AIM Manual

Electronic Maintenance » Electronic Controls (Page 64)

SubDrive/MonoDrive Troubleshooting

Should an application or system problem occur, built-in diagnostics will protect the system. The “FAULT” light or digital display on the front of the SubDrive/MonoDrive Controller will flash a given number of times or display a number indicating the nature of the fault. In some cases, the system will shut itself off until corrective action is taken. Fault codes and their corrective actions are listed below. See SubDrive/MonoDrive Installation Manual for installation data.

Diagnostic Fault Codes
1MOTOR UNDERLOADOverpumped wellFrequency near maximum with less than 65% of expected load, 42% if DIP #3 is “on”
Broken shaft or couplingSystem is drawing down to pump inlet (out of water)
Blocked screen, worn pumpHigh static, light loading pump reset DIP switch #3 to “on” for less sensitivity if not out of water
Air/gas locked pumpCheck pump rotation (SubDrive only) reconnect if necessary for proper rotation
SubDrive not set properly for pump endAir/gas locked pump if possible, set deeper in well to reduce
Verify DIP switches are set properly
2UNDERVOLTAGELow line voltageLine voltage low, less than approximately 150 VAC (normal operating range = 190 to 260 VAC)
Misconnected input leadsCheck incoming power connection and correct or tighten if necessary correct incoming voltage check circuit breaker of fuses, contact power company
Dragging or failed cooling fanDisconnect fan. Re-apply system power. If 2-flash goes away, replace fan. If 2-flash continues, replace controller. Check fan with 9-volt battery.
3LOCKED PUMPMotor and/or pump misalignmentLine voltage low, less than approximately 150 VAC (normal operating range = 190 to 260 VAC)
Dragging motor and/or pumpAmperage above max amps at 10 Hz
Abrasives in pumpRemove and repair or replace as required
Low Insulation to GroundCheck line to ground with a megohmmeter
Are output leads to motor longer than 1000 feet?
(MonoDriveXT only)
INCORRECTLY WIREDMonoDrive onlyWrong resistance on DC test at start
Wrong resistance values on main and startCheck wiring, check motor size, and DIP switch setting, adjust or repair as needed
5OPEN CIRCUITLoose connectionOpen reading on DC test at start
Failed motor or drop cableCheck drop cable and motor resistance, tighten output connections, repair or replace as necesssary, use "dry" motor to check drive functions, if drive will not run and exhibits open
Wrong motorCheck ratings
Damaged controllerReplace controller
6OVER CURRENTWhen fault is indicated immediately after power-up, over current is due to short circuit. Check for loose connections, defective cable, defective splice or grounded motor.Amperage exceeded 50 amps on DC test at start or max amps during running
Incorrect output wiring, phase to phase short, phase to ground short in wiring or motor
If fault is present after resetting and removing motor leads, replace drive
When fault is indicated while motor is running, over current due to loose debris trapped in pumpCheck pump
7OVERHEATED DRIVEHigh ambient temperatureDrive heat sink has exceeded max rated temperature, needs to drop below 85 °C to restart
Direct sunlightFan blocked or inoperable, ambient above 125 °F, direct sunlight, air flow blocked
Obstruction of airflowReplace fan or relocate drive as necessary
(SubDrive300 only)
OVER PRESSUREImproper pre-chargeReset the pre-charge pressure to 70% of sensor setting. Reduce pressure setting well below relief valve rating. Use next size larger pressure tank.
Valve closing too fastVerify valve operation is within manufacturer’s specifications.
Pressure setting too close to relief valve ratingReduce system pressure setting to a value less than pressure relief rating.
RAPIDINTERNAL FAULTA fault was found internal to driveUnit may require replacement. Contact your supplier.
(SubDrive2W only)
OVER RANGEWrong hp/voltageVerify motor hp and voltage
(Values outside normal operating range)Internal faultUnit may require replacement. Contact your supplier.