10
QUANTiC RTLC40 /
FASTRACK
installation guide
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
installation drawing’, page 4)
.
Reference mark selector and limit magnet installation
For accuracy and ease of positioning of reference mark selector and limit magnets, the applicator tool 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 selected
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.
NOTES:
u
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.
u
The reference mark selector and limit actuator locations are correct for readhead
orientation shown
u
The reference mark selector magnet is only required for ‘Customer selectable
reference mark’ readheads. For more information refer to
QUANTiC series encoder
system
data sheet (Renishaw part no. L-9517-9778).
u
All limit and reference selector magnets should be aligned with the outer edges of
the
FASTRACK
.
u
External magnetic fields greater than 6 mT, in the vicinity of the readhead, may cause
false activation of the limit and reference sensors.
Remove self-adhesive
backing paper
Reference mark
selector magnet
Selected
IN-TRAC
reference mark
Q limit magnet
Magnet applicator tool
P limit magnet