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Communication
Symptom
Cause
Remedy
Baud Rate not correctly configured
Using COMDISK and
TALK2DMC, cannot communicate
with controller.
Check Baud rate switch positions
and registry settings for software
setup.
Set Hardware HSHK DIP switch
Hardware handshaking is not
enabled
(Must be enabled to use Galil
Software)
Serial Cable is not correct
Use serial cable supplied by Galil
or Check pinouts for cable (see
appendix)
Incorrect Com Port Specified
Change registry setting for com
port
Stability
Symptom
Cause
Remedy
Motor runs away when the loop is
closed.
Wrong feedback polarity.
Invert the polarity of the loop by
inverting the motor leads (brush type)
or the encoder.
Motor oscillates.
Too high gain or too little
damping.
Decrease KI and KP. Increase KD.
Operation
Symptom
Cause
Remedy
Controller rejects command.
Responded with a ?
Invalid Command
Interrogate the cause with TC or
TC1.
Motor does not complete move.
Noise on limit switches stops the
motor.
To verify cause, check the stop
code (SC). If caused by limit
switch noise, reduce noise.
During a periodic operation, motor
drifts slowly.
Encoder noise
Interrogate the position
periodically. If controller states
that the position is the same at
different locations it implies
encoder noise. Reduce noise. Use
differential encoder inputs.
Same as above.
Programming error.
Avoid resetting position error at
end of move with SH command.
User Manual DMC-1500
Chapter 9 Troubleshooting • 9 - 134