Emc Considerations; Earthing Guidelines - ABB PQFS Installation, Operation And Maintenance Instructions

(e.g. hi-pot or megger) on the inverter units. Check the insulation of the assembly by
measuring the insulation resistance of the filter between the Protective Earth (PE) and all
3 phases shorted together, with main contactor shorted, and auxiliary circuit open
(auxiliary fuses removed). Remove P2 and P3 plugs from the control board. Remove also
the output cable of the 24 V power supply.
WARNING: Making the test with the auxiliary circuit closed may damage the filter.
Use a measuring voltage of 500 Vdc. The insulation resistance must be higher than 500
kW per enclosure.
6.4

EMC considerations

The active filter complies with the following EMC guidelines:
EN/IEC 61000-6-2, Industrial level: Immunity standard for industrial environments.
EN/IEC 61000-6-4, Class A: Emission standard for industrial environments.
6.5

Earthing guidelines

Each PQFS plate has one marked earth points (PE). The earth point is situated at the
bottom right side of the filter plate
For safety reasons and for proper operation of the filter the earth point of each enclosure
must be connected to the installation's earth (PE). A copper (Cu) cable of minimum size
16 mm² is recommended but local regulations should also be taken into account.
Remark: in PEN systems, the earth connection of the filter must be connected to the
installation's earth (PE) and not to the N-conductor.
Further, the following rules should be respected:
Figure 29: Identification of the earth point on the PQFS hardware
· When the PQFS consists of only one enclosure, the enclosure's PE-point must
be connected directly to the installation's PE-point
· When the PQFS consists of more than one enclosure, each enclosure's PE-point
must be connected directly to the installation's PE-point. Additionally, all cubicles'
secondary PE-points must be interconnected. This is illustrated in
interconnection cable should be minimum 16 mm².
(Figure 29)
Manual Power Quality Filter PQFS ç Electrical design and installation 37
Earth point (PE)
Figure 30. The