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6. Wiring
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When using other manufacturer’s motor (another manufacturer’s motor could conceivably be used depending upon the specifica-
tions of the motor), refer to the instruction manual for the motor concerned.
This manual shows wiring for motors with Japanese standard specifications. Please consult with us for motors with overseas specifica-
tions.
DANGER
- Do not handle the unit when cables are energized. Be sure to turn off the power when working on the unit; otherwise, electric
shock may result.
- Connect a power cable to the unit according to the diagram shown inside the terminal box or in the maintenance manual;
otherwise, electric shock or fire may result.
- Do not forcibly bend, pull, or clamp the power cable and lead wires; otherwise, electric shock or fire may result.
- Correctly ground the grounding bolt; otherwise, electric shock may result.
- In the case of explosion proof motor, drew lead wire with following the facility’s regulations, electrical codes, and explosion
proofing standard. otherwise, electric shock, injury, fire, or damage to the equipment may result.
CAUTION
- When wiring, follow the facility’s regulations and electrical codes, in order to prevent burning, electric shock, injury, and fire.
- The motor is not equipped with a protection device. However, it is compulsory to install an overload protector according to
facility electrical codes. It is recommended to install other protective devices (earth leakage breaker, etc.), in addition to an
overload protector to prevent burning, electric shock, injury, and fire.
- Do not touch the terminals when measuring insulation resistance; otherwise, electric shock may result.
- When using a star-delta
starter, select one with an electromagnetic switch on the primary side (3-contact point type); other-
wise, fire may result.
- Voltage PWM inverters that use I GBT generate high-voltage surges at the motor terminals, which may degrade the insulation
on the motor windings. Especially when hen using long 400v cable, a surge voltage over 1300V occurs. Therefore, in this case,
install an LCR filter, AC reactor, etc. between the inverter and motor to inhibit the surge voltage.
- For motor with brake, do not energize the brake coil when the motor is stopped. Otherwise coil burnout fire may result. Also,
mistaken wiring could damage the rectifier.
- When measuring the insulation resistance of explosion proof motor , confirm that there is no gas or explosive vapor in the
vicinity, in order to prevent explosion or ignition.
- If ambient temperature exceeds 60°C, place the rectifier in a location where the temperature is 60°C or less. In this case, al-
ways protect the entire rectifier with a cover. However, standard ambient temperature conditions for units with and without
brakes is -10 to +40°C. (Manufacturing with a special specification is required for operation in an environment where ambient
temperature exceeds 40°C.)
- Long cables cause large voltage drops. Select cables with appropriate diameter so that the voltage drop will no be grater
than 2%.
- After wiring outdoor types and explosion proof types, check that terminal box mounting bolts are not loose, and correctly
attach the terminal box cover.
