Underload Smart Reset
If a motor Underload fault condition occurs, the most likely cause is an overpumped or dry well. To allow the well to recover, the SubDrive300 controller will wait 30 seconds to 5 minutes, determined by duration of the previous run time, before restarting the motor. For example, the first time the fault occurs, the controller will wait 30 seconds before attempting to restart the pump. If the system would then run for 1 minute and an Underload fault recurs, the controller will wait 4 minutes before attempting to restart the pump. This schedule allows for the minimum
Figure 5: “Smart Reset” Well Recovery Time
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(Min.) | 5.0 |
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4.0 |
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Time | 3.0 |
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2.0 |
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Off |
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1.0 |
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| 0.0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
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Run Time (Min.)
Over-Temperature Foldback
The SubDrive300 controller is designed for full power operation in ambient temperatures up to 125°F (51°C) as long as the input voltage is kept at 230 VAC. Under extreme thermal conditions, the controller will reduce output power in an attempt to avoid shutdown. Full pump output is restored when the controller temperature cools to a safe level.
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