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

RTLC40/FASTRACK : 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 and aligned with the outer edge of the FASTRACK.
Limit magnets can be positioned at any user defined location along the FASTRACK, but the reference mark selector
magnet should be positioned adjacent to the chosen IN-TRAC reference mark as shown below.
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.
NOTE: All limit and reference selector magnets should be
aligned with the outer edges of the FASTRACK .
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/FASTRACK : 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.
QUANTiC linear installation guide
P limit
magnet
NOTE: The reference mark selector and limit actuator
locations are correct for readhead orientation shown
Applicator tool
(A-9653-0201)
Remove
self-adhesive
backing paper
IN-TRAC
reference mark
Reference mark
selector magnet
Q limit magnet
9