Siemens SINAMICS PM240-2, Hardware Installation Manual

Page: 47 / 144

Connecting-up
5.1 Permissible line supplies
Power Module PM240-2
Hardware Installation Manual, 01/2017, A5E33294624B AE
47
5.1.4 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.
•
Dimension the protective conductor as stipulated in the appropriate regulations.
Dimensioning the protective conductor
Observe the local regulations for protective conductors subject to an increased leakage
current at the site of operation.
①
Protective conductor for line feeder cables
②
Protective conductor for inverter line feeder cables
③
Protective conductor between PE and the electrical cabinet
④
Protective conductor for motor feeder cables
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