5-8 Associated Equipment
AC30 series Variable Speed Inverter
Circuit Breakers
We do not recommend the use of circuit breakers (e.g. RCD, ELCB, GFCI), but where their use is mandatory, they should:
Operate correctly with dc and ac protective earth currents (i.e. type B RCDs as in Amendment 2 of IEC755).
Have adjustable trip amplitude and time characteristics to prevent nuisance tripping on switch-on.
When the ac supply is switched on, a pulse of current flows to earth to charge the internal/external ac supply EMC filter’s internal
capacitors which are connected between phase and earth. This has been minimised in Parker inverter filters, but may still trip out any
circuit breaker in the earth system. In addition, high frequency and dc components of earth leakage currents will flow under normal
operating conditions. Under certain fault conditions larger dc protective earth currents may flow. The protective function of some circuit
breakers cannot be guaranteed under such operating conditions.
WARNING
Circuit breakers used with VSDs and other similar equipment are not suitable for personnel protection.
Use another means to provide personal safety. Refer to EN50178 / VDE0160 / EN60204-1
External EMC Filters
Refer to Appendix C Compliance - Filters for complete information.
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