Troubleshooting - Pentair PVM Series Original Instruction Manual

CHAPTER 10

TROUBLESHOOTING

PUMP DOES NOT RUN WHEN THE MOTOR STARTER IS ACTIVATED.
• Supply failure or no power supply =
Check connections or restart the
power supply.
• Main contacts in motor starter are not
making contact or the motor coils are
defective =
Reconnect or replace contacts or
magnetic coil.
STARTER OVERLOAD TRIPS IMMEDIATELY WHEN THE POWER IS SWITCHED ON.
• Overload setting is too low =
Set the motor starter correctly.
• The cable connection is loose or
faulty =
Fasten or replace the cable
connection.
THE PUMP STARTS BUT, AFTER A SHORT TIME, THE THERMAL PROTECTOR TRIPS OUT OR THE FUSES BLOW.
• The voltage is not within the motor' s
operating limits =
Check the operating conditions of
the pump.
THE PUMP STARTS BUT, AFTER A PERIOD OF TIME, THE THERMAL PROTECTOR TRIPS.
• Worn motor bearings causing motor to
overheat =
Replace motor bearings.
• The Pump' s delivery rate is higher
than the specified rate on the pump
nameplate = Partially close the on-off
valve on the discharge side of the
pump until the delivery rate is within
PUMP RUNS BUT NO WATER IS DELIVERED
• Pump is not primed with liquid =
Fill the pump with the liquid to be
pumped.
• The pump, suction or discharge pipes
are blocked by solids in the liquid being
pumped =
Clean the pump, suction or discharge
pipe.
THE PUMP CAPACITY IS NOT CONSTANT.
• The pump draws in air or the inlet
pressure is too low = Improve the
suction conditions.
THE SYSTEM'S GENERAL PROTECTION CUTS IN.
• Short circuit = Check electrical system.
• Pump or auxiliary circuits protection
fuses blown =
Replace fuses.
• Pump or piping system may be
obstructed causing a jam =
Clean the obstruction and restart the
pump.
• Motor may have failed = Replace the
motor.
• One fuse is blown = Replace fuse and
try starting again.
• Pump is jammed by an obstruction =
Check and clean obstruction from the
system.
• Contacts in overload are faulty =
Replace motor starter contacts.
• 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.
the specified limits.
• There are obstructions inside
the pump or pumping system =
Disassemble and clean the pump and
piping.
• More viscous liquids may cause the
pump to overload the motor, causing
• The foot or check valve is blocked or
has failed =
Replace the foot or check valve.
• The suction pipe leaks =
Repair or replace the suction pipe.
• Air in the suction pipe or pump =
Remove trapped air from system.
• The pump or the suction side of the
piping system partly blocked by foreign
bodies =
Clean the pump or suction pipe.
ORIGINAL INSTRUCTION
• Motor protector or thermal relay has
tripped out =
Reset the motor or thermal protector.
• Tripping of 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.
• The motor winding is defective =
Replace the motor.
• Low voltage (Especially at peak time) =
Check the power supply.
• A phase in the power supply is missing
= Check the power supply.
the motor to overheat =
Check the actual power requirements
based on motor, the characteristics of
the liquid being pumped, replace the
motor accordingly.
• Motor operating in wrong direction
(three-phase motor) =
Change the direction of rotation of the
motor by reversing motor connections.
EN
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