Sun Pumps SJT10-120BL - Manual (Page 15)

4.0
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 30 volts. Less than 30 volts at the input terminals and the unit may show no signs of operation. If you
do have at least 30 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 switch, 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. Turn the switch off then back on. If the light goes out and 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. 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.