MTL has designed and developed the F802 power supply module for use with the successful MTL F800 power supply system. The F800 Series is designed to provide redundant fieldbus power conditioners supporting eight H1 fieldbus segments.
The F802 provides, with the F800 Series, redundant power at simplex prices, a high voltage output (28 V), a high current output of 500 mA, it is ideal for long trunk lengths with high energy trunk architecture and of course it is an ideal supply for use with fieldbus barriers.
The F802 power pack powers eight fieldbus segments at 28-30 V, with a design current up to 500 mA per segment.
This makes the F802 ideal for applications requiring very long fieldbus segments. For example in a typical application with a segment consisting of 12 x 20 mA fieldbus devices, a 12-way megablock, with one spur in short-circuit and allowing 10 mA current draw for connecting an FBT-6 the maximum trunk cable length with an F802 power supply is 1130 m compared to 625 m with an F801 power supply. This is based on using a typical 44 Ω/loop km Type 'A' fieldbus cable and maintaining 13,1 V at fieldbus device as recommended in Fieldbus Foundation AG181 Engineering guidelines.
The F802 is also ideal for applications using a fieldbus barrier as a minimum trunk voltage of 16 V. In a typical application with a segment consisting of 12 x 20 mA fieldbus devices, 3 x 9311-FB fieldbus barriers, with one spur in short-circuit and allowing 10 mA current draw for connecting and FBT-6 the maximum trunk cable length with an F801 power supply. This is based on using a typical 44 Ω/loop km Type 'A' fieldbus cable and maintaining 16 V on the trunk at the fieldbus barrier.
For more information contact K.V. Dahya, Extech Safety Systems, +27 (0)11 791 6000, [email protected]
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