Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC427E
Operating Instructions, 09/2017, A5E37454814-AB
37
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
conductor of the control cabinet or system in which the device is installed.
• Never operate the device without protective conductor.
• Take a faulty device out of service immediately and mark it accordingly.
● The device has been installed.
● 1 protective conductor, minimum cross section 2.5 mm
2
● 1 T20 screwdriver
● 1 x M4 cable lug
Crimp the cable lug onto the protective conductor.
Screw the cable lug onto the protective
conductor connection as shown.
Wire the protective conductor to the protective conductor connection of
the control cabi-
net in which the device is installed.
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