Description
GE Fanuc 8920-PS-DC | PAC8000 IS Power Supply Module
Architect’s Product Breakdown
The GE Fanuc 8920-PS-DC operates as a critical power conversion and distribution module engineered specifically for the PAC8000 and SafetyNet intrinsically safe (IS) I/O architectures. Deployed in hazardous process environments—such as oil refineries, chemical plants, and offshore platforms—it converts standard industrial DC input power into regulated, galvanically isolated, intrinsically safe power capable of driving up to eight individual IS I/O modules mounted on a dedicated carrier.
Designed to snap onto the specialized Type 8724-CA-PS (or compatible) power supply carrier backplane, the unit supports active load sharing for redundant configurations, ensuring continuous, high-availability power delivery to safety-critical loops. Its robust internal isolation protects non-hazardous control networks from dangerous fault voltages originating in explosive field zones.
Deploying an authentic 8920-PS-DC power module guarantees system safety certification compliance, stable voltage regulation, and drop-in physical compatibility across legacy and active PAC8000 hazardous-area installations.
8920-PS-DC
Key Technical Specifications
| Parameter | Technical Specification |
| Module Type | Intrinsically Safe (IS) Module DC Power Supply |
| System Compatibility | GE Fanuc PAC8000 / SafetyNet Modular I/O Platform |
| Input Voltage Range | 18.5 to 36 VDC nominal DC input |
| Output Voltage / Capacity | 12 VDC output with 5A capacity (supports up to 8 IS modules) |
| Redundancy | Supports active load sharing for dual-redundant power setups |
| Carrier Mounting | Designed for dedicated IS power supply carriers (e.g., Type 8724-CA-PS) |
| Operating Temperature | -20°C to +60°C (-4°F to +140°F) standard industrial range |
| Physical Weight | ~1.29 kg (2.84 lbs) |
Field Engineer’s Pitfall Guide
- WARNING: Incorrect Input Voltage Polarity. Reversing the incoming 18.5–36 VDC primary power supply lines can damage internal conversion stages or trip upstream fusing elements. Verify DC rail polarity before energizing.
- WARNING: Exceeding Module Capacity Limits. Each 8920-PS-DC unit is engineered to support a maximum of 8 associated IS modules on its designated carrier segment. Overloading the rail distribution layout will cause voltage sags and module dropouts.
- WARNING: Live Backplane Misalignment. Never force the power supply module onto an unaligned carrier pin array. Doing so can bend backplane connectors and compromise the galvanic separation required for intrinsic safety certifications.
QA & Testing SOP (Transparency)
- Visual & Origin Verification: Inspection of OEM identification plates, part number tags (8920-PS-DC), safety certification markings, and multi-pin connector cleanliness.
- Bench Power & Regulation Check: Modules are mounted on an isolated test carrier, powered via a regulated DC source, and verified for clean start-up behavior and accurate 12 VDC output regulation across load sweeps.
- Redundancy & Load Sharing Validation: Technicians simulate dual-supply parallel operation to test current balancing and load-sharing handshakes between redundant power modules.
- Final Packaging: Non-volatile states are cleared, and the unit is sealed inside an anti-static moisture-barrier bag before being packed within high-density industrial foam transit containers.
Technical FAQ
Can I hot-swap this power supply module while the hazardous area loop is live?
Yes, under specific safety protocols. The PAC8000 IS architecture supports hot-swapping power modules in hazardous locations, provided that redundant power is active or local plant safety permits live maintenance on the unisolated side.
How many IS I/O modules can a single 8920-PS-DC support?
A single 8920-PS-DC power supply module is rated to drive up to 8 intrinsically safe modules mounted on its corresponding system carrier. Larger nodes require additional power supplies configured in parallel or on separate segments.
Are configuration parameters or software settings required for this module?
No. The 8920-PS-DC is a hardware-regulated power conversion module with no software-programmable settings or firmware registers to configure.
What causes the output voltage to collapse on the power rail?
An output collapse is typically caused by an overloaded carrier bus (exceeding the 8-module limit), an internal short-circuit in a field-side IS device, or an unstable primary DC input supply dropping below the 18.5 VDC threshold.
