AIM Manual
Electronic Maintenance » Electronic Controls (Page 64)
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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
| NUMBER OF FLASHES OR DIGITAL DISPLAY | FAULT | POSSIBLE CAUSE | CORRECTIVE ACTION |
| 1 | MOTOR UNDERLOAD | Overpumped well | Frequency near maximum with less than 65% of expected load, 42% if DIP #3 is “on” |
| Broken shaft or coupling | System is drawing down to pump inlet (out of water) | ||
| Blocked screen, worn pump | High static, light loading pump reset DIP switch #3 to “on” for less sensitivity if not out of water | ||
| Air/gas locked pump | Check pump rotation (SubDrive only) reconnect if necessary for proper rotation | ||
| SubDrive not set properly for pump end | Air/gas locked pump if possible, set deeper in well to reduce | ||
| Verify DIP switches are set properly | |||
| 2 | UNDERVOLTAGE | Low line voltage | Line voltage low, less than approximately 150 VAC (normal operating range = 190 to 260 VAC) |
| Misconnected input leads | Check incoming power connection and correct or tighten if necessary correct incoming voltage check circuit breaker of fuses, contact power company | ||
| Dragging or failed cooling fan | Disconnect fan. Re-apply system power. If 2-flash goes away, replace fan. If 2-flash continues, replace controller. Check fan with 9-volt battery. | ||
| 3 | LOCKED PUMP | Motor and/or pump misalignment | Line voltage low, less than approximately 150 VAC (normal operating range = 190 to 260 VAC) |
| Dragging motor and/or pump | Amperage above max amps at 10 Hz | ||
| Abrasives in pump | Remove and repair or replace as required | ||
| Low Insulation to Ground | Check line to ground with a megohmmeter | ||
| Are output leads to motor longer than 1000 feet? | |||
| 4 (MonoDriveXT only) | INCORRECTLY WIRED | MonoDrive only | Wrong resistance on DC test at start |
| Wrong resistance values on main and start | Check wiring, check motor size, and DIP switch setting, adjust or repair as needed | ||
| 5 | OPEN CIRCUIT | Loose connection | Open reading on DC test at start |
| Failed motor or drop cable | Check 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 motor | Check ratings | ||
| Damaged controller | Replace controller | ||
| 6 | OVER CURRENT | When 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 pump | Check pump | ||
| 7 | OVERHEATED DRIVE | High ambient temperature | Drive heat sink has exceeded max rated temperature, needs to drop below 85 °C to restart |
| Direct sunlight | Fan blocked or inoperable, ambient above 125 °F, direct sunlight, air flow blocked | ||
| Obstruction of airflow | Replace fan or relocate drive as necessary | ||
| 8 (SubDrive300 only) | OVER PRESSURE | Improper pre-charge | Reset 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 fast | Verify valve operation is within manufacturer’s specifications. | ||
| Pressure setting too close to relief valve rating | Reduce system pressure setting to a value less than pressure relief rating. | ||
| RAPID | INTERNAL FAULT | A fault was found internal to drive | Unit may require replacement. Contact your supplier. |
| 9 (SubDrive2W only) | OVER RANGE | Wrong hp/voltage | Verify motor hp and voltage |
| (Values outside normal operating range) | Internal fault | Unit may require replacement. Contact your supplier. |
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