Sun Pumps SCP 48-18-48Y BC - Manual (Page 20)

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Troubleshooting
Sun Pumps, Inc. is dedicated to its customers and will gladly help you trouble shoot any problems with your
system. However, especially during the busy summer pumping season, we may not be able to help you right
away. Using this trouble shooting guide as your first resource when your system is not working properly can save
you valuable time in getting your system fully functional. If at any time however, you are not comfortable
performing any of these tasks, or do not fully understand the system, it is better to call than to guess. Before
calling please go through the section below labeled “Before Calling Sun Pumps” and complete the steps
there.
CONTROLLER DOES NOT TURN ON
1. Check the LED’s on the face of the controller. The top LED, labeled “Power In”, should be on. This indicates
power is connected to the controller and the polarity is correct. If it is not on, verify that the controller is
properly wired, including polarity, and that the input terminals have at least 60 volts. Less than 60 volts at the
input terminals and the unit may show no signs of operation. If you do have at least 60 volts in the right
polarity, contact Sun Pumps for further assistance.
2. If the expected voltage is not present, disconnect the panels from the controller using the disconnect, and
check any fuses and breakers in the system. Replace blown fuses and reset tripped breakers.
3. If there are no blown fuses and no tripped breakers, check the open circuit voltage of your array. If the open
circuit voltage is not correct trouble shoot the array to find the problem. If the open circuit voltage is correct,
call Sun Pumps for further assistance.
CONTROLLER TURNS ON BUT PUMP DOES NOT RUN
1. Make sure the On/Off switch is in the up position. (On)
2. The second LED is labeled “Run”. This indicates the pump is running. If it is on, go to the bore hole and
listen for the sound of the motor. Check for breaks in the pipe. If you cannot find a problem call Sun Pumps
for further assistance.
3. Check the fourth LED, labeled “RS Stop”; this is the remote switch shutdown indicator. If it is on, the remote
circuit or low water cutoff circuit is preventing the controller from running the pump. Set the #1 and #2 dip
switches to off and disconnect the remote switch and low water cutoff. If the pump starts, troubleshoot the
remote switch and low water cutoff individually. If the pump does not start and the LED is still lit, call Sun
Pumps for further assistance.
4. Check the fifth LED, labeled “Low Power”; this is the low power shutdown indicator. If it is on, the
controller detected a low power or low water condition. The low power shut down is a common occurrence
on days which have clouds which block the sun momentarily. First check the input voltage to the controller.
This will be shown on the LCD screen called DC BUS. Verify that this exceeds the minimum voltage in
Table 1. If it does not meet or exceed the minimum voltage, you do not have enough power to start your
pump.
Note: To accurately trouble shoot this feature there should be absolutely no clouds blocking the sun
at any time during the following tests. If you have enough input voltage, turn the controller off then on again
to reset this fault. If the low power or low water condition still exists then the controller will start but shut
down again. Verify power using the LCD screen. Wait for the screen to cycle to the power reading and turn
on dip switch # 7. Note the number underneath the “LP” on the display. Cycle the pump off then on and
watch the power reading. If the power reading goes higher than the LP set point, the controller is shutting
down due to a low water condition. If the number is not higher than the set point, skip to step 7. Check to
verify the pump is not running out of water. If your pump is not running out of water, call Sun Pumps for
further assistance.
5. If the sixth LED, labeled “Over Current” is on, the controller has exceeded its current limit and shut down.
Turning the controller off then on again will reset this fault. If the controller continues to need high current, it
will turn itself off again. Check the pump for a short to ground using an ohm meter and call Sun Pumps for
further assistance.