Sun Pumps SIJ 2.2-1300P-135 BL - Manual (Page 16)

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. 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. Turn the blue pot labeled “LP Adj” all the way counter-
clockwise. Cycle the pump off then on. If the pump does not shut down, the low water cutoff was causing the
error. If you want to use this feature, readjust the low water cutoff as seen earlier in this manual. If the does
not run properly, 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. Verify the nominal voltage of your array. If the calculated Vmp for your array is
higher than 200 V, the controller may go into over current. Remove one series panel from each string and try
again. Check the pump for a short to ground using an ohm meter and call Sun Pumps for further assistance.
6. Check motor wiring and connections. Also check the ground fault fuse, it may have been blown.
7. Check your system for ground loops and replace the fuse with a 500 VDC 1A rated fuse. If this does not solve
the issue, contact Sun Pumps for further assistance.
8. Check for proper dip switch settings on your controller. Switches 5, 6, 7, and 8 must be in the off position for
proper operation.
9. Check for proper controller input voltage. If the pump is not running, the input voltage should be the array
open circuit voltage, (Voc). Verify that this voltage is below the maximum input voltage allowed for your
controller (model dependent see Table 1). Check the Voc on the label on the back of the solar modules and
multiply this figure times the number of modules that are connected in series. This number should be + - 10%
of the measured reading. If it is not then confirm all electrical terminations are tight and secure. Use a DC volt
meter to check each solar module for proper open circuit voltage (Voc). One bad module will drop the voltage
on the complete series string.
PUMP IS RUNNING BUT THE OUTPUT IS LOW
1. Make sure you have full sun light at midday, that there are no clouds and no shadows on any part of the array.
Then verify power going into the controller by measuring the voltage and current. Check this against the pump
chart for your specific application.
2. If the power is correct for your pump model and array size then make sure the pump wires are connected to the
proper terminals. If two wires are reversed the motor will be running in reverse. It may still pump but not at the
full rated output.
3. If the wires are correct verify that your system does not have any leaks where water can be lost. If you cannot
determine the problem, contact Sun Pumps for further assistance.
4. Make sure the water in the well is not drawing down past the suction capability lift of the pump .
5. Check the suction screen on the foot valve to see if it is plugged.
6. Make sure the hole in jet nozzle is not plugged. (Part No. 41459)
PUMP DRAWS EXCESSIVE CURRENT
(More than the rating of the pump, but less than the rating of the
controller)
1. Check wiring diagram for proper connection.
2. Check for skinned wires or faulty underwater splice.
3. Check for locked motor armature. With the pump out of the well, remove the pump end from the motor (if this
is not feasible skip this step and contact Sun Pumps). Allow the controller to attempt to start the motor. If the
motor still does not run, contact Sun Pumps for further assistance.