POSSIBLE REASONS AND TROUBLESHOOTING
Problem
Possible reasons
Troubleshooting
The fan does not get started. No power supply.
Check the automatic circuit breaker. Check the
electric connections.
Jammed motor.
Carefully check the fan impeller for possible seizure
and eliminate it, if necessary. If the impeller is in
order, replace the electric motor.
The automatic breaker
activates upon fan start-up.
Short circuit in the fan or the electric circuit
between the fan and the automatic circuit
breaker.
Eliminate the cause of a short circuit.
Excessive current consumption due to an
overload in the electric mains.
Eliminate the cause of excessive current
consumption.
Improper fan starting method.
Use a soft starter or frequency converter to start the
motor (see “Asynchronous electric motor starting
methods” in the “Connection to power mains”
section).
Improper automatic circuit breaker.
Re-select the automatic circuit breaker in
accordance with the current regulations and
equipment specifications.
The installed automatic circuit breaker is of poor
quality or its actual performance falls short of
the rated values stated by the manufacturer.
Re-select the automatic circuit breaker by choosing
a unit which successfully passed commutation
and load tests and has a technical compliance
certificate.
The selection should be limited to the top five
foreign switching equipment manufacturers.
The fan fails to reach the
required rotation speed due
to serious overheating of the
fan motor.
Fan motor overloaded.
Eliminate the overload.
Improper fan starting method.
Use a soft starter or frequency converter to start the
motor (see “Asynchronous electric motor starting
methods” in the “Connection to power mains”
section).
The fan motor runs at
overload capacity with
current consumption in
excess of the rated value.
Wrong motor phasing. The impeller rotates in
the opposite direction of the arrow on the fan
casing.
If necessary, change the impeller rotation direction
by changing the phase sequence on the electric
motor terminals.
The fan supplies more air
than expected.
Wrong choice of the fan.
Replace the fan with a unit of proper standard size.
centro-Jet
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