DAB KC Serie Instrucciones Para La Instalación Y El Mantenimiento página 24

FAULTS
4. Unstable pump performance.
5. The pump is working but not
supplying water.
6. The pump turns backwards
when power is turned off.
7. Pump working with reduced
performance.
ENGLISH
Error conditions
CHECKS
(possible causes)
A. Pressure at pump intake too
low.
B. Suction pipe partly clogged by
impurities.
C. Leak in the suction pipe.
D. Air in the suction pipe or in the
pump.
A. Pressure at pump intake too
low.
B. Suction pipe partly blocked by
impurities.
C. Foot valve or non return valve
blocked in closed position.
D. Leaks in the suction pipe.
E. Air in the suction pipe or in the
pump.
A. Leak in the suction pipe.
B. Faulty foot valve or non return
valve.
C. Foot valve completely or partly
blocked in open position.
A. Wrong direction of rotation.
B. See 4. A, B, C, D
21
REMEDIES
A. Check the pump suction
conditions.
B. Remove and clean the suction
pipe.
C. Remove and repair the suction
pipe.
D. Vent the suction pipe or the
pump. Check the pump suction
conditions.
A. See 4. A
B. See 4. B
C. Remove and clean, repair or
replace the valve.
D. See 4. C
E. See 4 D
A. See 4. C
B. See 5. C
C. See 5. C
A. Only for three-phase pumps:
Switch off the electric power
supply with the external circuit
switch and exchange two phases
in the terminal board.
See also paragraph
7.2 "Checking the direction of
rotation".