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

OEM650/OEM650X • TROUBLESHOOTING
43
Symptoms Possible Causes Solutions
Power LED is not
on (illuminated)
The drive is not receiving
adequate DC voltage
Drive screw are terminals loose
Verify the VDC+ and VDC- connection
Verify you power supply is producing
adequate power
Verify that there is DC voltage at the
drive and at the VDC+ and VDC-
connection
Tighten screws—do not tin wires
Power LED is
flashing
DC Line voltage is too low
I/O incorrectly connected
Internal damage to the drive
Check DC line voltage (24VDC
minimum)
Remove 25-Pin D connector to isolate
the problem
Return drive to Compumotor for
servicing
There is little or no
holding torque; the
power LED is on;
the motor fault LED
is off
The current select resistor is not
installed or loose
The incorrect current select
resistor is being used
Jumper #1 removed and you want
between 7.5A - 2.5A
Remote input activated
Auto standby function enabled
Check for current select resistor,
tighten screws, check wiring
Verify the current selector resistor with
the current table—measure the resistor
with an ohmmeter
Install Jumper #1. Double check the
desired resistor value
Remove 25-pin D connector to isolate
the problem
Check jumpers #9 and #10
The motor fault LED
is on
The motor is not connected
A motor winding is open
The drive has detected a short
circuit in the motor wiring
The drive is overheating
The drive may have internal
damage
Connect the motor
Measure winding continuity—check the
series connections for an 8-leaded
motor
Check for miswiring—carefully check
the motor wires for loose strands
shorting the windings
Verify that the drives heatsink does not
exceed 55°C
Return the drive to Compumotor for
servicing
The motor moves
erratically at low
speeds
Motor current is set incorrectly
Indexer pulses are being sent to
the drive erratically
Motor resolution is set for 200 or
400 steps per revolution
Check the current select resistor and
verify that the current is set correctly
Verify, with an oscilloscope, that the
indexer pulses are being sent at a
constant rate and are not being
frequency modulated
Full and half step modes will cause the
motor to run roughly at low speeds