Description
Product Core Brief
- Model: 3A99200G01
- Brand: Westinghouse / Emerson Ovation heritage
- Series: Listed under Ovation, WDPF and general Westinghouse DCS spares
- Core Function: Acts as a PCI bus backplane carrying signals between the processor board and plugged PCI devices in an Ovation style chassis, per reseller descriptions.
- Product Type: PCI backplane, passive carrier board
- Key Specs: PCI bus interface | Multiple slots for PCI devices | Modular chassis configuration
- Condition: New Surplus / Pulled Used, nameplate photo required
Product Introduction
WESTINGHOUSE 3A99200G01 is widely described as an Ovation PCI backplane, a carrier board using the PCI bus to link the processor with plugged devices and provide a stable data path inside the cabinet. It runs no logic and conditions no field signal.
The value is being the part nobody thinks about until slots go dead. Reseller pages also dump it into generic Westinghouse DCS lists with no spec at all, so treat the PCI backplane description as a strong lead, not proof. Confirm against your chassis drawing.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 3A99200G01 |
| Brand | Westinghouse, Emerson Ovation heritage |
| Product Class | PCI backplane, passive carrier board per reseller descriptions |
| Bus Type | PCI |
| Slot Support | Multiple slots for PCI devices, allowing system expansion |
| Design Approach | Modular, configured around the chassis and cards installed |
| Common Failure Signs | Dead slot, intermittent card recognition, bus errors, random reboots |
| Related Chassis Items | Racks, plugin frames, fans, power supplies and cables in Ovation lists |
| Verification Method | Chassis drawing, connector key, slot count, board revision, nameplate photo |
| Unverified Claims | AI or DI card, power supply, Ethernet link card, standalone controller |
| Environment | Climate controlled cabinet, low dust, stable cooling, single point grounding |
| Support Path | Original Ovation or WDPF documentation, not reseller copy |
Public listings repeat the same paragraph across sites, so there is no reliable factory datasheet to lean on here.
Quality Control Process
Backplanes get inspected and traced, not flashed.
- Nameplate and revision photo. Confirm the suffix and board revision, since chassis generations change connector layouts.
- Connector and slot inspection. Look for bent pins, cracked plastic, scorched areas and dust packed into the slot.
- Continuity trace with a Fluke multimeter. Probe slot pin to pin across the bus to find broken traces or cold solder.
- Insulation and short check with a Megger between bus lines and chassis ground, since a short kills every slot at once.
- Signal trace with an oscilloscope on the bus clock and reset lines with a known good processor installed.
- Thermal check after a warm run. Use an infrared gun on voltage regulators near the backplane, because heat kills adjacent boards first.
- ESD bag and dry pack. Store with desiccant, since pulled boards often sit in damp storage for years.
I once blamed a processor for random bus faults. A single bent slot pin on the backplane was shorting two lines.
Replacement Pitfall Guide
❗ Buying it as an I/O or power card. Many stock pages list it beside DI, AI and power supplies with zero description, sometimes even with placeholder pricing. Read the board, not the page.
❗ Assuming PCI means plug and play. Slot count, keying, bracket height and power draw per slot vary. A wrong board will not seat cleanly or will starve the supply.
❗ Ignoring total backplane power draw. Every added PCI card pulls from the same rail. Load up the slots and the supply browns out during motor starts, looking like random card failure.
❗ Overlooking dust and cooling. Packed dust insulates regulators and raises board temperature fast. Clean the chassis, verify the fan spins, then retest.
❗ Skipping ground discipline. Ground loops between the chassis, shields and cabinet earth create bus errors and phantom faults. Keep one ground point.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| WESTINGHOUSE 3A99200G01 | Refurbished same part | Needs Verification | Confirm revision, slot keying, trace continuity and insulation |
| WESTINGHOUSE 3A99200G01 | Other Ovation PCI backplane revision | Needs Verification | Check bracket, slot count, power budget and BIOS or driver support |
| WESTINGHOUSE 3A99200G01 | 3A59104G02 plugin frame | Not Compatible | Frame or rack hardware, different mechanical and electrical role |
| WESTINGHOUSE 3A99200G01 | 3A99732H03 VME board | Not Compatible | Different bus family, no direct swap |
| WESTINGHOUSE 3A99200G01 | Modern industrial motherboard with PCIe | Needs Adaptation | Requires new chassis, cards, drivers and full logic migration testing |
| WESTINGHOUSE 3A99200G01 | Ovation upgrade with current generation hardware | Needs Adaptation | Full re-engineering, rewiring, FAT and operator training |
Benchmark references
- Acceptance criterion: every slot is recognized by the processor with no bus errors during a 24 hour warm run.
- Stability target: no brownout or reboot while all installed cards and cabinet loads switch at the same time.
