Connecting
6.3 Equipotential bonding
SIMATIC Rack PC 847B
34
Operating Instructions, 06/2008, A5E02203168-01
Secure the power plug
You can secure the power plug in order to avoid unintentional disconnection of the power
cord.
Steps for securing the power plug
1 Remove the lower left mounting screw (2) on
the power supply module.
2 Screw the power plug interlock (1) onto the
power supply module
WARNING
If the power plug is secured with a clamp, the power outlet must be freely accessible to
allow the device to be easily removed from the mains.
6.3
Equipotential bonding
A low-impedance ground connection improves the discharge of interference generated by
external power cables, signal cables or cables for I/O modules to ground.
Equipotential bonding terminal
The equipotential bonding terminal (1) on the device
(large surface, large-area contact) must be
interconnected with the central grounding busbar of
the cabinet or plant in which the PC is to be installed.
The minimum conductor cross-section may not be
less than 5 mm
2
.