Allen-Bradley 1797-PS2E2 PLC Power Supply Modules
The Allen-Bradley 1797-PS2E2, also cataloged as the 1797-PS2E2 Intrinsic Safety Power Supply, operates as a dedicated hardware component for converting non-incendive field power into intrinsically safe bus power within FLEX Ex I/O backplane architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1797-PS2E2 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 11.99 lbs |
| Dimensions | Standard FLEX Ex flameproof/explosion-proof enclosure footprint |
| Operating Temp | -20 deg C to 70 deg C |
| Power Consumption | 18-32 VDC input range, 1.6 A max current draw |
| Output Protection | Intrinsically Safe (Ex i) output limits |
| Certifications | ATEX certified for explosive atmospheres |
| Connection Type | IS terminal block connection |
| Bus Support | FLEX Ex backplane power delivery |
Deterministic Network Backplane and Interface Performance
Designed to deliver galvanically isolated power to hazardous area I/O drops, the power supply module converts standard 18-32 VDC bulk input into energy-limited output rails for backplane communication buses. Integrated current-limiting Zener networks and fast-acting crowbar circuits prevent electrical fault propagation from reaching downstream I/O modules and intrinsic safety field devices. High noise rejection filters suppress switching ripple and common-mode transients, ensuring deterministic signal conversion and backplane bus stability in high-density hazardous location deployments.
Frequently Asked Questions
Q: Can the 1797-PS2E2 supply power directly to non-IS standard FLEX I/O modules?
A: No, the 1797-PS2E2 is specifically designed with intrinsically safe voltage and current limiting parameters for use exclusively with FLEX Ex (1797 series) hazardous location modules.
Q: How is galvanic isolation maintained between the power input and the IS output bus?
A: Internal multi-stage isolation transformers and optical isolators separate the 18-32 VDC field power input from the energy-limited IS output terminals, preventing earth fault loop currents.
Q: Does the module support hot-swapping inside ATEX Zone 1 / Zone 2 environments?
A: Hot-swapping must strictly adhere to site-specific hazardous area work permits; however, the internal IS circuitry allows live module insertion and removal without risking thermal ignition.
Field Installation Guidelines
Mount the unit securely to a rigid enclosure backplate or heavy-duty DIN-rail structure to accommodate its 11.99 lbs physical mass. Ensure primary input wiring (18-32 VDC) is physically segregated from intrinsically safe output field wiring by a minimum clearance of 50 mm or using grounded metallic barriers in compliance with NEC/IECEx hazardous location wiring standards. Verify that the protective earth (PE) grounding lug is bonded directly to the main cabinet ground bus with a low-impedance conductor to guarantee proper surge voltage suppression and intrinsic safety grounding.
Allen-Bradley 1797-PS2E2 PLC Power Supply Modules
Allen-Bradley 1797-PS2E2 PLC Power Supply Modules
The Allen-Bradley 1797-PS2E2, also cataloged as the 1797-PS2E2 Intrinsic Safety Power Supply, operates as a dedicated hardware component for converting non-incendive field power into intrinsically safe bus power within FLEX Ex I/O backplane architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1797-PS2E2 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 11.99 lbs |
| Dimensions | Standard FLEX Ex flameproof/explosion-proof enclosure footprint |
| Operating Temp | -20 deg C to 70 deg C |
| Power Consumption | 18-32 VDC input range, 1.6 A max current draw |
| Output Protection | Intrinsically Safe (Ex i) output limits |
| Certifications | ATEX certified for explosive atmospheres |
| Connection Type | IS terminal block connection |
| Bus Support | FLEX Ex backplane power delivery |
Deterministic Network Backplane and Interface Performance
Designed to deliver galvanically isolated power to hazardous area I/O drops, the power supply module converts standard 18-32 VDC bulk input into energy-limited output rails for backplane communication buses. Integrated current-limiting Zener networks and fast-acting crowbar circuits prevent electrical fault propagation from reaching downstream I/O modules and intrinsic safety field devices. High noise rejection filters suppress switching ripple and common-mode transients, ensuring deterministic signal conversion and backplane bus stability in high-density hazardous location deployments.
Frequently Asked Questions
Q: Can the 1797-PS2E2 supply power directly to non-IS standard FLEX I/O modules?
A: No, the 1797-PS2E2 is specifically designed with intrinsically safe voltage and current limiting parameters for use exclusively with FLEX Ex (1797 series) hazardous location modules.
Q: How is galvanic isolation maintained between the power input and the IS output bus?
A: Internal multi-stage isolation transformers and optical isolators separate the 18-32 VDC field power input from the energy-limited IS output terminals, preventing earth fault loop currents.
Q: Does the module support hot-swapping inside ATEX Zone 1 / Zone 2 environments?
A: Hot-swapping must strictly adhere to site-specific hazardous area work permits; however, the internal IS circuitry allows live module insertion and removal without risking thermal ignition.
Field Installation Guidelines
Mount the unit securely to a rigid enclosure backplate or heavy-duty DIN-rail structure to accommodate its 11.99 lbs physical mass. Ensure primary input wiring (18-32 VDC) is physically segregated from intrinsically safe output field wiring by a minimum clearance of 50 mm or using grounded metallic barriers in compliance with NEC/IECEx hazardous location wiring standards. Verify that the protective earth (PE) grounding lug is bonded directly to the main cabinet ground bus with a low-impedance conductor to guarantee proper surge voltage suppression and intrinsic safety grounding.
