Maintenance – Electronic Products
SubMonitor
SubMonitor Troubleshooting
FAULT MESSAGE
PROBLEM/CONDITION
POSSIBLE CAUSE
SF Amps Set Too High | SF Amps setting above 359 Amps. | Motor SF Amps not entered. | |
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Phase Reversal | Reversed incoming voltage phase sequence. | Incoming power problem. | |
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| Normal line current. | Wrong SF Max Amps setting. | |
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| Over pumping well. | |
Underload |
| Clogged pump intake. | |
| Closed valve. | ||
| Low line current. | ||
| Loose pump impeller. | ||
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| Broken shaft or coupling. | |
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| Phase loss. | |
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| Normal line current. | Wrong SF Max Amps setting. | |
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Overload |
| High or low line voltage. | |
| Ground fault. | ||
| High line current. | ||
| Pump or motor dragging. | ||
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| Motor stalled or bound pump. | |
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| High or low line voltage. | |
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| Motor is overloaded. | |
| Motor temperature sensor has detected excess | Excessive current unbalance. | |
Overheat | Poor motor cooling. | ||
motor temperature. | |||
| High water temperature. | ||
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| Excessive electrical noise | |
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| (VFD in close proximity). | |
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| Current difference between any two legs | Phase loss. | |
Unbalance | Unbalanced power supply. | ||
exceeds programmed setting. | |||
| Open delta transformer. | ||
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Overvoltage | Line voltage exceeds programmed setting. | Unstable power supply. | |
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Undervoltage | Line voltage below programmed setting. | Poor connection in motor power circuit. | |
Unstable or weak power supply. | |||
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| Power has been interrupted too many times in a | Chattering contacts. | |
False Starts | Loose connections in motor power circuit. | ||
10 second period. | |||
| Arcing contacts. | ||
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