Contents

If Peripheral Devices are Influenced by the Starting or Running Inverter
The following solutions are possible:
• Change the Inverter's Carrier Frequency Selection (C6-02) to lower the carrier frequency. This will help to
reduce the amount of transistor switching noise.
• Install an Input Noise Filter at the Inverter's input power terminals.
• Install an Output Noise Filter at the Inverter's motor terminals.
• Use shielded motor cables or a conduit. Metal shields electrical noise.
• Check the grounding of the Inverter and motor.
• Separate main circuit wiring from control circuit wiring.
If the Earth Leakage Breaker Operates When the Inverter is Running
The Inverter’s output is pulse modulated, i.e. the output voltage consists of high frequency pulses (PWM).
This high frequency signal causes a certain amount of leakage current which may cause the earth leakage
breaker to operate and cut off the power supply. Change to a ground fault interrupter with a high leakage
detection level (i.e., a sensitivity current of 200 mA or higher, with an operating time of 0.1 s or more), or one
that incorporates high frequencies countermeasures (i.e., one designed for use with Inverters). It will also help
to some extent to lower the Inverter's Carrier Frequency Selection (C6-02). In addition, remember that the
leakage current increases as the cable is lengthened.
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