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Chapter 9 Troubleshooting
DMC-18x2
Using DMC Smart Terminal,
DMCDOS, or WSDK cannot
communicate with the controller.
Plug and Play installation did not
proceed properly
Check first that Dmc1802.INF was
used to install the controller. Next
check the controller registry to see
if the controller was automatically
added and an address selected.
Stability
SYMPTOM CAUSE REMEDY
Motor runs away when the loop is
closed.
Wrong feedback polarity.
(Positive Feedback)
Invert the polarity of the loop by
inverting the motor leads (brush type)
or the encoder (channel A+, B+ if
single ended; channel A+, A- if
differential)
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 ?
Anything.
Interrogate the cause with TC or
TC1.
Motor does not start or complete a
move.
Noise on limit switches stops the
motor. Noise on the abort line
aborts the motion.
To check the cause, interrogate the
stop code (SC). If caused by limit
switch or abort line 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. Also use a scope to
see the noise. Reduce noise. Use
differential encoder inputs.
Same as above.
Programming error.
Avoid resetting position error at
end of move with SH command.
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Summary of Contents for DMC-18 2 Series
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