Power Wiring
ANCA Motion
D-000129 Rev 09
61
5
Residual Current Detection (RCD) protection
5.2.4
Residual current detection protective devices (RCD) provide additional protection for detection of insulation faults
where current is no longer contained in power conductors.
It is only permissible to use selective AC/DC-sensitive residual-current circuit-breakers, Type B.
Parts of the electrical equipment and machine that can be touched must be integrated in a
protective grounding system.
If an external EMI filter is used, a delay of at least 50ms should be incorporated to ensure
spurious trips are not seen.
The leakage current is likely to exceed the trip level if all the phases are not energized
simultaneously.
Caution:
Under fault conditions it is possible for a DC current to be present in the protective earthing conductor.
This DC current can reduce the ability of a type A or AC type RCD to trip.
Warning:
The AMD5x system is designed for category C3, and is not intended to be used on a low-voltage
public network which supplies domestic premises.
Warning:
Earth leakage current in the protective earthing conductor exceeds 3.5 mA AC for the AMD5x system.
