Biral SUB6N [21/60] Summary of faults

Biral SUB6N [21/60] Summary of faults
10. Summary of faults
Faults
The submersible pump
does not start.
The fuses blow
when switching on.
Motor protection switch
(thermal relay) responds
following brief operation.
Submersible pump
delivery too low.
Possible causes
Mains switch open.
Motor voltage absent.
The dry-running protection provides
no release signal.
The overload protection
(three-phase motor) fitted
in the motor has responded
Incorrect fuse ratings.
Electrical insulation inadequate.
Supply cable or connection defective.
Junction box full of water.
Not all phases of the motor
receive full voltage.
Motor protection switch (thermal relay)
wrongly set.
Rotor of submersible pump blocked.
Mains voltage too high.
The submersible pump is silted up.
Sand concentration too high.
Temperature of switch cabinet
is too high.
Cavitation at inlet of suction branch
or in pump.
Motor rotates in wrong direction.
Non-return valve blocks
when half closed.
Pump worn out.
Pipe blocked.
Elimination
Switch on mains switch.
Check whether the fuses have blown
or the motor protection switch has
operated. Check that the mains
voltage is present.
Check the tightness of terminals.
Wait for restoration of the operating
conditions or check the function
of the dry-running protection.
Wait until the motor has cooled down.
Look for the cause of the overload.
Insert fuses of correct rating.
Measure the insulation resistance
with insulation test set or ohmmeter.
The specifications are listed
in point 6.1.
Return the motor to Biral if necessary.
Replace cable or renew connection
if necessary.
Replace junction box and cable.
Check whether all connections
on terminal side are tight.
Check that the supply voltage
is present in all phases.
Set motor protection switch
(thermal relay) as described in 6.5.
Send pump to Biral service centre
or notify Biral customer service.
Consult local power supply
authorities.
Check fitting position of submersible
pump and place pump higher.
Clean borehole, pump out sump.
Reduce delivery volume accordingly.
Protect switch cabinet from heat
and thermal influence.
Raise water level at suction branch.
Lower pump further if possible
(observe minimum distance from
floor).
Exchange two of the three phases.
Check non-return valve. If necessary
send pump to Biral service centre.
Send pump to Biral service centre.
Clean or replace pipe.
english
21

Содержание

Похожие устройства

Скачать