Siemens SINAMICS G120, Installation Manual

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Connecting
4.1 Permissible line supplies
Power Module PM240-2
Hardware Installation Manual, 01/2020, A5E33294624B AL
51
The minimum cross-section of the protective conductor
①
…
④
depends on the cross-
section of the line or motor feeder cable:
● Line or motor feeder cable ≤ 16 mm
2
⇒ Minimum cross-section of the protective conductor = cross-section of the line or motor
feeder cable
● 16 mm² < line or motor feeder cable ≤ 35 mm
2
⇒ Minimum cross-section of the protective conductor = 16 mm
2
● Line or motor feeder cable > 35 mm
2
⇒ Minimum cross-section of the protective conductor = ½ cross-section of the line or
motor feeder cable
Additional requirements placed on the protective conductor
①
:
● For permanent connection, the protective conductor must fulfill at least one of the
following conditions:
–
The protective conductor is routed so that it is protected against damage along its
complete length.
Cables routed inside switch cabinets or enclosed machine housings are considered to
be adequately protected against mechanical damage.
– As a conductor of a multi-conductor cable, the protective conductor has a cross-
section ≥ 2.5 mm² Cu.
– For an individual conductor, the protective conductor has a cross-section ≥ 10 mm²
Cu.
– The protective conductor consists of 2 individual conductors with the same cross-
section.
● When connecting 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.
● Observe the local regulations for protective conductors subject to a high leakage current
at the installation site.
4.1.5 Using several single-phase converters in machines and plants
Overview
Evaluate the input currents of single-phase converters in your machine or plant in terms of
harmonics and unbalance.