Installing
4.5 Connecting the line supply, motor, and inverter components
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
81
Laying the protective conductor
For the protective conductor of the line-system connection within a machine or system, the follow-
ing applies:
1. Observe the local regulations for protective conductors subject to an increased leakage cur-
rent at the site of operation.
2. Lay the protective conductor as follows:
–
For permanent connection, the protective conductor must fulfill at least one of the following
conditions:
- The protective conductor is laid so that it is protected against mechanical damage over
its complete length.
1)
- In a multi-core cable, the protective conductor core has a cross-section of ≥ 2.5 mm² Cu.
- In a single conductor, the protective conductor has a cross-section of ≥ 10 mm² Cu.
- The protective conductor consists of two conductors with the same cross-section.
– For the connection of a multi-core cable using an industrial plug connector according to EN
60309, the protective conductor must have a cross-section of ≥ 2.5 mm² Cu.
1)
Cables laid within control cabinets or closed machine housings are considered to be adequately
protected against mechanical damage.
The protective conductor must have at least the same cross-section as the line cable of the in-
verter.
For a cross-section of the line cable ≥ 6 mm², cross-section = 6 mm² suffices for the protective
The protective conductor for the connection of the PE busbar to the control cabinet housing must
have at least the same cross-section as the line supply cable of the machine or system (
①).
For a cross-section of the line supply cable ≥ 6 mm², cross-section = 6 mm² suffices for the pro-
The protective conductor must have at least the same cross-section as the motor cable of the
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