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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 below.
As the VIONiC 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
('VIONiC readhead
installation drawing', page
4).
NOTES:
X
Reference mark selector magnet is only required for
RSLC20 scales.
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.
X
The reference mark selector magnet is only required for
'Customer selectable reference mark' readheads. For more
information refer to VIONiC series encoder system data
sheet (Renishaw part no. L-9517-9678).
X
External magnetic fields greater than 6mT, in the vicinity of
the readhead, may cause false activation of the limit and
reference sensors.
VIONiC RSLM20/RELM20 installation guide
P limit
magnet
Applicator tool
(A-9653-0201)
Remove
self-adhesive
backing paper
Selected IN-TRAC reference mark
Q limit magnet
Reference mark
selector magnet
10
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