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is configured to accommodate a Normally Closed (N.C.) float switch; float switch closed = water
tank low = pump water or float switch open = water tank high = shut off pump.
4. With switch number 6 in the OFF position, the controller is configured to interface with
electrode water level sensors for a water level HIGH pump shutdown and a LOW water level pump
activation. With switch number 6 in the ON position, the controller is configured to interface with
electrode water level sensors for a water level LOW pump shutdown and a HIGH water level pump
activation.
The input and output voltage set-points are calibrated at the factory and typically will not require
end user adjustment for proper system operation. However, if system “fine tuning” is desired for
optimal performance, please refer to the adjustment procedures below.
INPUT VOLTAGE ADJUSTMENT
The purpose of this procedure is to adjust the voltage of the solar electric panel to its peak power
point and thus obtain maximum water delivery from the system. In a solar electric application, this
procedure should be performed with the solar electric panel at its normal operating temperature at
mid-day to match as close as possible the worst case maximum voltage operating point. On a
battery source system, it is not recommended to adjust the input voltage set-point.
1. With the system installed, controller properly configured and pumping water, turn the solar
electric panel away from the sun until the pump flow rate is reduced by approximately 50%. If this
is not possible then shade the panels slightly until the same results are obtained.
2. Connect an accurate DC volt meter to the pump side of the controller (L+ and L-).
3. Slowly turn the “Panel Input Voltage” trimmer located on the face of the controller until the
highest possible output voltage is obtained.
4. Return the solar electric panel(s) to their normal or unshaded position. The pump will then
operate at its maximum output.
NOTE: Counter Clockwise lowers input voltage and Clockwise increases input voltage.
OUTPUT VOLTAGE ADJUSTMENT
The purpose of this procedure is to adjust the output voltage of the controller to reduce the water
flow of the pump. Typically this not recommended as the PCA controllers are factory calibrated for
optimum voltage output for the SDS series of pumps.
A common case scenario as to when the controller might be readjusted for a lower voltage output
would be an installation where the static water level drops rapidly when the pump system is
performing at its peak, thus turning off the pump system. The low water level electrode located in
the well would detect this low water level. The well could take a long time recharge to a water level
high enough (as detected by the high water level electrode located in the well) to reactive the
pumping process. This scenario could cause the pump system to cycle on and off unnecessarily
through out the day and possibly reduce system water production as compared with the following
solution. The solution in this case would be to reduce the controller output voltage to the pump,
thereby reducing water flow to a level where the well can maintain the water level above the low
