Operation; Troubleshooting - Grundfos SP Series Installation And Operating Instructions Manual

Warning
Under no circumstances should the
pump be operated for any prolonged
period of time with the discharge
valve closed. This can result in
Caution
motor and pump damage due to
overheating. A properly sized relief
valve should be installed at the well
head to prevent the pump from
running against a closed valve.
Start the pump and test the system. Check and
record the voltage and current draw on each
motor lead.

5. Operation

The pump and system should be periodically
checked for water quantity, pressure, drawdown,
periods of cycling and operation of controls.
If the pump fails to operate, or there is a loss of
performance, refer to section 6. Troubleshooting
on p. 12.
12

6. Troubleshooting

The majority of problems that develop with
submersible pumps are electrical, and most of
these problems can be corrected without pulling
the pump from the well. The following chart
covers most of the submersible service work. As
with any troubleshooting procedure, start with the
simplest solution first; always make all the above
ground checks before pulling the pump from the
well.
Usually only two instruments are needed:
• a combination voltmeter/ammeter
• an ohmmeter.
These are relatively inexpensive and can be
obtained from most water systems suppliers.
Warning
WHEN WORKING WITH
ELECTRICAL CIRCUITS, USE
CAUTION TO AVOID ELECTRICAL
SHOCK.
It is recommended that rubber
gloves and boots be worn and that
care is taken to have metal control
boxes and motors grounded to
power supply ground or steel drop
pipe or casing extending into the
well.
Warning
Submersible motors are intended
for operation in a well. When not
operated in a well, failure to connect
motor frame to power supply
ground may result in serious
electrical shock.