Eaton MTL F892 8 Segment Redundant Fieldbus Power Supply for use with non-proprietary cabled systems

OVERVIEW

The F892 redundant fieldbus power supply is designed to provide redundant power

for eight (8) Foundation fieldbusTM H1 segments. Pluggable connectors are provided

on the F892-CA module carrier for connection to the eight segments. Fixed screw

terminals are used for the 8 Host segment connections. Power for the eight fieldbus

segments is provided by two F801 or F802 Power Modules mounted to the carrier

and operating in a redundant configuration. Failure alarms, galvanic isolation, power

conditioning and segment termination are incorporated into each Power Module. A

single F801 or F802 module may be used where redundancy is not required.

DESCRIPTION

For maximum reliability, the module carrier contains no components and only provides

interconnections between the power modules and the external connections. The

carrier circuit board is supported in a rigid metal frame that protects it from mechanical

damage. Secure DIN-rail mounting is provided by integrated retaining screws. The

Power Module provides galvanic isolation between the 24V DC input power and the

fieldbus segments, as required by the IEC61158-2 fieldbus standard and the Fieldbus

FoundationTM FF-831 validation test for fieldbus power supplies. There is also galvanic

isolation between the fieldbus segments, thereby preventing cross-talk between

segments in the event of ground faults in the field wiring. Each segment has its own

current limitation and passive fieldbus power conditioner. Termination of the fieldbus

segment is automatically maintained when single or redundant Power Modules are

fitted. The F892-CA carrier is equipped with connectors that will accept an F809F

diagnostic module. The module continuously monitors the performance of each of the

eight fieldbus segments, providing information on the network health.

Each Power Module has indicator LEDs to show both its status and that of the eight

segments under power. In normal operation, each green ‘Segment’ LED is lit, showing

that the segment is powered. If a segment is shorted, or its voltage is below the rated

output, its LED is extinguished, and the red ‘Alarm’ LED is lit. Redundant 24V DC (nom.)

input power is connected to the F892-CA carrier using two-part pluggable connectors.

Field wiring connections are available with either pluggable screw terminals (F892-PS)

or pluggable spring clamp terminals (F892-PC).

The figure below shows two sets of 8 connectors for connection to the Host. Early

versions of the F892 only included one set of connectors (unit date code 0711 and

earlier) and thus did not support redundant Host connection.

COMPONENTS AND ACCESSORIES

F801 8 Segment Power Module: 21 .5V, 350mA

F802 8 Segment Power Module: 28V, 500mA

F809F 8 Segment Fieldbus Diagnostic Module

F892-CA-P* Carrier

F892-P* F892-CA-P* and two F801 modules

F892-2-P* F892-CA-P* and two F802 modules

F892-P*-NR F892-CA-P* and one F801 module

F892-2-P*-NR F892-CA-P* and one F802 module

F800-BLK Blanking Module included with –NR systems

* =

S – Pluggable Screw Terminal Connectors

C – Pluggable Spring Clamp Connectors