Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC277G
Operating Instructions, 08/2021, A5E50059956-AA
33
3.3.2 Connecting the protective earth
A connected protective conductor discharges dangerous electrical charges from the metal
enclosure. The current flowing through the protective conductor when such a fault occurs
triggers an upstream protective device that disconnects the machine from the power supply.
The protective conductor also improves the discharge of interference generated by external
power cables, signal cables or cables for I/O modules to ground.
The connection for the protective conductor is labeled with the following symbol:
Electric shock and risk of fire
High voltage may be present in a defective device, which can cause fire or an electric shock
if touched. This can result in death and serious injury.
• Connect the device to the protective conductor before you put it into operation.
• The PE terminal 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.
• If a device is defective, remove it from operation without delay and label it accordingly.
Requirement
• T20 screwdriver
• Cable lug for M4
• protective conductor with minimum cross-section of 2.5 mm
2
= AWG14
Procedure
Clamp the cable lug on the protective conductor.
Firmly attach the cable lug to the protective conductor
connection on the device using the M4 thread (see part
Connect the protective conductor to the protective
conductor connection of the cabinet or the plant in
which the device is installed.
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