Siemens PC 677B 用户手册

 

Connecting 

 

4.4 Connecting the Equipotential Bonding Circuit 

SIMATIC Panel PC 677B 
Operating Instructions (Compact), 06/2008, A5E02217246-01 

23

 

4.4 

Connecting the Equipotential Bonding Circuit 

A low-resistance ground connection ensures that interference signals generated by external 

power supply cables, signal cables or cables to the I/O modules are safely discharged to 

ground.  
The equipotential bonding connection of the device is located underneath the device and is 

identified by the following symbol: 

 

Figure 4-1 

Equipotential Bonding 

Connecting the Equipotential Bonding Circuit 

You require a TORX T20 screwdriver to connect the equipotential bonding conductor. 

 

Steps for connecting the equipotential bonding 
(1)  Connect the equipotential bonding connection (M4 thread) (1) 

on the device (large surface, large-area contact) with the 

central grounding point of the control cabinet. 

The minimum permissible cross-section is 5 mm

2

.