Function and Device Design
8
161936 / 941160310020
2015-09-15·BA00·III·en·08
Zone 1 Ex e field device coupler
Series 9411/11
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Power management
Soft start:
The soft start function activates the spurs one after the other. Staggering the activation
prevents a large amount of start-up current flowing through the field devices. This means
that the fieldbus power supply used is protected from current spikes and operation of the
field device coupler is not impaired by the voltage drop.
Short-circuit switch-off:
In the event of a short circuit, the spur in question is deactivated until the short circuit is
eliminated. In the event of a short circuit in several spurs, the trunk will be loaded with no
more than one short-circuit current. This minimises the current consumption of the trunk
and the power dissipation of the field device coupler under all operating conditions.
4.2
Device Design
11187E00
#
Device component
Description
1
Connection terminals for the Ex e area
Ex e connection terminals for the trunk and the
jumper to activate the EOL resistor
2
Connection terminals for the Ex e area
Ex e connection terminals for spurs 1 ... 4 or
spurs 1 ... 8
3
LEDs
Operation indication LEDs for spurs 1 ... 4 or
spurs 1 ... 8
4
LED
"PWR" for Power operation indication LED
5
Shield bus
Shield bus for cable shields with movable terminals
6
Earth bolt
Earth bolt for earthing
7
Park position
Park position for jumper to activate the EOL resistor