Siemens PM240-2

Connecting-up
5.1 Line and motor connection
Power Module PM240-2
Hardware Installation Manual, 12/2015, A5E33294624B AD
41
5.1.2
Dimensioning the protective conductor
WARNING
Danger to life caused by high leakage currents for an interrupted protective conductor
The drive components conduct a high leakage current via the protective conductor.
Touching conductive parts when the protective conductor is interrupted can result in death
or serious injury.
• Lay the protective conductor as specified.
Laying the protective conductor
①
For the protective conductor of the line-system connection within a machine or system, the following applies:
1. Observe the local regulations for protective conductors subject to an increased leakage current 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.
②
The protective conductor must have at least the same cross-section as the line cable of the inverter.
For a cross-section of the line cable ≥ 6 mm², cross-section = 6 mm² suffices for the protective conductor.
③
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 protective con-
ductor.
④
The protective conductor must have at least the same cross-section as the motor cable of the inverter.