Underload Sensitivity for
Shallow Wells
The SubDrive300 controller is configured at the factory to ensure detection of Underload faults in a wide variety of pumping applications. In rare cases (as with certain pumps in shallow wells) this trip level may result in nuisance faults. If the pump is installed in a shallow well, activate the controller and observe system behavior. Once the controller begins to regulate pressure, check operation at several flow rates to make sure the default sensitivity does not induce nuisance Underload trips.
If it becomes necessary to desensitize the Underload trip level, remove power and allow the controller to discharge. Once the internal voltages have dissipated, locate the DIP switch marked “SW1” at the lower right corner of the main circuit board. Use a small screwdriver (provided) to change Position 3 to the “ON” position to select the lower Underload sensitivity as shown in the chart below.
SW1 |
O N |
Configuration Switch
POS Underload Sensitivity
3 OFF | Normal (default) |
ON | Low (shallow wells) |
▲! WARNING
Serious or fatal electrical shock may result from contact with internal electrical components. DO NOT, under any circumstances, attempt to modify DIP switch settings until power has been removed and 5 minutes have passed for internal voltages to discharge!
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