English (GB)
31
3.
The pump does
not stop.
a)
The pump is not able to
empty the pit to the stop
level.
Check the following and, if necessary, take corrective
action:
• Is the pipe connection tight?
• Is the propeller or impeller clogged?
• Are the valves open?
b)
The level-sensing
equipment is defective.
• Clean the stop sensor.
• Check the contactor. If the contactor is defective,
replace it.
• Replace the defective components.
c)
The stop level is set too
low.
Increase the stop level.
4.
The pump
starts, stops
and starts in
rapid sequence.
a)
The pump starts due to
backflow which fills the pit
to the start level again.
Check the following and, if necessary, take corrective
action:
• Is the distance between the start and stop level
too small?
• Are the valves, if any, OK?
• Does the non-return valve function correctly?
b)
The control voltage is
lower than the rated
control voltage.
Check the following and, if necessary, take corrective
action:
• Is the contactor connection OK? If not, restore
correct contactor connection.
• Check that the voltage in the starting circuit is OK
in relation to the rated voltage when the pump is
starting (check the voltage drop).
Fault
Cause
Remedy
