Faults, Causes And Remedies - Wilo FireSet UL FM Einbau- Und Betriebsanleitung

English
DANGER! Risk of fatal injury!
Avoid turning on the diesel pumps if exhaust
smoke pipes were not connected towards out -
side the room.
CAUTION! Risk of environmental pollution!
During controls and refilling, avoid oil leakage
from the motor or diesel fuel from the tank dur -
ing checks and refilling. Use appropriate protec -
tion and implement the necessary precautions.
DANGER! Risk of fatal injury!
Risk of unintended start. Avoid maintenance
operations on the FireSet if the automatic mode
is switched on.
Faults
The switchgear is off.
Motor does not start
Pump works, but does not supply
water, or has a low volume flow/
delivery head.
Motor fails to reach nominal speed
18
Causes
No power supply
Out-of-order fuses
Auxiliary circuit failing
No power supply
Short-circuit in winding
Switchgear faulty/Wrong connections
Overload
Wrong direction of rotation
Excessive suction depth. Pump in cavi -
tation
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 lubri -
cated
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

10 Faults, causes and remedies

The operations indicated in the following table
must ONLY be carried out by qualified 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 having fully and correctly
understood the manual.
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.
Remedies
Make sure that the supply line is connected and
voltage is present.
Check and/or replace fuses. Check and/or
replace the switchgear.
Check voltage of primary and secondary cir -
cuits in the transformer. Check and/or replace
fuses of the transformer.
Check connections and electric switchgear.
Check windings of the motor.
Check the 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's NPSHr.
Review calculations to suit pump's 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-vortex 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, connections, and
the cross-section of the cables in the power
line.
Check and repair.
Check line, connection, and fuses.
Check terminal fixation.
Dismantle the motor, repair or change it.
WILO SE 08/2019