Excess current.
2
Forward rotation.
Check the current value when the discharge valve is fully opened.
Normal.
Pump head is too low
and water volume is
excessive.
Abnormal.
Reverse rotation.
Check the direction of rotation.
Try to rotate the impeller manually.
Light.
Heavy.
Check the panel and
power supply.
Disconnection.
Breaker off.
Blown-out fuse.
Defective control panel.
Operating condition not
ready.
Check the protective
device condition.
Reset protective
device.
Check the level switch
and pressure switch.
Improper insulation.
Burn-out of the motor.
Damage to the motor
bearing.
Rotate only the motor
manually.
If it is heavy, it is out of
order.
Rotate only the pump
manually.
Unable to start.
1
Defective electrical
system.
Improper connection
Loose contact.
Insufficient voltage
(voltage measurement).
If it is heavy, it is a
defective pump.
Deformation of pump
impeller.
Foreign particles
caught.
Contact of the rotating
section.
Rotate the pump
manually and check in
the same way as
Adjust the valve
opening so that the
current value is normal.
The specific gravity of
the liquid is too high.
Rewire two phases of
the three phase.
Disassembly and inspection.
Unable to start.
1
18
TROUBLESHOOTING
