Sun Pumps MTR BLM-SB-103S-120Y - 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 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 not 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.