Sun Pumps PCC-BT-M2 - Manual (Page 14)

6. 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. This light may flash in normal operation if the controller output
is equal to the current setpoint. If both the sixth and seventh LED are lit, the controller has detected a
motor fault too many times in the day and has shut down for the day. Cycle the on/off switch and
verify the LP is properly adjusted.
7. If only the seventh LED, labeled “Fault Condition”, is on, this indicates a motor or controller fault.
Check the controller display for the type of fault. Check motor wiring and connections. If you cannot
solve the issue, contact Sun Pumps for further assistance.
8. Check for proper dip switch settings on your controller. Only one current setting should be on for
normal operation.
9. Check for proper controller input voltage. A quick look at the controller display will verify the array
voltage. If the pump is not running the display should be reading the array open circuit voltage, (Voc).
Verify that this voltage is below 300 volts. 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 display 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. If you cannot setermine
the failure, call SunPumps for further assistance.
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 coming out of the controller. Look at the LCD screen and read the
voltage, current and power. 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 the two wires are reversed the motor will be running in reverse.
This will affect some types of pumps and 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.
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, bad connections or faulty splices.
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 the Sun Pumps for further assistance.