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Underload Sensitivity for
Shallow Wells
The SubDrive300 controller is confi gured 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 fl ow 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.
▲ 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!
POS Underload Sensitivity
3 OFF Normal (default)
ON Low (shallow wells)
SW1
O
N
Configuration Switch