Pentair PVM Serie Instrucciones De Funcionamiento página 12

EN
ORIGINAL INSTRUCTION
THE PUMP ROTATES IN THE WRONG DIRECTION WHEN SWITCHED OFF.
• The foot or the check valve has failed. =
Check and replace check valve.
THE FREQUENCY OF PUMP START-UP IS TOO HIGH.
• Leakage in the foot valve, check valve
or system.
Repair or replace the components.
VIBRATION AND NOISE.
• Cavitation = Reduce the required flow
or improve the operating conditions of
the pump (suction conditions, head,
flow resistance, liquid temperature,
viscosity, etc.).
10
• Leakage in the suction pipe.
Repair or replace the suction pipe.
• Ruptured membrane or no air pre-
charge in surge tank.
See relevant instructions in surge
tank' s manual.
• b. Make sure that pump and motor
shafts are properly aligned. = Adjust
the pump and/or motor shafts.
• Worn motor bearings. = Replace the
bearings or the motor.
• d. Operation with frequency converter.
Consult a qualified engineer form the
supplier of the frequency converter.
• Check vibration and noise damping
devices. Replace vibration & noise
dampers, if worn.