Sun Pumps SCP 48-18-48Y BC - Manual (Page 21)

6. If the seventh LED, labeled “Fault Condition”, is on, this indicates a motor or ground fault fuse error. Check
the controller display for the type of fault. Check motor wiring and connections. If the screen displays “GF
FUSE OPEN” the ground fault fuse has been blown. Check your system for ground loops and replace the
fuse with a 500 VDC 1A rated fuse by pulling directly on the small rectangular fuse holder. Slide out the old
fuse and slide in a new one. Replace the fuse holder. If this does not solve the issue, contact Sun Pumps for
further assistance.
7. Check for proper dip switch settings on your controller. Switches 5, 6, and 8 must be in the off position for
proper operation.
8. Check for proper controller input voltage. A quick look at the controller display (PCC Controller Only) will
verify the array voltage. For the PCA controller you will need to use a DC volt meter. If the pump is not
running the display should be reading 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 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.
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 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.
PUMP DRAWS EXCESSIVE CURRENT
(More than the rating of the pump motor, 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 system, 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.