3-3
3.6 Precautions
for
wiring
work
Warning
•
Use high-quality wiring equipment and devices, and carry out wiring
work safely and securely according to the technical standards for
electrical facilities, as well as the indoor wiring regulations.
•
Only qualified personnel such as licensed electrical engineers are
allowed to carry out electrical wiring work. Incomplete wiring work by
unqualified persons is prohibited by law.
•
Do not forcibly bend, pull, or pinch the power cable. Otherwise, it may
lead to an electric shock.
(1) Be sure to install a ground fault interrupter on the primary power side of the fan.
(2) To prevent burnout of the motor and to protect the circuit, be sure to install an electromagnetic
switch fitted with a thermal relay on the wiring of the motor. Use a thermal relay of manual reset
type instead of automatic reset type.
On selecting the thermal relay, refer to the catalog, as a guide, for the electric current value at the
maximum flow rate.
(3) Be sure to connect a ground wire to prevent an electric shock.
Do not connect the ground wire of the fan to the ground wire of a gas pipe, water pipe, lightening
rod, or telephone line.
Warning
Incomplete grounding work is prohibited by law and is extremely
dangerous.
(4) Connect the power wires according to the wiring diagram in the next section “3.7 Wiring method.”
(5) Control the fluctuation of the voltage within ±10% of the rated voltage, and the frequency within
±5% of the rated frequency. Keep in mind that if you use the fan at a voltage or frequency out of
the range, the fan may break down.
(6) Before running the fan, check the following points again:
c
An appropriate fuse (breaker) is installed.
d
Wiring is correct.
Warning
Improper wiring may lead to an electric leak and a fire.
e
The fan is securely grounded.
f
Depending on the product model, your fan needs either single-phase 100V power or
three-phase 200V power. Connect your fan to the correct power source.
g
For a three-phase powered model, ensure that none of the three wires of the motor is loose or
disconnected.
Caution
Do not run a three-phase powered model with only two power wires
connected. Otherwise, it may cause the motor to burn out.
