- Compumotor OEM650/OEM650X OEM350/OEM350X Drive and Drive/Indexer User Guide

TROUBLESHOOTING • OEM650/OEM650X
44
Symptoms Probable Causes Solutions
The drive loses
pulses at high
speed
Indexer is overdriving step input
Indexer is underdriving step input
Indexer is sending pulses too fast
Motor is out of torque
Verify that the step input current is not
greater than 15 mA
Verify that the step input current is
greater than 6.25 mA
Verify that the indexer is not exceeding
the 2 MHz maximum pulse rate
Verify that the motor is sized correctly
for your application
The motor stalls at
high speeds
The velocity is too high
Motor current is not set correctly
Motor is undersized for
application
The drive can handle a maximum pulse
rate of 2 MHz or 50 rps, whichever
comes first—decrease the velocity
Check the current select resistor and
verify that the current is set correctly
Verify that the motor is sized correctly
for your application
The motor stalls
during acceleration
Motor current is not set correctly
The acceleration is set too high
There is insufficient rotor inertia
Motor is undersized for application
Check the current select resistor and
verify that the current is set correctly
Decrease the acceleration
Add inertia to the motor shaft
Verify that the motor is sized correctly
for your application
The motor
(unloaded) stalls at
nominal speed
There is insufficient rotor inertia
Mid-frequency resonance
Add inertia to the motor shaft
Add a damper to the shaft
Motor does not
move commanded
distance
Motor resolution is set incorrectly Determine the resolution on your
indexer and verify that the drive
resolution setting is the same
Motor will not
change direction as
commanded
The direction input is not being
enabled
Verify that the direction input is being
enabled (6.4 mA to 15 mA)
Indexer moves
motor in wrong
direction
There is a direction conflict within
the indexer
Change direction within your indexer or
by swapping motor leads A+ and A- at
the drive connector
When a move is
commanded, no
motion occurs
A limit may be enabled and active
You may be in Absolute mode and
are already at the position you are
commanding the motor to move to
Check hard limit or disable limits with
the LD3 command
Try another distance and issue Go (G)
command
The unit may
appear to not be
responding to
commands
If you defined a sequence and
never issued XT, the
OEM650/OEM650X still thinks
you are defining a sequence
OEM650X may be off-line (F
command)
Issue an XT command at the end of the
sequence to end sequence definition
Issue an E command to bring the unit
on-line