A. Blocked base valve.
B. Rotor worn or obstructed.
C. Insufficient suction pipe diameter.
D.Make sure the rotation is in the right
direction.
A. Clean the base valve.
B. Replace the rotor or eliminate the
obstruction.
C. Replace the pipe with a wider one.
D. Invert two supply cables
8. The pump produces insufficient
flow.
A. Excessively low suction pressure.
B. Suction pipe or pump partly obstructed
with impurities.
B. Clean the suction pipe and the pump
9. The pump flow is not constant.
A. Loss of suction pipe
B. Base or retention valve faulty or
blocked partly open.
A. Eliminate the problem
B. Repair or replace the faulty valve.
10. The pump turns the opposite
way when turned off
A. Check that the pump and the pipes are
properly fixed.
B. The pump shakes.
C. Air in the pump or suction manifold
D. Pump alignment not correct.
A. Block the loose parts.
B. Reduce the suction height and control
the load losses. Open the suction valve.
C. Purge the suction pipes and the pump.
D. Repeat the indications of section 7.2.
11. The pump vibrates with noisy
operation.
Faults
Checks
Solutions
15- CONNECTION FOR MOTORS
ENGLISH
17
230 V
400 V
TRIANGLE connection
STAR connection
3~230/400 V
1~230 V
Line
Line
manual V-nox 2010_A5 21/12/10 11:00 Página 19
