Troubleshooting
User Manual Chemical centrifugal pumps with mechanical seal V080716
32
Impeller damaged or out of
balance
Pump is in cavitation
Increase the NPSH
available
.
Electric motor of the
product is running
too hot
Air cooler is defect or
blocked
Cooling air inlet and outlet
is blocked
Clean the cooling air inlet and
outlet with compressed air.
Rotating parts are blocked
Clean the product.
Product is overloaded
Check the specifications of the
liquid and the product.
Safety protection
switch switches
motor off
Air cooler is defect or
blocked
Replace the air cooler or clear
the blockage.
Cooling air inlet and outlet
blocked
Clean the cooling air inlet and
outlet with compressed air.
Rotating parts are blocked
Clean the pump.
Product is overloaded
Check the specifications of the
liquid and the product.
Ambient temperature too
high
Safety protection switch is
not correctly adjusted
Motor speed is too low
Wrong frequency.
Bearings of the product are
worn or jammed
Replace the bearings.
Motor does not run on 3
phases
Flow rate too low or
no discharge
pressure
Too much resistance in the
suction and discharge line
Valves in suction and
discharge line are closed
Open the valves.
Strainer at the suction side
is clogged
Clean the strainer.
Impeller of the product is
worn
Replace the impeller.
Crystalized liquid blocks the
pump
Clean the product.
Motor speed too low
Wrong frequency.
Problem
Possible cause
Solution