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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 fi rst
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 off-time possible
based on the recovery time of the well.
Figure 5: “Smart Reset” Well Recovery Time
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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Run Time (Min.)
Off Time (Min.)