Biral BM 1 Montage- Und Betriebsanleitung Seite 24

english
Fault
6. The pump runs,
but gives no water
7. The pump runs
backwards
when switched off
8. The pump runs
with reduced
performance
24
Cause
a) Pump inlet pressure too low
b) The suction pipe is partly clogged
by impurities
c) The foot or non-return valve
is stuck in its closed position
d) Leakage in suction pipe
e) Air in suction pipe or pump
a) Leakage in suction pipe
b) Foot or non-return valve defective
c) The foot valve is stuck in
completely or partly open position
a) Wrong direction of rotation
b) See 5.
Remedy
See 5. a)
See 5. b)
Remove and clean,
repair or replace the valve
See 5. c)
See 5. d)
See 5. c)
See 6. c)
See 6. c)
Three-phase pumps only:
Switch off the electricity supply
with the external circuit breaker,
and interchange two phases
in the pump terminal box.
See also section
8.2 Checking the direction of rotation.