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Reference mark selector and limit magnet installation
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 selected IN-TRAC reference mark as shown.
As the TONiC 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, refer to
'RKLC20-S scale 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 'RKLC20-S scale 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.
TONiC RKLC20-S linear installation guide
P limit magnet
NOTE: The reference mark selector
and limit actuator locations are correct
for the readhead orientation shown.
Applicator tool
(A-9653-0201)
Remove
self-adhesive
backing paper
Selected IN-TRAC
reference mark
Q limit magnet
Reference mark
selector magnet
7
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