5-1
5. Operation
5.1
Precautions for starting the fan
(1) Turn on and off the power switch once or twice to check that the fan runs without any problems
such as abnormal noise or vibrations. At that time, also check the direction of rotation.
If a three-phase powered fan rotates reversely, swap two of the three power wires.
Warning
Be sure to turn off the main power before changing the wiring of the fan.
Otherwise, it may lead to an electric shock.
(2) Turn on the power and watch the unit until it reaches full speed.
Check for any vibrations and noise at each section of the fan.
Also check that the electric current at the motor shows a normal value. Pay special attention to
blowing of cold air because the current value becomes higher in that case compared with blowing
of air at the room temperature.
5.2
Precautions during the operation
Warning
When to stop the fan operation, be sure to turn off the main power.
The fan may start suddenly when power is restored, which expose the
personnel to great danger.
(1) Frequent starting and stopping the fan quickly damages it.
As a guide, limit the startup frequency to about six times or less per hour.
5.3
Precautions for long-term shutdown
(1) Ensure to protect the motor and cable connections against moisture.
(2) Before running the fan after a long period of shutdown, inspect all the parts of the fan.
Warning
If you leave the fan unused for a long time, be sure to turn off the main
power.
