KROHNE ESK4 Ex II2G Ex iEN - Manual (Page 8)

4
ELECTRICAL CONNECTIONS
8
ESK4... ...
www.krohne.com 05/2014 - 4001078702 MA ESK4 Ex II2G AD R02-en
Electrical connections
4.1 General notes
The electrical connection of the intrinsically safe signal circuit with protection level "ia" to the
modules ESK4... , ESK4 FF and ESK4 PA is independent of polarity. The connection of the ESK4
I/O module is polarity sensitive. The connection to all modules is made by colour-coded
pluggable connection terminals. The colour coding of the terminals must be observed. The
permissible maximum values of the separate circuits (electrical data) must be observed.
The connecting cables must be selected according to prevailing installation standards (e.g.
EN 60079-14).. The connecting cables must be fixed and laid so they are sufficiently protected
against damage.
All cores that are not used must be securely connected to the ground potential of the hazardous
area or carefully insulated against each other and against ground (test voltage ≥ 500 V
eff
).
4.2 Power supply
Electronic signal outputs do not require a separate power supply. The required supply is
provided via the 4...20 mA current output or bus-connection.
AD_ESK4_II2G_R02_en_4001078702_PRT.book Page 8 Wednesday, June 25, 2014 7:19 AM