Baldor NextMove ESB-2 Installation Manual page 84

Symptom
Motor runs uncontrollably
when controller is switched on
and servo loop gains are
applied or when a move is set
in progress. Motor then stops
after a short time.
Motor is under control, but
vibrates or overshoots during
a move.
Motor is under control, but
when moved to a position and
then back to the start it does
not return to the same
position.
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ,
MN1957
07045-0097 • (973) 335-1007 • Toll Free: (800) 922-1103
Check
(Servo outputs only) Check that the encoder feedback
signal(s) are connected to the correct encoder input(s).
Check the demand to the drive is connected with the
correct polarity.
Check that for a positive demand signal, a positive
increase in axis position is seen. The ENCODERMODE
keyword can be used to change encoder input direction.
The 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.
(Servo outputs only) Servo loop gains may be set
incorrectly. See sections 5.6.2 to 5.9.
Verify that the NextMove ESB-2 and drive are correctly
grounded to a common ground point.
(Servo outputs only) Check:
all encoder channels are free from electrical noise;

they are correctly wired to the controller;

when the motor turns, the two square wave signals are

90 degrees out of phase. Also check the complement
signals.
Ensure that the encoder cable uses shielded twisted pair
cable, with the outer shield connected at both ends and the
inner shields connected only at the NextMove ESB-2 end.
(Stepper outputs only) The motor is not maintaining
synchronization with the NextMove ESB-2 drive output
signals due to excessive acceleration, speed or load
demands on the motor.
Check that the acceleration, speed and load are within the
capabilities of the motor.
Fax: (973) 335-1661 • www.servosystems.com
www.baldormotion.com
Troubleshooting 6-5