Product Overview
The ALSTOM MVAW11B1AB9007A is a specialized analog output interface module engineered for use in Alstom’s legacy Automatic Voltage Regulator(AVR),Automatic Generator Control(AGC),and turbine governor systems—widely deployed in hydroelectric,thermal,and nuclear power generation facilities from the 1990s through the early 2000s.As part of Alstom Power Automation’s modular I/O architecture(later integrated into GE Grid Solutions following corporate acquisitions),the MVAW11B1AB9007A serves as a critical link between digital control processors and field actuators,converting controller-generated setpoints into precise,isolated 4–20 mA or±10 V analog signals that drive excitation thyristor gates,servo valves,or auxiliary control devices.
Designed for deterministic performance in electrically harsh environments,the ALSTOM MVAW11B1AB9007A features galvanic isolation between channels and from the backplane bus,ensuring signal integrity even when installed near high-current switchgear or variable-frequency drives.Each module typically provides 4 to 8 analog output channels(exact count may vary by firmware revision),with high linearity(<0.1%full scale)and fast response times(<10 ms)to support closed-loop stability in dynamic grid conditions.The unit mounts on standardized carrier boards such as the STO0982E01 or MVAC01,which supply regulated power,mechanical support,and field wiring terminals.Despite being discontinued,the MVAW11B1AB9007A remains in active service worldwide due to its rugged construction,long lifecycle,and seamless integration with existing Alstom control panels—making it a key component in brownfield asset reliability strategies.
Technical Specifications
Parameter Name Parameter Value
Product Model MVAW11B1AB9007A
Manufacturer ALSTOM(legacy;now under GE Grid Solutions support)
Product Type Analog Output Interface Module
Output Channels Typically 4–8(configurable per system setup)
Output Signal Types 4–20 mA(sink/source),±10 V,0–10 V
Load Capability 4–20 mA into≤500Ω;±10 V into≥1 kΩ
Accuracy±0.1%of full scale
Isolation 2.5 kV RMS(channel-to-channel and channel-to-bus)
Response Time<10 ms(step response to 90%)
Backplane Interface Proprietary parallel bus via carrier(e.g.,STO0982E01)
Power Supply+5 VDC and±15 VDC from backplane
Operating Temperature 0°C to+60°C
Mounting Plug-in module on DIN rail-mounted carrier board
Main Features and Advantages
Precision analog drive for mission-critical actuators:The MVAW11B1AB9007A delivers laboratory-grade output accuracy using low-drift DACs and precision op-amps,ensuring stable excitation current control during voltage sags,load rejection,or islanded operation—key for maintaining synchronism and preventing generator tripping.
Robust electrical isolation and fault tolerance:With 2.5 kV RMS isolation barriers,the module prevents ground loops and protects the control CPU from field-side transients or short circuits.Open-circuit and overrange detection per channel enhances diagnostic coverage,supporting predictive maintenance and reducing unplanned outages.
Seamless integration with legacy Alstom platforms:Designed specifically for Alstom UNITROL®AVRs and AGC-3000 systems,the MVAW11B1AB9007A requires no protocol converters or signal conditioning external to the rack.Its pinout and timing are fully compatible with original system specifications,enabling direct replacement during refurbishment.
Service-friendly modular design:The module slides into standardized carriers without tools,allowing hot-swap capability in redundant configurations.Front-panel LEDs indicate power and channel status,while screw-terminal field wiring simplifies calibration and loop testing during commissioning or outage windows.
Long-term availability through certified refurbishment:Although no longer manufactured,the MVAW11B1AB9007A is supported by a global network of authorized service centers that provide function-tested,recalibrated units with traceable documentation—ensuring continued operational continuity for aging power infrastructure.
Application Field
The ALSTOM MVAW11B1AB9007A is primarily used in synchronous generator control systems where analog output fidelity directly impacts grid stability and equipment protection.In hydroelectric plants,it drives guide vane servomotors and excitation gate pulses based on speed and voltage regulator commands,enabling rapid response to frequency deviations.In coal-and gas-fired thermal stations,the module outputs excitation reference signals to thyristor bridges in UNITROL®systems,maintaining terminal voltage within±1%during load ramps or fault ride-through events.
Nuclear power facilities employ the MVAW11B1AB9007A in non-safety-related but essential auxiliary voltage regulation panels,such as station service transformers or diesel generator excitation controls.Industrial cogeneration sites in pulp&paper,steel,and petrochemical sectors rely on it for black-start coordination,where precise voltage buildup is required before reconnection to the grid.Across Europe,North America,and Asia,transmission system operators retain the MVAW11B1AB9007A during partial DCS upgrades due to its proven interoperability with legacy protection relays,SCADA RTUs,and analog field devices.Even in hybrid renewable installations using synchronous condensers for reactive power support,this module bridges modern digital controllers to legacy actuator infrastructure—extending plant life while deferring full system replacement.
Related Products
MVAW11B1AB9007B:Enhanced variant with improved noise immunity
MVAI11:Analog input counterpart module
MVDO21:Digital output module for same carrier platform
STO0982E01:Standard I/O carrier board compatible with MVAW11B1AB9007A
UNITROL 1000/6000:Excitation systems commonly using this output module
AGC-3000:Alstom Automatic Generator Control platform
GE IC695ALO600:Modern PACSystems analog output module for migration paths
MVAC01:Alternative carrier/backplane assembly
Installation and Maintenance
Pre-installation:Verify compatibility with the target carrier board and ensure the backplane supplies clean+5 VDC and±15 VDC.Confirm output scaling parameters in the host controller configuration(e.g.,AGC logic).Use shielded twisted-pair cables for all field outputs,grounding shields at the controller end only.Perform a dry-fit to ensure proper edge connector seating.
Maintenance:During scheduled outages,inspect for capacitor aging(especially in units>15 years old).Recalibrate annually using a precision source-measure unit(e.g.,Fluke 754 or Dranetz calibrator),verifying output linearity across 0%,25%,50%,75%,and 100%points.Monitor diagnostic logs for open-circuit alarms or DAC errors.Store spares in anti-static,climate-controlled packaging;power periodically to maintain electrolytic capacitor health.For critical applications,maintain a stock of refurbished MVAW11B1AB9007A modules with recent calibration certificates.
Product Guarantee
Originally manufactured under ISO 9001 quality standards,the ALSTOM MVAW11B1AB9007A was designed for a 20+year service life in continuous industrial operation.While production has ceased,certified refurbishers offer tested replacements with full functional validation,including thermal cycling and EMI resilience checks.Each refurbished unit includes a calibration report traceable to NIST or equivalent standards and carries a standard 12-month warranty against material and workmanship defects.This ongoing support enables power generators to sustain regulatory compliance,operational reliability,and grid code adherence—ensuring the MVAW11B1AB9007A remains a trusted asset in global energy infrastructure well into the 2030s.
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