Troubleshooting - FLYGT PX SERIE Instrucciones De Instalacion Y Uso

8. Troubleshooting

DANGER
RISK OF
ELECTRIC SHOCK
PROBLEM
1. The pump does not
start
2. The pump does not
deliver or delivers a re-
duced or irregular flow
3. The pump vibrates
and is noisy
4. 4. The overload protec-
tor steps in:
- 4A accidentally
- 4B systematically
5. The pump rotates in
reverse when it is
stopped
Make sure the pump is disconnected from the mains before performing any
maintenance operations
PROBABLE CAUSE
A) No mains voltage
B) Blown fuses:
B1) because they are inadequate
B2) because the motor or the power
supply cable are short-circuited
C) Overload protection previously ac-
tivated
A) Piping obstructed or valve jammed
B) Pump not primed because it has
not been filled, or because of
faulty seal on suction piping or foot
valve (Caution: the mechanical
seal may have been seriously
damaged)
C) Difference in level and/or exces-
sive suction flow resistance
D) Incorrect rotation direction (3-
phase motors only)
E) Air in suction pipe or pump
A) The pump is cavitating
B) Worn motor or support bearings
C) Foreign bodies between fixed and
rotating parts of pump
A) See 3C
B) Temporary lack of a phase
A) Incorrect setting
B) Pump delivery is higher than rated
C) Dense viscous liquid
D) See 3B
A) Leek in the suction pipe
B) Faulty foot valve or check valve
C) Air in suction pipe
POSSIBLE REMEDIES
A) Supply electrical power
B1) Replace the fuses with suit-
able ones
B2) Repair the motor or replace
the cable
C) Reset the protector (if it steps in
again, see problem 4)
A) Dismantle and clean or replace
B) Fill the pump with liquid after
checking the seal on the suction
pipe and foot valve, and the in-
tegrity of the mechanical seal.
C) Reduce the difference in level
Use a larger diameter pipe
Clear the foot valve
Replace the foot valve with a larg-
er capacity valve
D) Invert two power supply wires on
the terminal board or starter (sec-
tion 6)
E) Bleed the air
A) Choke the flow
- See probable cause 2C
B) Replace the bearings
C) Clean
A) Set to the rated current
B) Close the delivery valve until the
flow rate falls within the rated value
C) Determine the actual power re-
quired and then replace the motor
A) Repair or replace
B) Replace faulty foot valve
C) Bleed the air
en
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