Power repeater / power supply according to IEC 61158-2
FOUNDATION FieldbusPower supply, connections and operating
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Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Fuchs offers power feed components with differing functionality or connec-
tions. The KFD2-EB2 and KFD2-EB2.B power supply modules are designed for a
maximum design isolation current of 4 A. The total current drawn from a power feed
module must not exceed 4 A.
7.1
Redundant power supply
The KFD2-EB.D2A.B and KFD2-EB-R2A.B power feed modules allow for redundant
power supply. The difference between the power feed modules described above and
these ones is that no decoupling diodes are integrated in this case that prevent
the flow of power from the power rail through the power feed module to the power
pack. Power feed module KFD2-EB.D2A.B is designed for connecting 2 independent
power packs, while power feed module KFD2-EB.R2A.B can only be used with one
power pack. The connection options with redundant power supply are shown in the
illustration below.
Figure 7.4: Possibilities of redundant power supplies
The KFD2-EB.D2A.B and KFD2-EB.R2A.B power supply modules are designed for a
maximum power supply current of 2 A. If the current consumption of the application
is greater than 2 A, segmentation must be performed.
If too great a current is drawn, a fuse integrated into the power supply
components will be tripped and will interrupt the power supply of the
entire power rail segment. A fuse being tripped is indicated through a
relay output on terminals 7 and 10 of the power feed module.
KFD2-EB.D2A.B
KFD2-EB-R2A.B
to
power pack 1
to
power pack 2
to power pack 1
to power pack 2
