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IronHorse GSD7 DC Drives User Manual – 1st Ed, Rev C – 10/24/2018
T
rOUbleSHOOTinG
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 100 VAC for 120V
systems and above 200V for 240V systems
2) Reduce load or increase motor size or Current
Limit setting
3) Replace brushes
4) Consult “Trim pot Adjustments” section
Motor “hunts”
1) Motor current less than 150 mA
2) Too much IR Comp
3) Motor is in Current Limit
4) Max trim pot set too high
5) Motor speed is above rated speed
1) Motor current must be greater than 150 mA (DC)
2) Consult “Trim pot Adjustments” section
3) Consult “Trim pot Adjustments” section
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 100 VAC for 120V
systems and above 200V for 240V systems
2) Reduce load
3) Replace brushes
4) Replace bearings or motor
5) Contact AutomationDirect “Product Returns” for
replacement
