Communication; Stability; Operation - Galil Motion Control DMC-14 5 Series Manual

Communication

Symptom
Using DMCWIN, DMCDOS,
DMCTERM or WSDK cannot
communicate with the controller
over RS-232
Using DMCWIN, DMCTERM or
WSDK cannot communicate with
the controller over Ethernet

Stability

Symptom
Motor runs away when the loop is
closed.
Motor oscillates.

Operation

Symptom
Controller rejects command.
Responded with a ?
Motor does not start or complete a
move.
During a periodic operation, motor
drifts slowly.
Same as above.
136 Chapter 9 Troubleshooting
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Cause
Improper settings, jumper
configurations and/or cable type
IP address not assigned to
controller, IP address not allowed
in the internal LAN and/or
improper Ethernet cable used
Cause
Wrong feedback polarity.
(Positive Feedback)
Too high gain or too little
damping.
Cause
Anything.
Noise on limit switches stops the
motor. Noise on the abort line
aborts the motion.
Encoder noise
Programming error.
Remedy
1. Make sure that the baud rate
set in the software
corresponds to the baud rate
set by the jumpers on the
controller
2. Make sure a straight-through
RS-232 cable is used
Follow the steps in Chapter for
establishing an Ethernet connection
Remedy
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- and B+,
B- if differential)
Decrease KI and KP. Increase KD.
Remedy
Interrogate the cause with TC or
TC1.
To check the cause, interrogate the
stop code (SC). If caused by limit
switch or abort line noise, reduce
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.
Avoid resetting position error at
end of move with SH command.
DMC-14x5/6