2-14
MN716
Troubleshooting
The control has LEDs to display the control’s operational status.
A. Power On
This lamp indicates AC power is applied to the control.
B. CURRENT LIMIT (CL)
Indicates that the drive is in Current Limit. If set in the timed Current Limit mode (J6 set to TCL)
and has timed out, the LED 2 will remain ON until the drive is restarted.
C. Forward Enable (FWD EN)
Indicates that the drive is engaged in the forward direction. [Enable circuit closed, (terminals 8 and
9), the start circuit asserted and a forward speed command.]
The FWD EN lamp will also be lighted in the reverse direction if the control is in regeneration.
D. Reverse Enable (REV EN)
Indicates that the drive is engaged in the reverse direction.
[Enable circuit closed (terminals 8 and 9), the start circuit asserted and a reverse speed
command.]
The REV EN lamp will also be lighted in the forward direction if the control is in regeneration.
Table 2-9 Troubleshooting Guide
Indication / Symptom Possible Soloutions
Motor is not running and Power On LED indicator
is illuminated.
Start-Stop switch is in the STOP position. If this mode is used,
place the switch in the START position.
The Main Speed Potentiometer is set to zero speed. Set the Main
Speed Potentiometer for the desired speed.
The Main Speed Potentiometer, signal input, or motor connections
are open. Verify Main Speed Potentiometer, signal input, or motor
connections.
Power ON LED indicator is not illuminated.
Check AC Line connections have been made. Verify correct wiring.
Check AC Line fuse.
Motor runs then stops after a short time or, The
Drive trips due to overload (TCL Fault).
The drive must be manually restarted by disconnecting and
reconnecting the AC power. Reduce load.
Line fuse blows or circuit breaker trips.
The line fuse or circuit breaker installed is the incorrect rating. See
Table 1-4 for the correct line fuse or circuit breaker rating. Check
for loose or damaged wiring.
Logic Control Board fuse, F1, blows.
Check to see if signal or control wiring is not shorted or grounded.
Verify Start/Stop switch, Enable switch, and Speed Adjust pot are
operating properly and are not shorted or grounded.
CL LED indicator is illuminated.
Motor is overloaded. Check motor amps with DC ammeter in
series with armature. (If motor is shunt type, field may be open or
not receiving proper voltage.)
Check motor for shorts or grounds. Motor may be defective.
Check position of CL trimpot. The CL may be set too low.
Rapid Acceleration change will cause the LED to illuminate. Verify
potentiometer setting.
Motor runs at high speed and does not respond to
main adjust speed pot or reference signal.
Check field wiring. If using tachometer feedback, check
tachometer signal.
Note: For any other problems, consult your local Baldor District Office.
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