VMIC VMIVME-4900 Synchro/Resolver Converter Board

Module Feature

VMIVME-4900 is a single-slot 6U VMEbus digital-to-synchro/resolver converter module developed by VMIC (GE Fanuc / Abaco Systems). It contains two fully independent conversion channels, converting digital angle value into analog synchro (3 wire) or resolver (4 wire) AC excitation signals to simulate rotary position feedback. It adopts 14-bit conversion architecture with overall angle accuracy ±4 arc minutes. Output power rating options:1.5 VA,4.5 VA,5.0 VA;compatible with high-power synchro booster amplifiers. Internal precision isolation transformers separate VME digital domain and analog synchro field side,eliminating ground loop interference. VME bus interface supports A16 short I/O addressing,nonprivileged or supervisory access,D08/D16/D32 data transfer,works as VME slave. Built-in real-time and offline BIT diagnostic circuit monitors reference excitation,output amplitude and internal hardware health;front panel FAIL LED indicates fault status for rapid fault isolation. Front panel AMP D-type connector provides field wiring interface. Rugged Eurocard PCB with conformal coating,shock and vibration screened for power plant cabinet environment,widely used in aerospace flight motion simulation,turbine rotary position emulation,defense ground test bench and hardware-in-loop real-time simulation VME chassis.

Working principle

VME host writes digital angle setpoint to onboard registers. The digital-to-synchro core calculates sine and cosine components of target angle,generates amplitude-modulated AC signals,amplified and output via internal transformers to synchro/resolver field equipment. BIT circuit injects test commands and samples output signal to verify channel integrity. VME FPGA completes address decoding and bidirectional data handshake between VME backplane and angle register bank. Isolation transformer blocks common-mode surge and noise from field side.

Onboard components

VME interface FPGA,dual 14-bit D/S conversion core,precision isolation transformer array,AC excitation generation circuit,BIT fault detection logic,angle register bank,VME J1/J2 edge connector,front-panel AMP D-type field connector,fault status LED.

LED indicators

Front panel LED indicators for module FAIL fault alarm.

Hardware self-diagnosis

Visual inspection of PCB,components and solder joints;board ID register readback verification;angle output static accuracy test;BIT excitation and amplitude loopback check;VME A16 read/write communication test.

Programming software

VMIC intelligent I/O driver library and configuration utility,supports VxWorks,Linux and QNX real-time operating systems;software tool for angle value programming and BIT fault log reading.

Electrical & Process Parameters

Model: VMIVME-4900 Brand: VMIC Device type: 6U VMEbus dual-channel digital-to-synchro/resolver module Bus standard: VMEbus, A16 addressing, D08/D16/D32 transfer Channel:2 independent synchro/resolver output channels Resolution:14 bit Accuracy:±4 arc min Output power:1.5 VA / 4.5 VA / 5.0 VA selectable Wiring mode:3 wire for synchro,4 wire for resolver Control mode: VME slave access,real-time & offline BIT,self fault isolation,galvanic transformer isolation Power supply: +5 V from VME backplane Cooling: Convection cooling Protection: Isolation transformer,overvoltage clamping,ESD protection Mounting: Standard single-height 6U VME front panel ejector locking Protection class: PCB with optional conformal coating

Mechanical & Structure

Mounting: Single-slot 6U VME Eurocard Protection class: PCB with optional conformal coating

Environmental

Operating temperature:-40℃ ~ +85℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification: CE compliant Status: VMIC 6U VME dual channel synchro/resolver simulation board

Installation

Follow ESD safety procedure before handling.Fully power off VME chassis.Insert VMIVME-4900 into vacant 6U VME slot and lock front panel ejector latches.Select VA power rating by onboard jumpers,connect synchro/resolver field wiring to front AMP D connector.Power on chassis,load VMIC I/O driver,run BIT diagnostic and angle calibration before commissioning.

Interface

VME J1/J2 backplane connector,front-panel AMP D-type synchro/resolver field connector,fault status register pins.

Diagnostic

Board undetected: poor VME backplane contact,damaged edge connector or incorrect A16 address setting. Angle output deviation: BIT fault or transformer circuit drift. No AC excitation output: power supply anomaly or excitation oscillator failure. FAIL LED lit: overvoltage or internal hardware damage detected by BIT.

Product Brief

VMIC VMIVME-4900 single height 6U VME dual-channel digital-to-synchro/resolver board,14-bit high precision angle conversion with internal isolation transformer and BIT fault detection,for aerospace motion simulation and turbine rotary position emulation HIL VME systems.