Siemens SIMATIC PANEL PC 877 - Manual (Page 49)

Connecting
6.4 Connecting the equipotential bonding circuit
SIMATIC Panel PC 877
Operating instructions, Release 07/2006, A5E00877780-01
6-7
6.4
6.4
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 on the right-hand side of the
computer unit and is identified by the following symbol:
Figure 6-1 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 .