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4.3.2 Electric
wiring
•
The electric wiring of the blower must be installed by a qualified electrical engineer, as per
the “electrical equipment technical standards” and the “extension rules.”
•
Confirm the power supply specified on the product nameplate affixed to the side surface of
the main body and then use the power supply for this blower. Using a power supply other
than that specified on the nameplate to operate this blower is dangerous and may cause a
failure.
•
Select an earth leakage breaker or breaker of the power supply appropriate for the current
at the time of startup.
•
Ground the blower to prevent electric shocks.
•
Also read the Operating Instructions of the electric motor.
•
Install electric wiring to rotate the blower in the correct direction. (For details, see Section
4.4.)
4.4 Test operation
Before starting up the blower for test operation, make sure to perform the following inspection
to confirm that the condition is normal.
•
Confirm that materials, bolts, nuts, tools, etc., used in construction works are not left inside
the duct or casing, or near the intake port/discharge port.
•
Confirm that the blower installed is free from rattling and that all the bolts and nuts are
tightened without omission.
•
Confirm that the protective parts used in transport have been removed.
•
Confirm that a metallic wire net has been attached with the intake port/discharge port open.
•
Check the electric wiring.
•
Confirm that the items above are normal, turn on the switch once, and then turn it off
(inching) immediately to check for abnormal vibration or contact sound. At the same time,
visually confirm the rotation direction. (Affix a seal to the main body to indicate the rotation
direction.) If the blower rotates in the reverse direction, it makes the air flow in the reverse
direction.
•
If the rotation direction is reversed, turn off the source power supply, switch two of the three
power cables with each other while the other cable remains connected, and then confirm
the rotation direction. Since different motor rotation directions and motor installation
directions are available for the blower, the wiring method may differ from the indication on
the motor terminal box. Also, since the colors of cables and phase of the power supply may
differ depending on the power company, reverse rotation may occur even if cables of the
same color are connected. When the power is initially supplied, make sure to confirm the
rotation direction.
•
If no abnormality is found during inching, rotate the blower continuously to check for
abnormal noise. In addition, measure and record vibration values and current values, and
confirm that they are in the normal ranges.
•
Before starting the formal operation, replenish the blower with the specified grease that
came with the blower. (See Section 5.2.)
•
When using an air flow adjustment damper, open it fully at first, and then gradually throttle it
to reduce the degree of opening. If a change is detected in the course of throttling the
damper, e.g., sudden noise, increase in vibration, decrease in pressure, etc., degree of
opening to the fully closed side is not allowed so as to prevent stalling. When an axial flow
type blower is used, the range of air flow adjustment by a damper is limited and a judgment
must be made taking into account the above-mentioned consideration. It is recommended
to change the rotation speed for air flow adjustment.
