Product Short Description
Product Name: MTL8000 Intrinsic Safety Rack Power Supply Module
Product Introduction: The 8920-PS-DC is a DC-DC power unit for MTL 8000 IS I/O racks, converting wide-range 24 VDC site power into regulated 12 VDC for intrinsically safe field I/O modules, with load-sharing for redundant configuration.
Technical Specifications:
- Input: 18.5–36 VDC
Description
- Output: 12 VDC, 5 A max
- Efficiency: ~76–78 % at typical load
- Share: parallel load balancing for N+1 redundancy
- Protection: short-circuit, over-voltage, thermal
- Indicators: front status LEDs
- Temp: -40 to +70 °C, 95 % RH non-condensing
- Enclosure: IP20 rack slot, 84 × 110 × 160 mm, 1.29 kg
Functional Features: Hot-insertion into powered rack, current sharing without external OR-ing diodes, CE marked, fault relay contact option.
Working Principle: Regulated buck conversion with current-mode control; module senses bus load and adjusts output current so multiple units split load equally and ride through single-unit failure.
Application Scenarios: MTL8000 IS racks in offshore platforms, refinery DCS remote I/O, chemical plant Zone 1 field termination cabinets.
Structural Characteristics: Metal-frame rack module, screw terminals for DC in/out, keyed guide rails, LED stack on front face.
Installation Requirements: Seat in dedicated PS slot of MTL8000 carrier; 2.5 mm² stranded conductors with ferrules; leave convection space above/below; bond negative to rack ground.
Usage Notes: Do not mix with AC-powered PS variants; parallel only identical 8920-PS-DC units; check share-bus jumper; replace fanless unit if LED shows steady fault.
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