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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 (T3010 readhead only) should be positioned adjacent to the selected IN‑TRAC reference
mark as shown below.
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.
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
FS T301x readhead installation drawing' on page
NOTES:
X
Reference mark selector magnet is only required for
RSLC20 scale and T3010 readheads.
X
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 at each end of
the magnet assembly.
X
The reference mark selector and limit actuator
locations are correct for the readhead installation
shown.
External magnetic fields greater than 6mT, in the
X
vicinity of the readhead, may cause false activation of
the limit and reference sensors.
TONiC RSLM20/RELM20 Functional Safety installation guide and safety manual
P limit magnet
(see 'TONiC
6).
Remove
self-adhesive
backing paper
Original instructions
Applicator tool
(A-9653-0201)
Reference mark
selector magnet
Selected IN‑TRAC
reference mark
Q limit magnet
10
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