■ Caution in Selecting Peripheral Equipment
Wiring and connection
1. Be sure to connect the power supply to RST (input terminals)
and the motor to U, V, W (output
terminals).
2. Be sure to connect the grounding terminal. ( mark)
Inverters generate high frequency, increasing leakage current. Be sure to ground the inverter and
motor.
When using an electromagnetic contactor between the inverter and motor, do not
turn the contactor ON
or OFF during inverter operation.
Install an earth leakage breaker on the input side for protection of the inverter wiring and operators.
Conventional earth leakage breakers may malfunction because of high harmonics from the inverter;
therefore use an earth leakage breaker that is applicable to the inverter. The leakage current differs
according to the cable length. Refer to p.23.
The wiring distance between the inverter and operation panel should be less than 30m. If it exceeds
30m, use a current/voltage converter, etc. Use shielded cable for wiring.
When the wiring distance between the motor and inverter is long, the leakage current from high
harmonics may cause the protective function of the inverter and peripheral equipment to be activated.
The situation will be improved by an AC reactor installed on the output side of the inverter.
Select appropriate cable to prevent voltage drop. (Large voltage drop lowers the torque.)
Do not use a phase-advanced capacitor.
When a power factor improving capacitor is connected between the inverter and motor, the capacitor may
be heated or broken by the higher harmonics in the inverter output.
Install a thermal relay that matches the motor in the following cases:
*Install a thermal relay for each motor when operating more than one motor with one inverter.
*Set the current of the thermal relay at the rated motor current x 1.1. When the wiring length is long
(more than 10 m), the thermal relay may be activated too quickly. Install an AC reactor or current
sensor on the output side.
*When motors are to be operated with the rated current exceeding the adjustable level of the built-in
electronic thermal relay.
Wiring
between
inverter and
motor
Earth leakage breaker
Wiring distance
Phase-advanced capacitor
Electromagnetic
contactor
Thermal relay
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