Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC327E
Operating Instructions, 06/2019, A5E40965257-AD
25
WARNING
Risk of lightning strikes
A lightning flash may enter the mains cables and data transmission cables and jump to a
person.
Death, serious injury and burns can be caused by lightning.
Take the following precautions:
•
Disconnect the device from the power supply in good time when a thunderstorm is
approaching.
•
Do not touch mains cables and data transmission cables during a thunderstorm.
•
Keep a sufficient distance from electric cables, distributors, systems, etc.
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:
Note
The function earth cannot connect hazard live parts.
WARNING
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 function earth before you put it into operation.
•
The function earth terminal on the device must be connected to the function earth of the
control cabinet or system in which the device is installed.
•
Never operate the device without function earth.
•
If a device is defective, remove it from operation without delay and label it accordingly.