3-62 Installing the Drive
DC590+ Series DC Digital Drive
Earth Fault Monitoring Systems
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 (1998) / VDE0160 (1994) / EN60204-1 (1994)
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 BS EN61009-1 : 2004).
• Have adjustable trip amplitude and time characteristics to prevent nuisance tripping on switch-on.
NOTE When the ac supply is switched on, a pulse of current flows to earth to charge the EMC filter internal capacitors
which are connected between phase and earth. This has been minimised in Parker SSD Drives 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.
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