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6-4 Troubleshooting MN1904
6.2.2 Motor control
Symptom Check
NextMove BX
II
appears
to be working but will not
cause motor to turn.
Check that the connections between motor and drive are
correct. Use WorkBench v5 to perform the basic system tests
(see section 5.4).
Ensure that while the NextMove BX
II
is not in error, the drive is
enabled and working. When the NextMove BX
II
is first powered
up the drive should be disabled if there is no program running
(there is often an LED on the front of the drive to indicate
status).
Check that the servo loop gains are setup correctly - check the
Fine-tuning window. See sections 5.5 to 5.7.
Motor runs uncontrollably
when controller is
switched on.
Check that the encoders are connected, they have power
through Encoder V+ (if required, see sections 4.4.1 and 4.7.1)
and are functioning correctly . Use a dual trace oscilloscope to
display both channels of the encoder and/or the complement
signals simultaneously .
Check that the drive is connected correctly, and that with zero
demand from the NextMove BX
II
there is 0V at the drive
demand input. See section 5.4.1.
Verify that the Ne xtMove BX
II
and drive are correctly grounded
to a common earth point.
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.
Check that the axis’ corresponding encoder and demand
signals are connected to the same axes of motion. 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 Mint 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 loop gains may be set incorrectly. See sections 5.5 to
5.8.