Protective Conductor And Potential Equalization, Functional Ground - Siemens SIMATIC S7-1500 System Manual

8.9 Protective conductor and potential equalization, functional
ground
Requirement
You have installed the SIMATIC Drive Controller in the control cabinet.
Please note the following safety instructions:
Danger to life from live parts
Touching live parts can result in death or serious injury.
Always disconnect the plant and device from the power supply before commencing work.
Note
Compliance with machine and system functional safety, reliability and EMC requirements is
only guaranteed with original SIEMENS cables.
Protective conductor connection
The SIMATIC Drive Controller and the SINAMICS S120 drive system are designed for use in
control cabinets with protective conductor connections.
A connection for the protective conductor is available on the SIMATIC Drive Controller :
• Screw M5, Torx T25
• Tightening torque: 3 Nm (26.6 lbf in)
This connection is also used for the equipotential bonding conductor.
All plant and machine components are to be included in the protection concept. The drive
line-up is to be installed on a common bare metal mounting plate ⑧ to ensure compliance
with EMC limits. The connection provides a low-impedance connection to the mounting
plate.
The mounting plate must be connected to the protective conductor connection of the control
cabinet. This is done by establishing a connection ⑩ to the protective conductor bar ⑪.
Connect the protective conductor bar ⑪ to the protective conductor ⑯.
The protective connection (PE connection) of the motors used must be over the motor cable
⑫.
For EMC reasons, the shield of the motor cable should be connected over a large surface area
both at the Motor Module and at the motor.
Components that are not connected over a low-impedance connection, for example, control
cabinet door ⑭ connected with hinges, also require a protective connection ⑬.
SIMATIC Drive Controller
System Manual, 11/2023, A5E46600094-AD

8.9 Protective conductor and potential equalization, functional ground

DANGER
Connecting
131