Each power module provides galvanic isolation of 250V ac between

the fieldbus segment and the input power supplies. Each FPS-I supplies

350mA at 25V dc to the fieldbus segment. This output is maintained

even if only one power module is installed. This level of output power

allows for construction of very long fieldbus segments with a large

number of bus-powered transmitters. Each FPS provides both power

conditioning and input power supply redundancy to each fieldbus

segment.

LED indicators on each power module and near each of the two input

power supply connections give clear visual indication that components

are functioning properly. To minimize system downtime, an alarm circuit

provides notification if any of the power supply components fail. This

allows failed components to be replaced so that power system integrity

is maintained.

The alarm circuitry is galvanically isolated from the fieldbus segments

and input power supplies. The two power modules plug into a DIN rail

mounted backplane (Redundant Coupler or RCT) that contains one

segment terminator and provides connections to the two input power

supplies, H1 host system, fieldbus trunk cable, and alarm circuitry.

A bus configuration is used for the input power and alarm connections

so that up to eight fieldbus power systems can be easily wired together

to share input power supplies and provide a common alarm circuit.

Pictured above is a Redundant Fieldbus Power Supply with connections

to the Fieldbus H1 host shown at the top of the picture.

Segments that do not require the high availability provided by

redundant power conditioning may be operated with only a single

FPS-IPM. To prevent an unwanted alarm condition due to the second

FPS-IPM not being fitted, a blanking module should be installed in the

blank slot. These are supplied in a pack of 10 as part number FPS-BLK10.