PYD Electrobombas VERTINOX Serie Manual De Instalación Y Mantenimiento página 35

OPERATING AND MAINTENANCE MANUAL
VERTICAL ELECTRIC PUMP VERTINOX SERIES
The pumped flow is not
is not constant
Pump works but does not
deliver water
Pump rotates backwards
when switched off
Leakage at shaft seal
Noise
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- Low pressure at pump inlet (cavitation)
- Suction partially blocked
- Pump is rotating in air
- Suction blocked by impurities
- Foot valve or non-return valve blocked or in
closed position
- Leak in suction pipe
- Air in suction pipe or pump
- Motor rotates in the opposite direction
- Leakage in suction line
- Foot valve/anti-return valve defective
- Defective shaft seal
- Cavitation in the pump
- Pump does not rotate freely due to inco-
rrect shaft position
- Ratio between system head and pump
capacity too low
- Frequency inverter does not work
- Check suction conditions
- Clean suction tube
- Check suction conditions
- Clean the suction
- Repair foot valve or non-return valve
- Repair suction pipe
- Check suction conditions
- Reverse direction of rotation
- Repair suction pipe
- Repair foot valve/anti-return valve
- Replace shaft seal
- Check suction conditions
- Adjust pump shaft
- Upgrade the system or select a more
pump or select a more suitable pump
- Check operation of the frequency
converter
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