KROHNE BW 25 Ex II 1-2 G EN - Manual (Page 14)

4
ELECTRICAL CONNECTIONS
14
BW25
www.krohne.com 03/2010 - 4000862901 MA BW25-Ex-II1/2G-AD R01 en
4.3 Electrical connection BW25/.././M10
Terminal compartment Terminal compartment Terminal compartment Terminal compartment
The cover for the electronics compartment is secured by means of a special clasp. Use an SW3
Allen key to turn the screw.
The electrical connections for the power supply and I/O functions are made in the integrated
terminal compartment of the converter. The protection type of the terminal compartment is Ex d.
Unused openings shall be closed in compliance with DIN EN 60079-1.
Cable entries and blanking plugs used shall comply with class of protection when they are ready
for operation and receive individual separate certification in accordance with DIN EN 60079-1. In
accordance with the standard IP54 is requested as minimum.
The cables can be routed into the flameproof terminal compartment in different ways:
• Direct entry of the power cables by way of flameproof cable glands in the flameproof terminal
compartment requires a separate test certificate as per DIN EN 60079-1 for flameproof
entries.
• Direct entry of the cables by way of conduits into the flameproof terminal compartment of the
device requires a flameproof joint after screwing in the conduit and a suitable stopping box in
accordance with DIN EN 60079-1.
• Direct entry of the cables by way of conduits using built-in conical thread adapters. Only
conduit with threaded ends that comply with the description on the adapter shall be inserted
into the thread adapter. The thread on the conduit must conform to the requirements of
standard DIN EN 60079-1 (min. 6 threads). A suitable stopping box shall be provided within
450 mm of the entry into the terminal compartment.
Connecting cable Connecting cable Connecting cable Connecting cable
Connecting cables shall comply with relevant installation standards (e.g., EN 60079-14 / VDE
0165). The outer diameter of the connecting wires shall conform to the cable clamping area for
the supplied cable entries.
CAUTION!
Ensure that the thread adapter is firmly seated in the housing. This applies in particular after
loosening the conduits. Devices shall be electrically isolated before loosening the conduits.
Before loosening any conduit adapters, be sure to allow for any necessary waiting times before
opening the flameproof enclosure.
The continuous service temperature range of any components used shall be at least -40…+70°C
(-40...+158°F). For temperature ranges where a heat-resistant cable is specified, the continuous
service temperature range must be at least -40…90°C (-40...+194°F).
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