1. Product Overview
Part No.: 3A99101G01, original Westinghouse/Emerson QSR Turbine LVDT Servo I/O Card, core module of classic WDPF DCS turbine control system, American original OEM production; suffix G stands for standard factory version PCB assembly, paired derivative model: 3A99101G02 (revised upgraded version). It is dedicated for steam turbine governing control, collecting displacement signals from 4-channel LVDT linear variable differential transformers and output servo drive control signals, widely used in thermal power & nuclear unit turbine rack cabinet VME slot installation. Original mass production discontinued, available stock includes factory-tested refurbished modules and disassembled original used spare parts.
2. Core Function & Channel Configuration
Input: 4 independent LVDT signal acquisition channels, compatible with 2AC type industrial LVDT displacement sensors for valve position, actuator stroke and turbine shaft displacement real-time sampling.
Output: Built-in servo driving circuit + position closed-loop feedback logic, realizes automatic regulation of turbine governing valve hydraulic actuator; completes position readback, deviation comparison and closed-loop PID control inside the board.
Bus Interface: Standard WDPF VME backplane bus, communicates with DPU master controller via cabinet backboard for parameter download, real-time data upload and fault alarm transmission.
3. Electrical & Environmental Parameters
Working power: +5VDC, ±12VDC powered by chassis backplane power supply module inside control cabinet.
Operating ambient temperature: 0℃ ~ +55℃ (cabinet continuous running); storage temperature: -40℃ ~ +85℃; relative humidity: 5%~95%RH non-condensing, no corrosive gas environment required.
Anti-interference design: Full PCB shielding layout, built-in EMI filter circuit to resist cabinet contactor, inverter and power module electromagnetic interference, meets CE industrial control component certification standard.
4. System Application Scope
Main spare part for steam turbine EH hydraulic control system of WDPF DCS power plant, installed in turbine dedicated VME control crate, cooperated with QRS(3A99108G01), QRF(3A99109G01), QRD(3A99114Gxx) series signal conditioning cards to form complete turbine control I/O group; used for unit routine maintenance, overhaul replacement and old DCS system renovation upgrade.
5. Supply & Delivery Terms
Brand new original factory stock is extremely scarce globally; stocked goods are pre-inspected refurbished modules with after-sales warranty and tested second-hand original parts. Standard delivery cycle: 2~3 working weeks; urgent emergency shipment available via DHL/UPS/FedEx global express; professional board-level repair service is supported for failed cards with 2~4 weeks standard repair lead time.
Get a Quote