Circuit Breakers - Parker AC890 Product Manual

890SD Semiconductor Protection Fuses
Short circuit protection Semiconductor Fuses should be installed in the 3-phase supply to the drive module to
protect the input bridge. Circuit breakers or HRC fuses will not protect the input bridge.

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
Parkers' 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.
Circuit breakers used with VSDs and other similar equipment are not suitable for personnel protection.
890SD (Standalone) Drive: Frame G, H & J
Use another means to provide personal safety. Refer to EN50178 / VDE0160 / EN60204-1
WARNING
Associated Equipment
5-10
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