Fault Finding - Grundfos SP Series Installation And Operating Instructions Manual

10. Fault finding

DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before you start any
work on the product.
- Make sure that the power supply cannot be
accidentally switched on.
DANGER
Toxic or radio active liquid
Death or serious personal injury
- If a pump has been used for a liquid which is
injurious to health or toxic, the pump will be
classified as contaminated.
DANGER
Magnetic field
Death or serious personal injury
- Do not handle the motor or the rotor if having a
pacemaker.
Fault Cause
1. The a) The fuses are
pump blown.
does not
run.
b) The ELCB or the
voltage-operated
ELCB has tripped.
c) No power supply.
d) The
motor-protective
circuit breaker
has tripped.
e) The
motor-protective
circuit breaker/
the contactor is
defective.
f) Starter device is
defective.
g) The control circuit
has been
interrupted or is
defective.
h) The dry-running
protection has cut
off the power
supply to the
pump due to low
water level.
i) The pump/
submersible drop
cable is defective.
Remedy
Replace the blown fuses.
If the new ones blow too,
check the electric
installation and the
submersible drop cable.
Cut in the circuit breaker.
Contact the power
supply company.
Reset the
motor-protective circuit
breaker (automatically or
possibly manually).
Check the voltage if it
trips again. If the voltage
is okay, see items 1 e)
1 h).
Replace the
or motor-protective circuit
breaker/ or the contactor.
Repair or replace the
starter device.
Check the electric
installation.
Check the water level. If
it is okay, check the
water level electrodes/
level switches (ERGO).
or the
Repair or replace the
pump or /cable.
Fault Cause
2. The a) The outlet valve is
pump closed.
runs but
b) No water or too
gives no
low water level in
water.
borehole.
c) The non-return
valve is stuck in
closed position.
d) The inlet strainer
is blocked.
e) The pump is
defective.
3. The a) The drawdown is
pump larger than
runs at anticipated.
reduced
performa
nce.
b) Wrong direction of
rotation.
c) The valves in the
outlet pipe are
partly closed
blocked.
d) The outlet pipe is
partly blocked by
impurities (ochre).
e) The non-return
valve of the pump
is partly blocked.
f) The pump and the
riser pipe are
partly blocked by
impurities (ochre).
g) The pump is
defective.
h) Leakage in the
pipeswork.
to
i) The riser pipe is
defective.
or
Remedy
Open the valve.
See item 3 a).
Pull out the pump and
clean or replace the
valve.
Pull out the pump and
clean the strainer.
Repair or replace the
pump.
Increase the installation
depth of the pump,
throttle the pump or
install a pump with a
smaller performance.
See section
6.6.4 Checking the
direction of rotation.
Clean or replace the
/or valves.
Clean or replace the
pipe.
Pull out the pump and
clean or replace the
valve.
Pull out the pump and
clean or replace it.
Clean the pipes.
Repair or replace the
pump.
Check and repair the
pipeswork.
Replace the pipe.
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