BECKHOFF CX50x0 - Manual (Page 9)

Notes about operation in potentially explosive areas
CX50x0 units in potentially explosive areas 5
2 Notes about operation in potentially explosive
areas
2.1 Special conditions
WARNING
Observe the special conditions for the intended use of Beckhoff fieldbus
components in potentially explosive areas (directive 94/9/EU)!
 The certified components are to be installed in a suitable housing that
guarantees a protection class of at least IP54 in accordance with EN 60529!
The environmental conditions during use are thereby to be taken into account!
 If the temperatures during rated operation are higher than 70 °C at the feed-in
points of cables, lines or pipes, or higher than 80°C at the wire branching
points, then cables must be selected whose temperature data correspond to
the actual measured temperature values!
 Observe
the permissible ambient temperature range of 0 - 55°C for the use of
Beckhoff fieldbus components in potentially explosive areas!
 Measures must be taken to protect against the rated operating voltage being
exceeded by more than 40% due to short-term interference voltages!
 The individual terminals may only be unplugged or removed from the Bus
Terminal system if the supply voltage has been switched off or if a non-
explosive atmosphere is ensured!
 The connections of the certified components may only be connected or
disconnected if the supply voltage has been switched off or if a non-explosive
atmosphere is ensured!
 The fuses of the KL92xx power feed terminals may only be exchanged if the
supply voltage has been switched off or if a non-explosive atmosphere is
ensured!
 Address selectors and ID switches may only be adjusted if the supply voltage
has been switched off or if a non-explosive atmosphere is ensured!
 The optional audio interface CX50x0-N020 may not be used in EX
environment!
 The certified components must be used the modification CX1900-0105. The
modification involves the relocation of the type plate and a mounting bracket to
ensure the fixing of the cables from the USB ports. Both modifications are
factory-provided.
The fundamental health and safety requirements are fulfilled by compliance with the following standards:
 EN 60079-0:2012 + A11:2013
 EN 60079-15:2010