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8
Installation guidelines
8.1
Power connection
1070 072 302-101 (01.06) GB
On setting up a system in which electrical equipment such as control sys-
tems are deployed, the following regulations must always be complied with:
D DIN VDE 0100
D EN 60 204-1
D EN 50 178
DANGER
Hazard to persons and property!
D Dangerous states of the system that can lead to personal injury
or damage to property must be prevented!
D The regulations for the setup of EMERGENCY STOP devices in
accordance with EN 60 204-1 must be observed!
D It must be excluded that machines start up of their own accord
after reconnection of the mains voltage, e.g. following an EMER-
GENCY STOP!
D Protection against direct and indirect contact must be ensured by
the prescribed measures (connection with protective earth,
insulation, etc.)!
The power connection must be equipped with safe isolation complying with
EN 50 178, section 5.2.18.1. Transformers with safe isolation must be
designed complying with EN 60 742.
The 24 V power supply is then regarded as extra-low voltage with safe
isolation complying with EN 50 178, section 5.2.8.1. It can be designed
either as safety extra-low voltage (SELV) without earthing of the reference
lead or as protective extra-low voltage (PELV) with earthing of the reference
lead.
A 3-phase power connection with simple full–bridge rectification is
adequate. The superimposed AC voltage proportion must not exceed 5%.
All cables of the 24 V power supply must
D be laid separate from cables with higher voltages or
D be specially insulated, whereby the insulation must be designed for the
highest occurring voltage, see EN 60 204-1: 1997, section 14.1.3.
.
All peripheral devices such as digital sensors / actuators or other bus
connections connected to the interfaces of the IO-BOX32 must also
meet the criteria of safe isolation from power circuits.
8–1
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