K&R GT600-4T132G User Manual page 329

Appendix A Standards Compliance
A.1.8 Solutions to Current Leakage
AC drive outputs high-speed pulse voltage, producing high-frequency leakage current during
running of the drive. Each AC drive produces more than 100 mA leakage current. Therefore, it
is necessary to select a residual current circuit-breaker with rated operating current of 100 mA
above.
AC drive generates DC leakage current in protective conductor. In this case, a time-delay B-type
breaker must be used. If multiple AC drives are required, each AC drive must be installed with a
circuit-breaker.
Factors that influence the leakage current are as follows:
● AC drive capacity
● Carrier frequency
● Type and length of motor cable
● EMI filter
When leakage current causes the circuit-breaker to act, you should:
● Increase sensitivity current of circuit-breaker.
● Replace circuit-breaker with a new one with high-frequency suppression function.
● Reduce carrier frequency.
● Shorten length of the output cable.
● Install a current leakage suppression device.
Recommended residual current circuit-breaker manufacturers are Chint Electric and Schneider.
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