Submersible Motor Pumps
(150 mm and above)
8
11. Trouble shooting
11.1 Motor
Motor could not start
Motor fails, fuses blown or motor tripped
Overload protection actuate after long operation time
Repeated starting of the motor
Motor is not cut off (automatic control is not in function) Applicable only to pressure booster pumps.
Possible causes
Remedies
•
Too low voltage / no voltage.
Retighten loose connections,
Contact electrical supply authority.
•
•
Motor winding or supply cable damaged.
Repair / replace motor, cable.
•
•
Fuses or automatic switches are not suitable Replace fuse or switch
•
Supply voltage is either too high or too low
Change either supply or Check the motor
than rated.
connections.
•
•
Failure of a phase (single phasing in 3 phase Rectify loose connections. Replace fuses.
motor).
Consult electrical authority.
•
Switchgear positioned in too warm place.
Protect switchgear from heat.
•
Control switch is not in function
Repair / replace the control device.
(level switch / level guard).
•
•
Leakage in the unit / faulty pressure gauge.
Trace leakage and seal it.
•
Contaminated filter, excessive wear in
Dismantle pump, clean & repair.
pumping unit.
•
Incorrect co-ordination of pump & pressure
Correct the co-ordination.
tank (applied to the booster pump).
Pump should be repaired to prevent such
•
Pump components are clogged.
incidents. The pumpset should not be idle for
a long time & should be operated at least
once in a week.
