DAB KVC 15/30, Инструкция по установке и обслуживанию

Страница: 19 / 96

ENGLISH
17
−
Check the state of the bearings.
Change any worn bearings.
−
Check the motor rotation speed.
The pump does not deliver.
−
Check priming.
−
On three-phase motors, check that the
direction of rotation is correct.
Invert the connection of two supply wires.
−
Difference in suction level too high.
−
The diameter of the intake pipe is insufficient
or the horizontal stretch is too long.
Replace the intake pipe with one with a larger
diameter.
− Foot valve or intake pipe blocked.
Clean the foot valve and the intake pipe.
The pump does not prime.
−
The intake pipe or the foot valve is taking in
air.
Check the suction pipe, repeat the priming
operations.
− Check the slope of the suction pipe.
Correct the inclination of the intake pipe.
The pump supplies insufficient flow.
− Foot valve or impeller blocked.
Remove clog. Replace the impeller if weared
down.
− The diameter of the intake pipe is insufficient. Replace the pipe with one with a larger
diameter.
−
Check that the direction of rotation is correct. Invert the connection of two supply wires.
The pump flow rate is not constant.
−
Intake pressure too low.
−
Intake pipe or pump partly blocked by
impurities.
Remove clog.
The pump turns in the opposite direction
when switching off.
−
Leakage in the intake pipe.
−
Foot valve or check valve faulty or blocked in
partly open position.
Repair or replace the faulty valve.
The pump vibrates and operates noisily.
− Check that the pump and/or the pipes are
firmly anchored.
− There is cavitation in the pump.
Reduce the intake height or check for load
losses.
− The pump is running above its plate
characteristics.
Reduce the flow rate.
−
The pump is not turning freely.
Check the state of wear of the bearings.