8-segment redundant fieldbus power
system for use with Yokogawa
CENTUM 3000 R3 Control System
The F880 fieldbus power system is designed
to provide redundant power for eight FOUNDATION
fieldbusTM H1 segments when used with Yokogawa
ALF111 fieldbus cards. The F880 module carrier has
system connectors for direct connection to two
redundant pairs of fieldbus cards using Yokogawa
AKB336 cables. Power for the fieldbus segments is
provided by two F801 power modules operating in
a redundant configuration. Failure alarms, galvanic
isolation,
power
conditioning
and
segment
termination are incorporated into each F801
module.
In simplex applications, a single F801
module may be used. Termination of the fieldbus
segments is automatically maintained when single or
redundant F801 modules are fitted.
For extreme reliability, the module carrier has
no components and only provides interconnections
between
the
power
modules
and
external
connections. It is supported in a rigid metal frame
that protects the circuit board from mechanical
damage. Secure DIN-rail mounting is provided by
integrated fixings.
Each F801 module monitors the output of the
eight fieldbus segments and indicates an alarm by
means of a built-in, normally closed relay if any of the
segments is shorted or below the minimum output
voltage threshold. Failure of either of the bulk power
input supplies is also annunciated. The alarm contacts
are volt-free and galvanically isolated from other
circuitry. Connections to the alarm relays are made via
terminals on the F880-CA carrier. A separate alarm
module is not required for this function. LED indicators
also show the status of each F801 module and the
eight individual segments. In normal operation, each
segment LED is lit, showing that the segment is
powered. If a segment is shorted, this LED is
extinguished, and the module Alarm LED is lit.
A separate physical layer diagnostics module
may be installed on the carrier to automatically collect
and distribute additional diagnostic information for
each of the eight fieldbus segments.
The
F801
module
provides
galvanic
isolation between the 24V DC input power and the
fieldbus segments, as recommended by the
IEC61158-2 fieldbus standard and the FIELDBUS
Foundation
™ FF-831 validation test for power
conditioners.There is also galvanic isolation between
the fieldbus segments, thereby preventing multiple
segment failures due to ground faults on more than
one segment. Each segment has its own fieldbus
power conditioner and current limitation.
Redundant 24V DC (nom.) input power is
connected to the F880 carrier using two-part
pluggable connectors. Field wiring connections are
available with either pluggable screw terminals (F880-
PS) or pluggable spring clamp terminals (F880-PC).
FOUNDATION fieldbus
™ is a trademark of Fieldbus Foundation™ , Austin, Texas.
♦♦ Low power dissipation
♦♦ Passive module carrier
♦♦ On-line diagnostics option
♦♦ Redundant power & conditioning
♦♦ Integrated redundant fieldbus
power for ALF111 FOUNDATION
fieldbus
™
™ cards
♦♦ High-density, compact design
♦♦ Fully isolated
F880
EUROPE (EMEA)
Tel: +44 (0)1582 723633
Fax: +44 (0)1582 422283
AMERICAS
Tel: +1 603 926 0090
Fax: +1 603 926 1899
ASIA PACIFIC
Tel: +65 487 7887
Fax: +65 487 7997
E-mail: enquiry@mtl-inst.com
Web site: www.mtl-inst.com
Dec 2005
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