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Page 27
IronHorse GSD4A / GSD4 DC Drives User Manual – 2nd Ed. Rev. A – 10/14/2019
Troubleshooting (GSD4A/GSD4 Models)
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 below.
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
Motor stalls, or runs very
slowly with speed control
set fully CW
1) No motor or load connected
2) Speed pot low connection open
3) Low voltage
4) Overload condition
5) Worn motor brushes
6) Max speed set incorrectly
1) Ensure that motor or load is connected to armature
terminals
2) Ensure that Speed pot Low wire is connected
3) Ensure that VAC is above 100VAC
4) Reduce load or increase motor size Current Limit
setting
5) Replace brushes
6) 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) Motor speed is above rated speed
5) Max set too high
1) Motor current must be greater than 150 mA (DC)
2) Consult “Trim Pot Adjustments” section
3) Consult “Trim Pot Adjustments” section
4) Reduce speed
5) Consult “Trim Pot Adjustments” section
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 – disconnect to test
3) Replace brushes
4) Replace bearings
5) Contact AutomationDirect “Product Returns” for
replacement
GSD4A Series Accessories
NOTE: There are only five accessories that can be used with both GSD4A
and GSD4 drives: GSDA-5K (Replacement Potentiometer), GSDA-DP (Digital
Potentiometer), GSDA-MREV (Manual reverse switch), GSDA-DP-S (Signal
conditioner), and GSDA-DP-D (closed loop digital potentiometer).
All other accessories are only compatible with either GSD4A or GSD4 drives.
GSDA-5K
Spare/Replacement potentiometer for all GSD4A and GSD4-24x-xxxxx DC drives.
For installations instructions, please refer to product insert sheet at
GSDA-DP
Optional digital potentiometer for all GSD4A and GSD4-24x-xxxxx DC drives.
For installations instructions, please refer to product user manual at
.
GSDA-MREV
Optional manual reverse switch for all GSD4A and all GSD4-24x-xxxxx DC drives.
For installations instructions, please refer to product insert sheet at
GSDA-DP-S
Optional signal conditioner for all GSD4A and all GSD4-24x-xxxxx DC drives.
For installations instructions, please refer to product insert sheet at
GSDA-DP-D
Optional closed loop digital potentiometer for all GSD4A and all GSD4-24x-xxxxx DC drives.
For installations instructions, please refer to product insert sheet at