Specifications

MN715P Troubleshooting 5-3
3. Bus faults
(Over-voltage, Under-voltage or Precharge faults)
Power LED
Fault LED Description
ON 3 blinks High or low DC bus voltage is detected or DC
Bus charging error detected.
Press Stop to reset the control, if error remains try these steps to correct the
fault.
a. Lengthen DECEL time (P2).
b. Add external dynamic braking assemblies.
c. Correct problem with motor load.
d. Check dynamic brake hardware wiring.
e. Verify proper AC line voltage. Use step down transformer if needed.
Use line reactor to minimize spikes.
f. Check power line disturbances (sags caused by start-up of other
equipment). Monitor power line fluctuations with date and time imprint
to isolate power problem.
4. Dynamic Brake or Over-temperature faults
Power LED
Fault LED Description
ON 4 Blinks Dynamic Brake power limit or excessive control
temperature.
Press Stop to reset the control, if error remains try these steps to correct the
fault.
a. Correct motor loading. Verify proper sizing of control, motor and brake
resistor.
b. Relocate control to a cooler operating area. Add cooling fans or air
conditioner to control cabinet.
c. Remove debris from fan and heatsink surfaces.
d. Verify fan operation. Replace fan or check fan wiring.
5. Microprocessor faults
(Communication timeout, incompatible front end and power boards,
EEPROM or Power Base ID faults)
Power LED
Fault LED Description
ON 5 Blinks Cable defect or other internal problem.
a. Press Stop to reset the control.
b. Turn power OFF then ON (cycle power). If fault remains call Baldor.