Description
Product Core Brief
- Model: 3A99158G01
- Brand: Westinghouse
- Series: Listed under Westinghouse Ovation, WDPF and WESStation spare ranges
- Core Function: Serves as a Westinghouse DCS card in legacy control cabinets, with the exact function depending on the platform and revision in your rack.
- Product Type: DCS control system card, function unconfirmed without nameplate
- Key Specs: Westinghouse DCS heritage | Cabinet mounted | Requires platform and drawing verification
- Condition: New Surplus / Pulled Used, nameplate photo required
Product Introduction
WESTINGHOUSE 3A99158G01 is a Westinghouse DCS card that circulates mostly through reseller stock lists rather than factory documentation. Suppliers group it with Ovation, WDPF and WESStation hardware, which tells you the family but not the function.
That gap is the real risk. Some listings call it a PLC module, others claim it can be configured as an RTD input card with 16 channels and 115V, numbers that look pasted from another product page. Confirm the platform, the backplane and your cabinet drawing before spending anything.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 3A99158G01 |
| Brand | Westinghouse |
| Platform Grouping | Ovation, WDPF and WESStation spares per supplier listings |
| Product Class | DCS card, function unconfirmed without nameplate |
| Common Reseller Claim | Generic PLC or automation module |
| Another Reseller Claim | Configurable RTD input, 16 channels, 115V, 500 I/O points |
| Related Numbers In Same Listings | 1C31238H01, 3A99132G02, 3PCPS05, 3A99266G01 |
| Verification Method | Nameplate photo, cabinet drawing, backplane type, platform version |
| Typical Failure Signs | Dead slot, no communication to controller, wrong scaling, random channel faults |
| Environment | Climate controlled cabinet, low dust, single point grounding |
| Unverified Claims | Power supply, Ethernet link card, standalone PLC CPU, universal RTD and TC input |
| Support Path | Original Westinghouse or Emerson project files, not reseller write-ups |
No confirmed factory datasheet is publicly available for this number, so treat every spec on a reseller page as a guess.
Quality Control Process
Unknown cards get identified first, tested second.
- Nameplate and revision photo. Confirm the full suffix, since a G and H ending often means different revisions or different functions.
- Backplane and slot check. Match the connector key and card depth against your rack before forcing anything in.
- Visual board inspection. Look for bulged electrolytics, cracked solder joints and burned optocouplers, the usual marks of an aged DCS card.
- Continuity trace with a Fluke multimeter. Probe terminal block to connector pins so you know which signal lands where.
- Signal injection if it is an input card. Feed a known 4 to 20mA or RTD resistance and confirm the value scales correctly in the faceplate, not just that it moves.
- Insulation and ground check with a Megger on the field side, since a grounded common kills multiple channels at once.
- ESD bag with desiccant. Pulled surplus often sits in humid warehouses for years, and dry pack failure causes silent damage.
I once bought a card because the listing said analog input. It was a personality module. Two days lost reading old drawings.
Replacement Pitfall Guide
❗ Trusting the first listing you find. Pages calling this a generic PLC module with one year warranty and flat pricing are catalog dumps, not verified stock. Ask for a nameplate photo and the cabinet it came from.
❗ Believing RTD or thermocouple claims. Some pages describe it as configurable for RTD with 16 channels and odd voltage figures, which does not match how Westinghouse DI, AI and PMOD families are normally numbered and documented.
❗ Ignoring the platform split. Ovation, WDPF and WESStation are different generations with different backplanes and configuration tools. A card from one will not simply drop into another.
❗ Skipping scaling and point configuration. Even a working card reads wrong if scaling, range or scan class is off. Check the point config before blaming hardware.
❗ Forcing a card into a keyed slot. Bent pins ruin both the card and the backplane, and backplane repair means a planned outage.
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 3A99158G01 | Refurbished same part | Needs Verification | Confirm full suffix, nameplate, board condition and platform |
| WESTINGHOUSE 3A99158G01 | 3A99132G02 | Needs Verification | Appears in the same reseller listings, not proof of interchangeability |
| WESTINGHOUSE 3A99158G01 | 3A99266G01 | Needs Verification | Grouped in supplier stock pages only, verify function first |
| WESTINGHOUSE 3A99158G01 | 1C31238H01 DI PMOD | Not Compatible | Ovation personality module for 48VDC contact inputs |
| WESTINGHOUSE 3A99158G01 | Ovation AI or AI PMOD pair | Needs Adaptation | Requires matching E-Mod, PMOD, wiring and point scaling |
| WESTINGHOUSE 3A99158G01 | Ovation upgrade with modern I/O | Needs Adaptation | Full re-engineering, rewiring, logic migration and factory acceptance testing |
Benchmark references
- Acceptance criterion: injected signal reads within about 0.5 percent of applied value across the full range with no drift over a 24 hour watch.
- Stability target: no false channel change during large motor starts and VFD switching, with shields grounded at one point only in the control cabinet.
