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10.4 Material recycling and discharging
Problem
Possible cause
Solution
Wrong supply voltage
Check that the supply voltage corresponds to the
value marked on the motor sign.
Restore power supply.
Note:
EC-fans: The error message
resets automatically. The device
restarts automatically without an
advance warning.
Wrong connection
Check the connections: see
on page 48 and the product
nameplate.
Break in coil or control circuit
If the switch is in the OFF position, there is a
bumbling noise. Check the slack line switches.
Check that the line switches close.
Mechanical failure
Check that the fan motor and fan blade rotate
freely. Check the bearing and lubrication.
Short circuit in coil
Can be indicated by a blown-out fuse. Replace
the motor.
One phase in motor may be broken Check the connection.
Voltage break
Blown-out fuses
Fan stops
Low voltage
Follow the voltage given in the product
nameplate. Check the connections.
Fan starts, then
stops
Failure in supply voltage
Check the loose connections, fuses and control
circuit.
Wrong fan motor type
Ask the supplier about a correct type of fan.
Too low voltage at fan motor
terminals because of voltage drop
Use higher voltage or a starter transformer.
Check the connections and the correct cable
size.
Fan does not reach
maximum speed
Broken rotor
Check for breaks in the short-circuiting ring.
Change the rotor or motor.
Too low voltage
Check the size of cables.
Motor takes high
amp
Too low supply voltage
Check the supply voltage.
Wrong rotation
direction
Wrong sequence of phases
Change the connection on the motor coupling or
from the switchboard.
Motor body or cooling openings
may be dirty or blocked up,
hindering proper motor ventilation.
Clean the motor and and ensure free air
circulation.
One motor phase may be open.
Check the connection.
Earth fault
Identify and repair.
Fan motor
overheating
Asymmetric supply voltage to
motor terminal
Check the cables and connections.
©
Alfa LU-VE, Rev-04
88
Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.