Power Supply; Connecting The Protective Conductor - Siemens SIMATIC IPC427E Operating Instructions Manual

Installing and connecting the device
3.3 Connecting the device
NOTICE
Damage through regenerative feedback
Regenerative feedback of voltage to ground by a connected or installed component can
damage the device.
Connected or built-in I/Os, for example, a USB drive, are not permitted to supply any voltage
to the device. Regenerative feedback is generally not permitted.
3.3.2

Power supply

3.3.2.1

Connecting the protective conductor

The protective conductor connection is needed to protect the device. The protective
conductor discharges dangerous currents, triggering a surge protection switch. The
protective conductor also improves the discharge of interference generated by external
power cables, signal cables or cables for I/O devices to ground.
Electrical shock hazard and risk of fire
Internal components of a faulty device may carry dangerous voltages that pose the risk of
fire or electrical shock. Risk of death and serious injury.
• Always connect the ground conductor before you commission the device.
• The protective conductor connection on the device must be connected to the protective
• Never operate the device without protective conductor.
• Take a faulty device out of service immediately and mark it accordingly.
Requirement
• The device has been installed.
• 1 protective conductor, minimum cross section 2.5 mm
• 1 T20 screwdriver
• 1 x M4 cable lug
32
WARNING
conductor of the control cabinet or system in which the device is installed.
= AWG14
2
Operating Instructions, 02/2021, A5E37454814-AE
SIMATIC IPC427E