5-1
5. Operation
5.1 Precautions in test run
Warning
Be sure to install a belt guard and a shaft coupling guard before
operation if the unit is equipped with them.
(1) Close the damper and turn the unit ON and OFF once or twice to confirm that the unit is operating
properly without any unusual noise or vibrations. At that time, check the rotation direction of the
fan. If the fan rotates in the reverse direction, swap two of the three wires of the power supply
cable.
Warning
Be sure to turn off the main power before changing the wiring of the
fan.
(2) Turn on the power, and watch the unit carefully until it reaches full speed.
At that time, carefully check for unusual noise, vibrations, current, or any other abnormal
condition.
(3) Start the continuous operation, and gradually open the damper.
In order to check the condition of each part, keep the fan running at a low flow rate (light load) for
20 to 30 minutes.
At that time, ensure that the fan does not run at a rate where surging may occur.
(4) Gradually open the damper until the fan reaches the full load operation.
Keep it running under this condition for one to three hours, and check the temperature, vibrations
and noise at each section of the fan.
In addition, check that the motor current value is normal.
In particular, note that the (electrical) current value of the models that handle high temperature
gasses increases during the operation at room temperature.
The bearing temperature may become slightly higher than usual for about one to two hours after
the start of operation. If there are no errors in the machine, however, the temperature stabilizes
thereafter.
(5) If the model handles high temperature gasses, misalignment may be caused by thermal
expansion after the start of stable operation. Therefore, stop the operation once to check the
alignment when the temperature has risen sufficiently after the start of operation.
Warning
Do not touch the body of the fan or the duct if the temperature of the
gas is high. Otherwise, it may cause burns.
Do not place any combustibles near the unit.
Note
When the bearing is cooled by air-cooling method, secure a sufficient
space around the air-cooling parts (such as heat fins and heat sinks) so
that their heat radiation is not blocked by lagging or the like.
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