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9. TROUBLESHOOTING
PROBLEM
Pump does not run when
the motor starter is
activated.
Starter overload trips
immediately when the
power is switched on.
The pump starts but, after
a short time, the thermal
protector trips out or the
fuses blow.
The pump starts up but,
after a period of time, the
thermal protector trips.
POSSIBLE CAUSE
Supply failure or no power supply.
Main contacts in motor starter are not making
contact or the motor coils are defective
Pump or auxiliary circuits protection fuses
blown.
Pump or piping system may be obstructed
causing a jam.
Motor may have failed.
Motor protector or thermal relay has tripped
out.
Tripping of anti-dry running protection.
Overload setting is too low.
The cable connection is loose or faulty.
One fuse is blown.
Pump is jammed by an obstruction
Contacts in overload are faulty.
The motor winding is defective.
Low voltage (Especially at peak time).
The voltage is not within the motor's operat-
ing limits.
The control panel is situated in an excessively
heated area or is exposed to direct sunlight.
A phase in the power supply is missing.
Worn motor bearings causing motor to
overheat.
The pump's delivery rate is higher than the
specified rate on the pump nameplate.
There are obstructions inside the pump or
pumping system.
Less viscous liquids may cause the motor to
work too hard and overload the motor, caus-
ing the motor to overheat
REMEDY
Check connections or restart the power supply.
Reconnect or replace contacts or magnetic coil.
Replace fuses.
Clean the obstruction and restart pump.
Replace the motor.
Reset the motor or thermal protector.
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.
Set the motor starter correctly.
Fasten or replace the cable connection.
Replace fuse and try starting again.
Check and clean obstruction from system.
Replace motor starter contacts.
Replace the motor.
Check the power supply.
Check the operating conditions of the pump.
Protect the control panel from heat sources and
from the sun.
Check the power supply.
Replace motor bearings.
Partially close the on-off valve located
discharge side until the delivery rate returns to
within the specified limits.
Disassemble and clean the pump and piping.
Check the actual power requirements based on
the characteristics of the liquid being pumped,
and replace the motor accordingly.
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