TROUBLE SHOOTING
If you find any trouble during operation of the pump,
please follow the guidelines to overcome some of the
troubles given below.
Fault
Probable cause
Possible Solution
Pump does not run
when the motor
starter is activated.
a. Supply failure or no power supply.
Check connections or restart the power
supply.
b. Main contacts in motor starter are not
making contact or the motor coils are
defective
Reconnect or replace contacts or magnetic
coil.
c. Pump or auxiliary circuits
protection
fuses blown.
Replace fuses.
d. Pump or piping system may be
obstructed causing a jam.
Clean the obstruction and restart pump.
e. Motor may have failed.
Replace the motor.
f. Motor protector or thermal relay has
tripped out.
Reset the motor or thermal protector.
g. Tripping of
anti-dry running protection.
Check the water level in the tank or the
water system pressure. If everything is in
order, check the protection device and its
connection cables.
Starter overload
trips immediately
when the power is
switched on.
a. Overload setting is too low.
Set the motor starter correctly.
b. The cable connection is loose or faulty.
Fasten or replace the cable connection.
c. One fuse is blown.
Replace fuse and try starting again.
d. Pump is jammed by an obstruction
Check and clean obstruction from system.
e. Contacts in overload are faulty.
Replace motor starter contacts.
f. The motor winding is defective.
Replace the motor.
g. Low voltage(Especially at peak time)
Check the power supply.
The pump starts
but, after a short
time, the thermal
protector trips out
or the fuses blow.
a. The voltage is not within the motor’s
operating limits.
Check the operating conditions of the
pump.
b. The control panel is situated in an
excessively heated area or is exposed to
direct sunlight.
Protect the control panel from heat sources
and from the sun.
c. A phase in the power supply is missing.
Check the power supply.
The pump starts up
but, after a
period of time, the
thermal protector
trips.
a. Worn out motor bearings causing motor
to overheat.
Replace motor bearings.
b. The pump’s delivery rate is higher than
the specified rate on the pump nameplate.
Partially close the isolating valve located
discharge side until the delivery rate
returns to within the specified limits.
c. There are obstructions inside the pump
or pumping system.
Disassemble and clean the pump and
piping.
d. Less viscous liquids may cause the motor
to work too hard and overload the motor,
causing the motor to overheat.
Check the actual power requirements
based on the characteristics of the liquid
being pumped, and replace the motor
accordingly.
