User guide

Acu-Rite Companies Inc.
ENC 250
™
MULTI-SECTION
10
• Coat the plastic plug with silicone grease and install it
into the tensioning hole.
• This completes the installation of the ENC 250.
Apply silicone grease to plug
and reinsert it
• With the readout properly mounted, route the cable with
sufficient slack loops for machine movement to the readout.
• Secure cables by fastening with clips or ties.
• Attach the encoder connectors to the readout.
Electrical shielding ...
• Connect a ground wire from the terminal on the back of
the readout to the machine or earth ground.
• Attach a ground wire from the machine to a solid earth
ground.
• With the encoder attached to the cable connected to the
readout, check shielding by measuring resistance
between connector housing and scale unit.
Desired value: 1 ohm max.
If you experience difficulties with your installation, do the
following to determine the problem.
Checking the Readout
Difficulties on more than one axis are usually associated
with the readout. Follow these steps to determine if your
difficulties are associated with the readout:
• Ensure that the linear encoder connectors are correctly
seated.
• Swap linear encoder cables at the readout to see if the
problem is still shown in the same display.
• If the problem remains in the same display, the readout
may be in error. To determine if that is the problem,
repeat above steps with both encoders, but with only one
encoder connected at a time. This should allow you to
determine if the problem is with the readout or the
encoder.
• If the problem follows the connection change, the linear
encoder may be in error.
If the Readout is at fault, refer to “What to do” to arrange
for the parts necessary to repair your system. If a linear
encoder appears to be at fault, proceed with “Checking the
Linear Encoders”.
Checking the Linear Encoders
Problems on a single axis are usually associated with the
linear encoder or its installation. Difficulties can be caused
by improper installation, loose or misaligned bracketry, or
a damaged or inoperable encoder.
Follow these steps to determine the cause of your system
difficulties:
• Confirm that your bracketry and installation does not
interfere with other machine structures through the
entire length of the linear encoder travel.
• Check for loose fasteners. If you find loose fasteners, first
confirm that the linear encoder is installed to the
tolerances specified and then retighten the fasteners as
required.
• Confirm that the linear encoder is installed to the
specified alignment tolerances. If the installation does
not meet the tolerances, reinstall the encoder according to
the “Installation Procedure”.
• Do not attempt to repair the reading head or scale
assembly. The ENC 250 is field serviceable by assembly
replacement only. Attempts to repair the encoder can
permanently damage it and void the warranty.
What to do
If an ACU-RITE linear encoder or readout is found to be at
fault, please contact your Authorized Distributor for
instructions prior to removing the encoders or readout.
Trouble Shooting