TMC-4 Control Card
for Electric Actuators
Installation & Maintenance Manual
22
04/06/22
www.atcontrols.com
IOM08139 REVISION 04
6. Troubleshooting
Problem
Cause
Solution
No Display
In Sleep mode.
Press joystick in any direction.
Run/Program switch in wrong position.
Ensure switch is pointed away from USB connector.
No power.
Confirm supply connected.
Blown fuse.
Replace fuse.
Not responding to
command signal
Incorrect wiring.
Check wiring.
Incorrect command signal type.
Change command type.
Incorrect command signal calibration.
Recalibrate command zero and span.
Incorrect position calibration.
Recalibrate Open and Close position.
Position feedback potentiometer gears loose.
Check potentiometer gears are tight. If loose, repeat
position calibration.
Position feedback potentiometer not set correctly.
Confirm potentiometer is at midrange at 50%
position.
Incorrect switch action setting.
Change switch action setting.
No feedback or
feedback is not
correct
Incorrect wiring.
Check wiring.
Incorrect feedback type.
Change feedback type.
Incorrect feedback calibration.
Recalibrate feedback zero and span.
External loop power being provided.
Remove external loop power.
Actuator is hunting
Noisy input signal.
Check input signal.
Deadband setting too low.
Increase deadband setting.
Not moving to set
positions
Mechanical stops adjusted in too far.
Adjust mechanical stops outside of operating range
according to actuator instructions.
Limit switches adjusted in too far.
Adjust limit switch cams outside of operating range
according to actuator instructions.
Position feedback potentiometer gears loose.
Check potentiometer gears are tight. If loose, repeat
position calibration.
Motor is pulsing
when moving
Motor temperature too high. (if using motor
temperature monitor option)
Slow operation to allow motor to cool.
Actuator moving in
wrong direction
Open and close position set incorrectly.
Check open and close position calibration.
CW / CCW wiring reversed.
Check wiring.
Zero and span set reverse.
Check zero and span settings.
CMD = LOST
Incorrect Command Type.
Confirm Command Type setting is correct.
Disconnected or reversed signal wires.
For voltage or mA command, disconnected input
wires will read ~1-3. Reversed input wires will read 0.
