Sun Pumps MTR BLM-SB-073S-60 - Manual (Page 18)

4. 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.
5. If the seventh LED, labeled “Fault Condition”, is on, this indicates a motor or ground
fault fuse error.. Check motor wiring and connections. Also check the ground fault
fuse, it may have 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.
6. Check for proper dip switch settings on your controller. Switches 5, 6, 7, and 8 must
be in the off position for proper operation.
7. Check for proper controller input voltage. If the pump is not running, the input
voltage should be 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 measured 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). A single bad module can drop the voltage and
current of an entire string of panels.
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 going into the controller by measuring the
voltage and current. 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 Sun Pumps for further assistance.