Baldor MN1903 installation manual Output polarity

Symptom	Check
Motor runs uncontrollably	Check that the axis’ corresponding encoder and demand
when controller is switched	signals are connected to the same axes of motion. Check
on and servo loop gains are	the demand to the drive is connected with the correct
applied or when a move is	polarity.
set in progress. Motor then
stops after a short time.	Check that for a positive demand signal, a positive increase
	in axis position is seen. The MintMT ENCODERMODE
	keyword can be used to change encoder input direction.
	The MintMT DACMODE keyword can be used to reverse DAC
	output polarity.
	Check that the maximum following error is set to a
	reasonable value. For setting up purposes, following error
	detection may be disabled by setting FOLERRORMODE = 0.
Motor is under control, but	Servo loop gains may be set incorrectly. See sections 5.4.2
vibrates or overshoots	to 5.6.
during a move.
Motor is under control, but	Using an oscilloscope at the breakout module connectors,
when moved to a position	check:
and then back to the start it
does not return to the same	H all encoder channels are clear signals and free from
position.	electrical noise;
	H they are correctly wired to the controller;
	H when the motor turns, the two square wave signals are
	90 degrees out of phase. Also check the complement
	signals.
	Ensure that the encoder lead uses shielded twisted pair
	cable and that the shield is attached to the shield connection
	only at the breakout module end.
	Verify that the breakout module and drive are correctly
	grounded to a common earth point.

6-4 Troubleshooting MN1903