Description

Allen‑Bradley 1797‑PS2N2 FLEX Ex Intrinsically‑Safe Power Supply

Technical Specifications

• Part Number: 1797‑PS2N2
• Brand: Allen‑Bradley (Rockwell Automation)
• Warranty: One Year
• System Platform: FLEX Ex intrinsically‑safe remote I/O system for hazardous area applicationsRockwell A…
• Input Voltage: 19‑32 VDC; max input current 3.1 A; dual redundant DC power input terminalsRockwell A…
• Output: 4 independent IS‑limited output channels, each 8.5 W; Uo＜9.5 V, Io＜1 A per channel; each channel independent energy‑limiting protectionRockwell A…
• Hazardous‑Area Certification: Class I Div1 Groups A‑B‑C‑D, Class II Div1 Groups E‑F‑G, AEx[ib] IIC Zone 1 intrinsically‑safe approvalRockwell A…
• Enclosure: Explosion‑proof cast‑aluminum housing; 1‑inch NPT conduit ports for field wiring entry/exit
• Isolation: Galvanic isolation between input side and each IS output channel per UL 913 / CSA 157 intrinsic‑safety standardRockwell A…
• Operating Temperature: ‑20 °C ~ +60 °C; storage ‑40 °C ~ +85 °C
• Protection: Per‑channel over‑voltage, over‑current, short‑circuit energy‑limiting; power‑OK status LED indicator
• Power Dissipation: 21 W internal dissipation
• Weight: approx 5.44 kg

Product Overview

The 1797‑PS2N2 is a quad‑channel intrinsically‑safe explosion‑proof power supply unit for Rockwell FLEX Ex remote I/O system. It supplies energy‑limited safe power to FLEX Ex I/O modules installed in Zone 1 / Class I Div 1 hazardous locations. Dual DC‑input supports redundant power feeding for high‑availability plant control systems. Each of four outputs features independent intrinsic‑safety energy‑limiting circuitry, preventing dangerous energy release into explosive‑atmosphere field circuits. It interfaces with DeviceNet FLEX Ex I/O network for petrochemical, oil‑gas and refinery hazardous‑zone distributed‑signal acquisition.

This power‑supply addresses hazardous‑area power challenges: explosion‑proof enclosure + multi‑channel IS power output in single unit, N+1 redundant DC‑input capability, drop‑in spare‑part compatibility for legacy FLEX‑Ex retrofit‑maintenance projects. PLC & automation engineers, refinery‑plant maintenance technicians and retrofit integrators benefit most. Typical applications: offshore‑platform, refinery hazardous‑area remote I/O cabinets, explosive‑gas zone field‑instrument power feeding.

Key Application Notes

‑Explosion‑proof field‑mount unit; cannot operate standalone; must pair with FLEX‑Ex I/O modules and host DeviceNet PLC controllerRockwell A… ‑OEM official production discontinued since Dec‑31‑2017; only aftermarket surplus/refurbished spare availableRockwell A… ‑Strictly follow IS installation rules; cable capacitance & inductance must stay below IIC‑rated maximum Co＜500 nF, Lo＜8 μH per channelRockwell A… ‑Not hot‑swap hardware: all DC input power must be fully de‑energized before enclosure opening or module replacement ‑Conduit‑seal installation must comply with local hazardous‑area electrical‑code requirements ‑Follow Rockwell 1797‑PS2N2 official user‑manual for IS‑parameter calculation, wiring and commissioning validation