Rockwell Automation 1395 Encoder Driver Module - Manual (Page 6)

Encoder Driver Module
Instructions
6
4. After all terminations have been made for your particular application,
reapply Power to the Drive and check the Encoder Driver Interface
Module for correct operation.
Troubleshooting If the Encoder Driver Module does not seem to be operating properly
check the following:
1. Check that all connections and cables are undamaged and are securely
and correctly connected at the ED Module, the Digital Reference
Adapter Board and the reference device.
2. Check that the ED Module has correctly rated DC power applied to it.
!
ATTENTION: Potentially fatal voltages may result from improper
useage of an oscilliscope or other test equipment. The oscilliscope
chassis may be at a potentially fatal voltage if not properly grounded.
If an oscilliscope is used to measure high voltage waveforms, use only
a dual channel oscilliscope in the differential mode with X 100 probes.
It is recommended that the oscilliscope be used in the A minus B
Quasi–differential mode with the oscilliscope chassis correctly
grounded to an earth ground. Refer to equipment safety instructions for
all test equipment before using with the Encoder Driver Module or
1395 Drive.
3. Check the encoder for proper power supply connections & value of
supply.
4. Check the encoder outputs as well as any interface electronics between
the encoder and the output terminals to the module.
5. If encoder outputs and signal outputs are correct, check signal channel
outputs for pulse train information with the encoder rotating.
6. For Quadrature encoder signals, use a dual trace oscilliscope with A
minus B differential capability to look for the correct differential pulse
train coming into the drive at the Digital Reference Adapter Board. If
the correct pulse train is not present, the ED Module may be
malfunctioning.
7. DO NOT attempt to open or repair a suspect Encoder Driver Module.
Return the unit to an authorized Allen–Bradley service center for repair
or replacement.