FOXBORO FPS400‑24

Technical Specifications: Rated power: 400 W Input voltage: 120/240 V AC or 125 V DC Nominal output: 24 V DC, adjustable range 22.8 V‑26.4 V DC Isolation voltage: Input‑output 3000 V AC, input‑chassis ground 1500 V AC, output‑chassis ground 500 V AC Current‑limiting mode: Dual‑stage current limiting Overvoltage shutdown threshold: 28.0 V DC Internal fuse: 10 A slow‑blow fuse Operating temperature: ‑40 °C ~ +70 °C Protection class: IP20 Mounting method: DIN‑rail mounting or wall mounting Certifications: UL, UL‑C, CENELEC, suitable for Class1 Division2, Zone2 hazardous location application Cooling mode: Fan‑free convection cooling Weight: 0.7 kg

Functional Features: Transformer‑isolated 24 V DC output improves power‑supply anti‑interference capability Dual‑stage current limiting, overvoltage shutdown and internal fuse multi‑layer protection Fan‑free convection cooling eliminates fan failure risk Gasket sealed housing resists dust, moisture and corrosive atmosphere LED visual status and alarm indicator Support hot‑swap replacement in redundant power configuration Wide input voltage range adapts to complex industrial power‑grid condition Power‑factor correction circuit improves power‑grid adaptability

Application Scenarios: Foxboro I/A Series DCS control cabinet power supply for 200‑series FBM modules Petrochemical, chemical industry process control DCS system Power‑plant auxiliary control system Oil‑gas field Division2 / Zone2 hazardous area control cabinet Water‑treatment plant large‑scale distributed control system Paper‑making, metallurgy industry automation control cabinet

Material Composition: Module housing: Gasket‑sealed flame‑retardant engineering plastic Internal circuit substrate: FR‑4 high‑temperature‑resistant flame‑retardant circuit board Internal isolation transformer: Insulated copper winding with silicon‑steel core Connection terminals: Tin‑plated copper alloy Mounting bracket: Zinc‑plated metal sheet

Structural Characteristics: Compact modular unit structure, complete independent power unit Rotatable DIN‑rail mounting bracket supporting horizontal or vertical DIN‑rail installation, bracket can be removed for wall mounting Front‑panel LED status indication window Sealed gasket structure for housing seam without ventilation fan hole Rear‑side wiring terminal area, signal and power terminals separated layout No rotating moving components inside module

Working Principle: Input AC or DC power goes through input filter and rectification circuit. High‑frequency isolated switching conversion generates stabilized 24 V DC output. Real‑time sampling circuit monitors output voltage and current. When over‑current reaches 110 % rated value, dual‑stage current limiting activates. When output voltage exceeds 28.0 V DC, over‑voltage shutdown circuit cuts output. Internal fuse provides final‑stage short‑circuit protection. Isolation transformer isolates input‑output circuit to restrain power‑grid interference from transmitting to DCS I/O modules. Redundant parallel connection supports system non‑stop maintenance.

Installation Requirements: Mount on standard TS35 DIN‑rail or fix on cabinet wall after detaching bracket. Keep sufficient surrounding space for convection cooling, do not enclose module inside sealed small compartment. Install inside control cabinet, avoid direct corrosive gas and water splash. Implement protective ground connection for module chassis. Do not power DCS baseplate field‑bus modules and external field devices from same single FPS400‑24 unit. Follow hazardous‑area installation specification when deployed in Division2 / Zone2 site. Wiring must comply with local industrial electrical standard.

Usage Notes: Do not exceed 400 W maximum total output power load. Do not operate beyond ‑40 °C ~ +70 °C ambient temperature range. In redundant configuration, confirm module hot‑swap function before live replacement. Avoid dust accumulation on housing gasket surface. Do not modify internal circuit or remove housing seal gasket. When protection alarm triggers, cut off input power, eliminate overload or short‑circuit fault before restoring power supply. Regularly inspect terminal tightening condition.