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IronHorse GSD5 DC Drives User Manual – 1st Ed, Rev E – 05/13/2020
Troubleshooting
If a newly installed DC Drive will not operate, it is likely that a terminal connection is loose. Check the
terminal connections and ensure that they are secure and correct. If the drive is still inoperative, refer
to the Troubleshooting Table.
Troubleshooting
Problem
Possible Cause(s)
Corrective Action
Motor doesn’t run
1) Blown fuse or circuit breaker
2) Incorrect or no power
3) Speed pot set at zero
4) Worn motor brushes
1) Replace fuse or reset breaker
2) Install proper power service
3) Rotate Speed pot CW to start
4) Replace motor brushes
Armature output
voltage cannot be
adjusted; output is a
constant DC level
1) No motor or load connected
2) Speed pot low connection open
1) Ensure that motor or load is connected to
armature terminals
2) Ensure that Speed pot Low wire is connected
Motor stalls, or runs
very slowly with speed
control set fully CW
1) Low voltage
2) Overload condition
3) Worn motor brushes
4) Max speed set incorrectly
1) Ensure that VAC is above 108 VAC
2) Reduce load or increase motor size
3) Replace brushes
4) Consult “Trim Pot Adjustments” section
Motor “hunts”
1) Too much IR Comp
2) Motor is in Current Limit
3) Motor not pulling enough current
4) Max trim pot set too high
5) Motor speed is above rated speed
1) Consult “Trim Pot Adjustments” section
2) Consult “Trim Pot Adjustments” section
3) Motor current must be greater than 150 mA (DC)
4) Consult “Trim Pot Adjustments” section
5) Reduce speed
Repeated fuse blowing
1) Low voltage
2) Overload condition
3) Worn motor brushes
4) Defective motor bearings
5) Defective electrical components
1) Ensure that VAC is above 108 VAC
2) Reduce load
3) Replace brushes
4) Replace bearings
5) Contact distributor or representative
Motor runs, but will not
stop
1) Incorrect wiring (enclosed drive)
2) Defective wiring
3) Jumper inhibit
4) Defective component
1) Ensure that Terminal Strip Wiring is correct per
wiring instructions/diagrams (check AC line
connection in particular)
2) Check wiring
3) Check jumper inhibit pin connection (P2)
4) Contact AutomationDirect “Product Returns” for
replacement
