the chosen location.
A-9585-0028
Applicator tool
(A-9653-0201)
Remove
self-adhesive
backing paper
IN-TRAC
reference mark
Q limit magnet
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.
Reference mark
selector magnet
435 )
® ™
Ensure the adhesive
wicks along the entire
length of cut-out.
5