Galil DMC-2X00 user manual Communication, Stability, Operation

Communication

SYMPTOM	CAUSE
Using terminal emulator, cannot	Selected comm. port incorrect
communicate with controller.
Same as above	Selected baud rate incorrect

REMEDY

Try another comport

Check to be sure that baud rate same as dip switch settings on controller, change as necessary.

Stability

SYMPTOM	CAUSE	REMEDY
Motor runs away when the loop is	Wrong feedback polarity.	Invert the polarity of the loop by
closed.		inverting the motor leads (brush type)
		or the encoder.
Motor oscillates.	Too high gain or too little	Decrease KI and KP. Increase KD.
	damping.

Operation

SYMPTOM	CAUSE	REMEDY
Controller rejects command.	Anything.	Interrogate the cause with TC or
Responded with a ?		TC1.
Motor does not complete move.	Noise on limit switches stops the	To verify cause, check the stop
	motor.	code (SC). If caused by limit
		switch noise, reduce noise.
During a periodic operation, motor	Encoder noise	Interrogate the position
drifts slowly.		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.

DMC-2X00 Chapter 9 Troubleshooting y 131