Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC377G
32 Operating Instructions, 07/2022, A5E51366314-AB
3.3.2 Connecting the function earth
A connected function earth discharges dangerous electrical charges from the metal
enclosure. The current flowing through the function earth when such a fault occurs triggers
an upstream protective device that disconnects the machine from the power supply.
The function earth 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 function earth is labeled with the following symbol:
Do not connect function earth to hazardous live parts.
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 function earth before you put it into operation.
• The FE 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.
The external bonding facility should provide effective connection of a conductor with a cross
sectional area of at least 4 mm
2
.
Requirements
• T20 screwdriver
• Tightening torque: 1 Nm
• Cable lug for M4
• Protective conductor with minimum cross-section of 2.5 mm
2
(AWG14)
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