Filter
Top Products
Troubleshooting 7-5MN1928
Symptom Check
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.
(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.
Motor is under control, but
vibrates or overshoots
during a move.
(Servo outputs only) Servo loop gains may be set
incorrectly . See sections 6.5.2 to 6.7.
Motor is under control, but
when moved to a position
and then back to the start it
does not return to the same
position.
Verify that the backplane and drive are correctly grounded to
a common earth point.
(Servo outputs only) Using an oscilloscope at the backplane
connectors, check:
H all encoder channels are free from 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 cable uses shielded twisted pair
cable, with the outer shield connected at both ends and the
inner shields connected only at the NextMove ES end.
(Stepper outputs only) The motor is not maintaining
synchronization with the NextMove ES 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.
7.2.5 WorkBench v5
Symptom Check
The Spy window does not
update
The system refresh has been disabled. Go to the Tools,
Options menu item, select the System tab and then
choose a System Refresh Rate (500ms is recommended).