3A99166G03 LVDT Excitation & Signal Conditioning Board_Ningde Androld Automation Equipment Co.,Ltd.

June 05, 2026

3A99166G03 LVDT Excitation & Signal Conditioning Board

3A99166G03 is the third revised upgrade variant of Ovation dedicated LVDT signal conditioning card, designed to pair with full-range 3A99165 series servo amplifier boards (3A99165G50/G51 etc.) and 3A99164 main control board for fossil & nuclear power plant DEH governing system. It is a single-width Eurocard for standard Ovation rack installation, fully pin-to-pin interchangeable with G0 base version with optimized circuit anti-interference design.

Description

1. Product Introduction

This module supplies fixed-frequency AC excitation power to field LVDT displacement sensors installed on turbine stop valves, control valves and bypass valves. It captures low-amplitude millivolt AC feedback signals from LVDT transducers, completes rectification, filtering and DC amplification, and outputs standardized ±10VDC analog valve position signals to downstream 3A99165 servo cards for closed-loop position regulation.

2. Key Electrical Specifications

Backplane power supply: +5VDC, ±12VDC powered by 3A99132 series rack power supply modules
Standard excitation output: 3kHz, 7VAC sine wave for multi-channel independent LVDT loops; G03 revision optimizes excitation amplitude stability against grid fluctuation
Onboard protection: TVS surge absorption, independent channel fuse, multi-stage RC filtering, overcurrent & short-circuit latch protection (improved fault self-locking performance vs original G0 edition)
Output signal specification: calibrated ±10VDC full-scale DC position output matching the input requirement of all 3A99165 servo series

3. Environmental & Mechanical Parameters

Operating temperature inside control cabinet: -15℃ ~ +72℃; storage temperature: -40℃ ~ +90℃
PCB full conformal coating: moisture-proof, mildew-proof and anti-salt spray coating optimized for high-humidity power plant cabinet environment
EMC compliance: IEC61000-6-2 industrial heavy-duty anti-interference standard, upgraded EMI filter circuit on G03 version to suppress interference from on-site contactors and frequency converters
Dimension: standard single-slot Ovation Eurocard, compatible with existing DEH rack slots for direct plug-in replacement without wiring modification

4. Front Panel & Installation Features

Front-mounted LED indicator lamps for power status and per-channel fault alarm; reserved test points for on-site multimeter inspection of excitation voltage and conditioned DC signal during commissioning and maintenance
Supports cold-swap replacement under rack standby status; critical turbine control loops generally adopt redundant card configuration to enhance system safety; G03 fixes minor zero drift defect existed on early G0 batches.

5. Spare Part & Basic Troubleshooting

Original OEM manufacturing is discontinued; available stock includes factory-tested refurbished modules and surplus original spare parts with standard 12-month warranty.

No LVDT excitation output: blown onboard channel fuse or abnormal backplane input power
Drifting/fluttering position signal: loose field wiring terminals or degraded filter components
DC output zero offset: aging preamplifier components or poor contact of PCB gold fingers (less frequent on G03 upgraded model)

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