Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC277E
Operating Instructions, 11/2019, A5E35783335-AE
51
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 earth 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. Death and serious bodily injury can result.
• 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
● PE conductor with a minimum cross-section of 2.5 mm
2
= AWG14
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