3A99165G50 Servo Amplifier Module | Emerson Ovation DEH Turbine EH Control_Ningde Androld Automation Equipment Co.,Ltd.

June 05, 2026

3A99165G50 Servo Amplifier Module | Emerson Ovation DEH Turbine EH Control

3A99165G50 is drop-in interchangeable with G01/G02/G03/G04/G52/G05 standard models, single-width Eurocard form factor for standard Ovation rack installation without cabinet wiring modification. Core function: Receive ±10VDC analog/PWM valve setpoint command from upper master controller card; convert control signal into precision constant driving current for EH servo solenoid; collect multi-channel LVDT AC feedback signal to realize full closed-loop positioning of main stop valve, governing valve and HP/LP bypass valve of steam turbine. Key customization vs standard G05: Optimized high-current power output circuit, military-grade PCB three-proof coating, upgraded multi-stage surge suppression and EMC filter components, parameter tuned for oversized high-impedance servo coils used on 600MW/1000MW class large turbine units.

Description

1. Product Introduction

3A99165G50 is drop-in interchangeable with G01/G02/G03/G04/G52/G05 standard models, single-width Eurocard form factor for standard Ovation rack installation without cabinet wiring modification.

Core function: Receive ±10VDC analog/PWM valve setpoint command from upper master controller card; convert control signal into precision constant driving current for EH servo solenoid; collect multi-channel LVDT AC feedback signal to realize full closed-loop positioning of main stop valve, governing valve and HP/LP bypass valve of steam turbine.

Key customization vs standard G05: Optimized high-current power output circuit, military-grade PCB three-proof coating, upgraded multi-stage surge suppression and EMC filter components, parameter tuned for oversized high-impedance servo coils used on 600MW/1000MW class large turbine units.

2. Electrical Specifications

Backplane supply: +5VDC, ±12VDC, powered by rack 3A99132 series PCPS power supply module
Command input: ±10VDC differential analog / PWM pulse width modulation control signal
Rated adjustable output drive current: 0~±50mA constant current (max upgrade in full 3A99165 series, for heavy-load servo coils)
Feedback port: Multi-group low-level AC input for LVDT valve position transducer connection
Onboard protection: Independent channel fuse, transient voltage suppression array, precision gain trim potentiometer, overheat, overcurrent & short-circuit latch protection, multi-layer RC anti-interference filter network

3. Environmental & Mechanical Parameters

Operating temperature: -15℃ ~ +72℃ inside control cabinet; storage: -40℃ ~ +90℃
Humidity: 5%~95%RH non-condensing; full PCB with enhanced salt-fog, damp and mould resistant conformal coating per nuclear power specification
EMC standard: IEC61000-6-2 industrial heavy anti-interference, resistant to high-frequency interference from cabinet contactors, frequency converters and power harmonics
Dimension: Standard Ovation single slot Eurocard dimension, unified mounting outline compatible with all 3A99165 series cards

4. Front Panel Indication & On-site Maintenance

Front panel 4-channel LED status indicator: Power OK, Input Command Fault, Output Overload, LVDT Feedback Failure; reserved test pin terminals for multimeter calibration and loop tuning during commissioning.

Supports hot plug replacement under live rack power; critical turbine governing loops commonly deploy redundant dual 3A99165G50 configuration for uninterrupted servo control.

5. Supply Status & Common Troubleshooting

Original OEM new production stopped; available stock includes surplus original unused stock and fully bench-tested refurbished units with standard 12-month global warranty.

Zero output drive: Blown onboard channel fuse or damaged final-stage power amplifier chip
Valve hunting/oscillation: Degraded filter capacitors or drifted gain potentiometer value
Gradual valve position drift: Aging LVDT preamplifier circuit or oxidized PCB gold finger contact

Contact Info