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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value / Specification |
| Manufacturer | Foxboro / Invensys (Schneider Electric) |
| Part Number | RH101AA |
| Module Type | System Power Supply Unit (PSU) |
| Input Voltage | 100 to 240 V AC (Auto-ranging, 47–63 Hz) / 125 V DC |
| Output Voltage | 24 V DC regulated backplane rail |
| Output Current | 10 A nominal continuous |
| Efficiency | > 85% at full load |
| Redundancy | N+1 parallel redundant configuration supported |
| Isolation Rating | 1500 V AC input-to-output galvanic isolation |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Mounting | Standard Foxboro I/A Series mounting baseplate |
Product Introduction & Supply Chain Strategy
The Foxboro RH101AA is a heavy-duty system power supply module engineered to deliver clean, regulated DC voltage to Foxboro I/A Series control processors and fieldbus modules. It features built-in surge suppression and voltage regulation, shielding connected I/O hardware from line noise and brownout conditions across industrial plant environments.
As a primary point of failure for legacy DCS racks, keeping a New Surplus RH101AA unit on-site serves as essential operational insurance. Refurbished power supplies frequently suffer from dried electrolytic capacitors and thermal stress on power semiconductors, leading to sudden voltage drift and unexpected rack shutdowns. Sourcing factory-clean surplus eliminates these hidden failure modes while preserving system availability.
Installation & Configuration Guide
1.Pre-Installation (Prep & Safety):Disconnect primary AC power and ensure safe handling.
Isolate the main incoming power feed using lock-out/tag-out (LOTO) procedures. Equip an ESD wrist strap connected to cabinet earth ground. Inspect the replacement RH101AA module’s terminals for physical integrity and verify input voltage rating settings match plant utility levels.
2.Removal of Legacy Hardware:Extract failed module without disrupting adjacent cards.
Loosen the module locking screws on the baseplate frame. Firmly pull the module handle straight out to disconnect the heavy-duty rear power connectors from the backplane bus, avoiding any twisting motion that could bend guide pins.
3.Installation & Seating:Seat unit securely on baseplate power bus.
Align the RH101AA module with the baseplate guide tracks. Slide the module in smoothly until the rear power connectors engage completely with the backplane. Tighten retaining screws to secure the unit against vibration.
4.Power-On & Voltage Verification:Verify DC bus stability prior to loading.
Re-energize incoming AC power lines. Verify the front panel “Power OK” LED turns solid green. Measure the 24 V DC output rail at the test points to confirm voltage stays within the nominal 23.8 V to 24.2 V DC tolerance window under load.
RH101AA
RH101AA
Firmware/Software Versions & Upgrade Notes
- Firmware Dependency: Non-programmable hardware power supply module; contains no flash firmware.
- Compatibility: Fully compatible with Foxboro I/A Series baseplates supporting RH101 series power architectures, including redundant dual-power configurations.
- Hardware Revision Note: Ensure hardware revision levels match when installing modules in an N+1 redundant pair. Mixing legacy component revisions in parallel power feeds can cause uneven current sharing and premature thermal stress on the lower-revision unit.
Frequently Asked Questions (FAQ)
Is this Foxboro RH101AA unit brand new or refurbished?
This unit is strictly New Original / New Surplus. It originates from verified surplus reserves and has never seen operational service in a plant, ensuring clean electrical performance and full capacitor lifespan.
Why avoiding refurbished power supplies is critical for DCS reliability?
Power supplies contain high-stress components like electrolytic smoothing capacitors and switching transistors. Refurbished units often hide internal thermal degradation that causes excessive voltage ripple, triggering random CPU resets across connected fieldbus modules.
Can the power supply be hot-swapped while the node is running?
Yes, if the baseplate is configured with dual redundant power supply slots (N+1 setup) and the secondary supply is healthy. Removing one module in a non-redundant rack will immediately power down the entire node.
How does the handle line power fluctuations?
The unit incorporates auto-ranging input circuitry and high-capacity hold-up capacitors capable of riding through brief AC power drops without dropping the downstream 24 V DC backplane rail.
What is the expected operational lifespan of a New Surplus ?
When operated within specification (0–60°C ambient), a genuine new typically provides a 10 to 15-year operational lifespan, backed by our standard 1-year replacement warranty.
