Description
Product Overview
The 1797-PS2N2 is an intrinsically safe quad-channel DC power supply for the Rockwell Automation FLEX Ex I/O system. It provides isolated, energy-limited power to FLEX Ex I/O modules mounted in hazardous locations. This unit is housed in an explosion-proof enclosure and is designed to separate safe-side control power from field-side intrinsically safe circuits. The product reached end-of-sale on December 31, 2017, and is now discontinued, requiring engineered replacement for new projectsRockwell A….
Technical Specifications
| Item | Parameter |
|---|---|
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Part Number | 1797-PS2N2 |
| Product Type | FLEX Ex Intrinsically Safe Power Supply |
| Input Voltage | 19–32 VDC, dual redundant power feed |
| Input Current | 3.1 A max |
| Output | 4 independent IS channels, 8.5 W per channel |
| IS Output Rating | UO <9.5 V, IO <1 A; Co (IIC) <500 nF, Lo (IIC) <8 µH |
| Enclosure | Explosion-proof housing, 1 in NPT conduit ports |
| Hazardous Area Rating | Class I Div 1 Groups A,B,C,D; Class II Div1 E,F,G; Class III; AEx[ib] IIC T4 |
| Operating Temperature | -20 °C ~ +60 °C |
| Weight | 2.57 kg (5.67 lb) |
| Status | Discontinued (EOS: 31 Dec 2017) |
Key Features
- Quad Independent IS Outputs: Four galvanically isolated intrinsically safe channels, each individually energy-limited to prevent ignition in explosive atmospheres.
- Dual Redundant DC Input: Two separate 24 VDC input paths to maintain power continuity for critical process control.
- Explosion-Proof Construction: Certified for direct installation in Class I Division 1 hazardous zones.
- Full Energy Limiting: Built-in voltage, current and capacitance/inductance limiting for IS field wiring and FLEX Ex I/O modules.
- Local Power for Field Devices: Powers transmitters, valves and FLEX Ex I/O without additional IS barriers on the field side.
- Continuous Diagnostics: Monitors input power health and channel faults for alarm and troubleshooting.
Applications
- Oil & gas ESD and process control in Class I Div 1 hazardous areas
- Refinery and chemical plant intrinsically safe I/O systems
- Offshore platform process monitoring and control
- Pharmaceutical and petrochemical hazardous zone instrumentation
Installation & Maintenance Notes
- Mount in certified explosion-proof enclosure; follow NPT conduit sealing rules per UL/FM requirements.
- Wire IS and non-IS circuits separately to maintain intrinsic safety ratings.
- Perform IS loop calculation before commissioning to verify cable capacitance and inductance.
- Since the unit is discontinued, plan spare part inventory or system migration during scheduled outages.
- Inspect conduit seals and enclosure integrity regularly; do not modify internal wiring.
FAQ
Q: What is the difference between 1797-PS2N2 and 1797-PS2E2? A: 1797-PS2N2 is North American market version; 1797-PS2E2 is for European / ATEX installations, same electrical performance.
Q: Can this power supply be used for SIL safety loops? A: It supplies intrinsically safe power to FLEX Ex I/O; SIL rating depends on the full system architecture and proof test implementation.
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