Reference Mark Selector And Limit Magnet Installation; Datum Clamp - Renishaw TONiC FS T3 Series Functional Safety Installation Manual And Safety Manual

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 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 scale installation instructions 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
(see 'RTLC20-S scale installation drawing' on page
NOTES:
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 along the outer edge of the magnet
assembly. Optional bolted reference and limit magnets are available: for details
see 'RTLC20-S scale installation drawing' on page
X The reference mark selector and limit actuator locations are correct for the
readhead installation shown.
X External magnetic fields greater than 6mT, in the vicinity of the readhead, may
cause false activation of the limit and reference sensors.

Datum clamp

IMPORTANT: Allow 24 hours after scale application before
fitting datum clamp.
The datum clamp (A-9585-0028) fixes the RTLC20-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 customer's requirements.
TONiC RTLC20-S Functional Safety installation guide and safety manual
P limit magnet
7).
7.
1 Remove the backing paper from
the datum clamp. Place the datum
clamp with cut-out against the scale
at the chosen location.
2
Place a small amount of adhesive
(Loctite ® 435
the datum clamp, ensuring none
of the adhesive wicks onto the
scale surface.Dispensing tips
P-TL50-0209 are available.
Ensure the adhesive wicks along
the entire length of cut-out.
Original instructions
Remove
self-adhesive
backing paper
Selected IN‑TRAC
reference mark
Q limit magnet
™ ) in the cut-out on
Applicator tool
(A-9653-0201)
Reference
mark selector
magnet
9