2 Mounting and installation
BU 0200 en-US-4920
77
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2.6.1 Operation in potentially explosive environments - ATEX zone 22 3D
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All of the conditions which must be observed for operation of the device in an explosion hazard
environment (ATEX) are summarized below.
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2.6.1.1
Modification of the device for compliance with category 3D
Only a specially modified device is permissible for operation in ATEX zone 22. This adaptation is only
made at the NORD factory. In order to use the device in ATEX zone 22, the diagnostic caps are
replaced with anodized oil inspection glasses, among other things.
( 1 ) Year of manufacture
( 2 ) Labelling of the device (ATEX)
IP55:
II 3D Ex tc IIIB T125°C Dc X
IP66:
II 3D Ex tc IIIC T125°C Dc X
Allocation:
• Protection with "housing"
• Procedure "A" zone "22" category 3D
• IP55/IP66 rating (according to the device)
IP66 is required for conductive dust
• Maximum surface temperature 125°C
• Ambient temperature -20°C to +40°C
Information
Possible damage caused by mechanical overload
Devices in series SK 2xxE and the permitted options are only designed for a degree of mechanical
stress that corresponds to a low impact energy of 4J.
Higher loads will lead to damage to or in the device.
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The components needed for the modification are contained in an appropriately modified variable
frequency drive connection unit (SK TI4-…-EX).
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