Power repeater / power supply according to IEC 61158-2
FOUNDATION FieldbusPower supply, connections and operating
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
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For Ex applications with capacitive grounding, the capacitor must fulfil the following
requirements:
1. The capacitor must have a fixed dielectric.
2. The capacitance C of the capacitor must be less than or equal to 10 nF.
3. The capacitor must be designed for a design isolation voltage greater than or equal
to 1500 V.
For Ex applications a potential equalization is always required within the Ex area ac-
cording to EN 60079-14 Section 6.3 .
..
Fuchs recommends that you always use shielded leads for the
field bus.
For hard grounding with intrinsically safe applications, a potential equal-
ization must be laid between the Ex and non-Ex area.
This is not required with a capacitive ground. In the case of capacitive
grounding, note the conditions listed below for the capacitor to be used.
In the case of capacitive grounding, potential equalization is only
required in a non-Ex area if it is to be expected that different ground
potentials will occur in the application. In this case, an equalization cur-
rent through the shield must be avoided.
For additional information on grounding problems associated with the
PROFIBUS PA, please refer to the "PROFIBUS Commissioning Man-
ual“ (Part No. 2.091, available from the PROFIBUS user organisation)
For additional information on grounding problems associated with the
FOUNDATION Fieldbus, please refer to the "31.25 kbit/s Intrinsically
Safe Systems Application Guide for FOUNDATION Fieldbus“ of the
Fieldbus Foundation.
