Overview Of Faults - Biral FEX Instructions D'installation Et D'entretien

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Overview of faults

Before performing all maintenance, completely disconnect the pump from the
power supply and secure it against switching on again.
Pump does not start.
The pump starts up briefly,
but the motor protection
switch triggers.
The pump does not deliver
the required pump height.
The power supply to the motor is
interrupted.
The control system is switched off.
The thermal relay has responded.
The fuses may have popped out due
to overload operation.
Phase failure
The thermal motor protection
switches have been triggered, are
connected incorrectly, or cannot be
acknowledged.
The motor does not receive full
voltage in all phases.
The thermal relay/motor protection
switch is set to a value that is too
small.
The motor has too little or no insula-
tion resistance.
The power consumption is not even-
ly distributed across all phases
Impeller is clogged, blocked, or
damaged.
Pumped medium is too viscous.
Stop valves in the suction or pres-
surised line are closed or blocked.
The non-return valve is partially
blocked.
The suction/pressurised line is
blocked.
english
Check the fuses. A circuit breaker
may have interrupted the electric
circuit.
Switch on the control system.
Locate and resolve the cause. Check
the adjustment or re-adjust the
thermal relay.
Locate the cause and replace the
fuses.
Resolve the causes and check the
mains connections.
Allow the pump to cool off. Connect
the thermal motor protection switch
correctly. Disconnect the pump from
the mains (main switch off, discon-
nect the plug)
Check the fuses of the switching
system.
Check the adjustment and readjust
if necessary.
Disconnect the power supply to
the motor and check the insulation
resistance.
Check the power consumption of
the phases. Greatest permissible dif-
ference ± 5% from the mean value.
Also see section 8.1.
If no results are identified in the
electrical checks, pull the pump out
of the shaft and check whether the
impeller can be turned.
Check the calibration of the motor to
the pump.
Open or release the stop valves.
The valve must be freed up. If an
external lever is available, move it
back and forth several times.
Rinse and clean the lines using a
high-pressure hose.
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