Connection
5.3 Equipotential bonding
SIMATIC IPC847C
28 Getting Started, 12/2010, A5E02669190-02
Connecting to the redundant power supply
Steps for connecting the device to mains (redundant power supply)
1 Connect the two connectors for cooling
devices ①
2 Switch both On/Off switches on or off
simultaneously. The LED at the power
supply ③ lights up green.
Note:
If only one control supply module is switched
on or connected, or a module is defective, a
warning signal is emitted. You cancel the
warning signal by pressing button
④.
5.3 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
connected 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
.
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