Wilo SiFire EN Série Notice De Montage Et De Mise En Service page 54

English
10 Faults, causes and remedies
The operations indicated in the table below must
be carried out ONLY by expert personnel. Never
carry out any work without having first carefully
read and understood this manual. Never attempt
to carry out repairs of materials and equipment
without a fully and correctly understanding of this
one.
Faults
The control panel is off.
Motor does not start
Pump works, but does not supply water,
or has a low flow/height.
Motor fails to reach nominal speed
Non-operational pumps once started
Presence of voltage on motor carter
44
Causes
No power supply
Out-of-order fuses
Auxiliary circuit failing
No power supply
Short-circuit in winding
Control panel faulty/Wrong connections
Overload
Wrong direction of rotation
Excessive suction depth. Pump in cavita-
tion
Wrong diameter of the suction pipe and
valves Pump in cavitation
Air inlet in the suction line
Valves partially/totally closed
Worn pump
Pump rotor obstructed
Strainer/filters obstructed
Coupling between pump and worn
motor
Motor fails to reach nominal speed or has
vibrations
Pump bearings are worn or not oiled
Too low voltage at motor terminals
False contacts in the power contactor or
problem with the start-up device
Phase failure
False contacts in power supply cables
Winding to the earth or short-circuit
Incorrect sizing of power line
Insufficient voltage
Pump sizing
Contact between line cables and earth
Humid or old Insulation
Short-circuit between terminals and
external housing
If people do not have sufficient knowledge about
the product and the operating logic required by
specific standards relatives to fire extinguishing
systems, or if people do not have the technical
skills needed, contact Wilo to make regular main-
tenance checks.
Remedy
Make sure that the supply line is con-
nected and voltage is present.
Check and/or replace fuses. Check and/
or replace the control panel.
Check voltage of primary and secondary
circuits in the transformer. Check and/or
replace fuses of the transformer.
Check connections and electric control
panel.
Check windings of motor
Check connections
Check sizing of the supply line. Make
sure that the pump is not blocked.
Invert two of the motor supply phases.
Review calculations to suit pump NPSHr.
Review calculations to suit pump NPSHr.
Make sure that there are no leaks in the
suction line. Check the distance
between the suction points if several
pumps have been installed. Fit anti-vor-
tex plates.
Open the suction and discharge valves.
Check and repair.
Check and repair.
Check and repair.
Check and repair.
Check speed,
see above
Lubricate with lubricators.
Check power supply voltage, connec-
tions and the cross-section of the cables
in the power line.
Check and repair.
Check line, connection and fuses.
Check terminal fixing.
Dismantle the motor, repair or change it.
Check and replace.
Check power supply.
Remove the rotating parts then check.
Correct connections.
Wipe motor or re-wind it.
Check insulation between terminals and
carter.
WILO SE 12/2019