Sun Pumps SCB-10-150-120 BL - Manual (Page 15)

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. 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 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 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, 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 the Sun Pumps for further assistance.