1331 Troubleshooting Guide Maintenance The Bulletin 1331 is convection cooled by air flowing over the heat sink fins. Air flow must never be restricted. Heat sink fins or enclosure vents must never become obstructed with dirt or foreign matter. Periodically inspect and clean the drive only after removing all power. Do not use aromatic or petroleum based solvents to clean plastic parts of the drive. Troubleshooting Six status and fault LEDs are provided on the Bulletin 1331 as a troubleshooting guide. The following charts indicate drive malfunctions and the approved procedures for correcting these malfunctions Warning: Power must be applied to the drive with the cover removed to perform certain troubleshooting procedures. Voltages on many components are at incoming lone potential or bus voltage. To avoid electrical shock hazard or damage to equipment, do not touch any drive component other than those specified in the troubleshooting procedure. Motor does not run - Bus LED is illuminated - No other LEDs are illuminated Is run signal present at control terminal block TB1 term 6B No Verify continuity of contact or relay connections Yes Consult your nearest AllenBradley area sales/support center for assistance. Motor does not run - Bus and Run LEDs are illuminated - No other LEDs are illuminated Is a speed command present at TB1 term. 1W, 2W and 3O (speed potentiometer) or at TB1 term. 3O and 4Y (0-10V DC speed signal) No Correct the cause Yes Is the motor securely connected to output terminals M1/T1, M2/T2, M3/T3? Yes Consult your nearest AllenBradley area sales/support center for assistance No Verify and resecure connections if necessary. Check motor thermal overloads for a tripped condition and reset if necessary. Motor does not run continuously - LV LED is illuminated - Bus voltage is at or below 220V DC Has the input voltage dropped below 10% of rated line voltage? Yes Monitor the incoming line voltage and correct the condition. No When the drive is reset is the LV LED still lit? Yes Monitor the incoming line voltage for low voltage transient conditions and correct the condition No Consult your nearest AllenBradley area sales/support center for assistance. Motor does not run continuously - OH LED is illuminated - Heatsink temperature is at or above 100°°C Is the ambient temperature above the rated limit (40°C)? Are the heat sink fins dirty or enclosure vents clogged? No Consult your nearest AllenBradley area sales/support center for assistance. Yes Lower the ambient temperature. Clean heat sink fins and enclosure vents. Motor does not run continuously - OC LED is illuminated - output is at or above 200% of rated input current Does a ground fault exist between the drive output and the motor? Yes Correct the cause Yes Lighten the load or replace the drive and motor with the correct size for the application. Yes Increase accel time. No Is the load within the rated current of the drive? No Is the acceleration time to short? No Does an OC fault occur when the motor is disconnected at output terminals M1/T1, M2/T2, M3/T3? No Yes Consult your nearest Allen-Bradley are sales/support center for assistance. ← Verify motor operation by line operating the motor - First under no load conditions - The under load conditions if permissible. Is required motor operation achieved? ↓ Yes or No Motor does not run continuously - OV LED is illuminated - Bus voltage is at or above 400V DC Has the input voltage risen above 10% of rated line voltage? Yes Monitor incoming line voltage and correct the condition. Yes Increase the decel time. No Does the input voltage rise above 10% of rated line voltage only during decel? No Does the motor encounter an overhauling load (load drives motor speed beyond set speed)? Yes or No Consult your nearest Allen-Bradley area sales/support center for assistance.