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Altivar Process ATV900 wiring details, Grounding to a common terminal.

PE (double) terminal in Altivar process series, size 6 is common for incoming (supply) cable and outgoing (motor) cable
How to connect doubled incoming PE wire and doubled PE motor wire?

PE conductors do not need to have the same cross-section as the cross-section of the phase conductors.
The table on the following link shows the min cross-section of PE conductor. Please note that if the phase cross-section is over 35mm2, the PE conductor size is enough to be half of the phase cross-section.
For example, if 2x90mm2 is used for L1, L2, L3, then 1x90mm2 or 1x120mm2 is enough for PE.

For this reason, the PE terminal on Altivar process size 6 (HC11N4, HC13N4, HC16N4) can be used for both power supply and motor cable.
PE terminal as well as other power terminals (L1,L2,L3, U,V,W) allow connection of 3 cables.
In case the incoming PE wire is doubled (2x70 or 2x95 or 2x120mm2), connect both PE wires under one screw in the bottom line of the PE terminal. The upper screw will be used for 1xPE conductor for the motor cable.
If motor cable is with a doubled PE conductor, then a better solution is to add a separate PE busbar in the enclosure. Busbar to be connected with upper PE screw in ATV (1x70, 1x90 or 1x120mm2) and doubled PE conductor of motor cable to be connected to PE busbar.

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