Product Overview
3A99164G50 is a proprietary Eurocard-format printed circuit board belonging to legacy Westinghouse Ovation turbine control subsystem, specially designed for turbine speed regulation, valve position control and generator auxiliary closed-loop control of large-scale power station TG units. It processes analog speed feedback signals from turbine pickup sensors, servo drive feedback and protection switch input signals, outputs modulated drive signals to electro-hydraulic actuator servo valves for steam inlet flow adjustment. Mechanically fits standard Ovation main control rack slot layout, compatible with same-series 3A99164G02 base board hardware architecture for field interchange replacement without cabinet backplane modification. Widely deployed on boiler-turbine-generator coordinated control system (CCS) and EH hydraulic control cabinet of fossil-fired and nuclear power units.
Core Electrical Specifications
Operating supply: +5VDC, ±12VDC fed from rack PCPS backplane power module
Analog input channels: multi-channel speed pickup sine wave input (AC mV signal from turbine magnetic sensor), 4–20mA servo feedback signal input
Drive output: PWM modulated analog control output matching EH servo amplifier working standard
Built-in onboard signal filtering, surge suppression and overcurrent fuse protection for each signal channel
Onboard multi-group pluggable signal daughter card slots for optional function expansion and channel expansion
Environmental & Physical Parameters
Working ambient temperature: -10℃ ~ +60℃ inside sealed control cabinet; storage temperature: -40℃ ~ +85℃
Humidity: 5%~95%RH non-condensing, anti-corrosion coating applied on PCB surface for harsh power plant control room EMC environment, conforms IEC61000 industrial anti-interference specification
Physical dimension: Standard Ovation single-height plug-in board; net weight approx 0.52kg
Installation & Operation Features
Direct plug-in installation on Ovation turbine control crate; supports online cold swap during unit standby maintenance without full cabinet power cutoff. Front edge equipped test points for multimeter onsite signal measurement, onboard indicator LEDs for power status, channel fault and servo abnormal alarm indication to accelerate field troubleshooting. Most critical turbine cabinets adopt dual redundant configuration with two 3A99164G50 for uninterrupted governing control operation.
Spare Part Supply & Warranty
Original Emerson/Westinghouse OEM production discontinued; available inventory includes original surplus new stock and professionally bench-tested refurbished units, all items undergo full signal simulation testing before delivery. Global shipping via DHL/UPS/Fedex, standard factory test warranty 12 months after shipment.
Typical Fault Troubleshooting
Turbine speed control drifting: onboard input circuit aging or loose contact of pickup signal terminal
Servo valve hunting oscillation: damaged filter capacitor on output drive circuit of 3A99164G50
Channel no output: blown channel dedicated onboard small fuse or damaged output power driver chip
Full board no response: abnormal rack backplane supply voltage or PCB gold finger oxidation leading poor contact.
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