Technical Specifications
- Control Channel Count: 1 bidirectional isolated 4–20 mA positioning control channel
- Output Control Signal Standard: 4–20 mA DC analog valve drive signal
- Input Feedback Signal Standard: 4–20 mA valve stroke position feedback signal
- Loop Load Resistance Max: 750 Ω for output control loop
- ADC/DAC Conversion Resolution: 16-bit bidirectional digital-analog conversion precision
- Galvanic Isolation Voltage: 2000 V AC between field loop and DCS internal ESB bus circuit
- Explosion Protection Grade: Ex ia IIC T6 intrinsic safety (S41101 specific variant parameter)
- Backplane Communication Bus: Centum VP ESB rack bus
- Power Supply: Supplied via FCU rack backplane +24 V DC internal power
- Operating Power Consumption: 4.2 W maximum
- Physical Dimensions: 107.5 mm (W) × 130 mm (H) × 32.8 mm (D)
- Net Weight: 195 g
Functional Features
- Bidirectional dual-loop design for valve drive signal output and position feedback signal acquisition in single module
- Built-in full closed-loop PID auxiliary regulation logic to reduce FCU main calculation load
- Hardware intrinsic safety circuit compliant with IEC 61241 standard for Zone 1 hazardous process areas
- Automatic valve stroke self-calibration function via DCS workstation one-click operation
- Real-time valve stick-slip, open-circuit, short-circuit and over-range fault diagnosis
- Front panel LED indicators for communication running, control output active, feedback signal normal, field fault alarm
- Support HART digital signal superimposition on 4–20 mA loop for smart positioner parameter reading/writing
Performance Parameters
- Output current linearity error: ≤ ±0.02% FS across full 4–20 mA range
- Feedback signal measurement accuracy: ±0.03% full scale
- Valve positioning closed-loop control response time: ≤ 200 ms
- HART communication baud rate: 1200 bps FSK digital modulation
- Operating temperature range: 0 °C ~ +55 °C
- Storage temperature range: -20 °C ~ +70 °C
- Relative humidity operating range: 5% ~ 90% non-condensing
Material Composition
- Module enclosure: Black flame-retardant ABS industrial plastic housing
- Main PCB: High-temperature FR-4 flame retardant circuit board with gold-plated ESB backplane fingers
- Isolation components: High voltage isolation transformers for bidirectional 4–20 mA loops
- Intrinsic safety components: Certified explosion-proof safety barrier resistors and capacitors
- Wiring terminals: Nickel-plated copper alloy spring pressure clamp terminals
Structural Characteristics
- Standard horizontal FCU rack plug-in module with front panel quick lock buckle
- Rear dedicated ESB bus gold finger strip for backplane data communication
- Independent isolated PCB zones separating internal DCS circuit and hazardous-area field loop circuit
- Front panel detachable transparent protective cover covering all wiring terminals
- Uniform mechanical dimension matching all Yokogawa AFV series actuator control modules
Working Principle
Centum VP FCU transmits target valve opening percentage command to AFV10D-S41101 via ESB backplane bus. Internal DAC chip converts digital opening value into isolated 4–20 mA analog drive signal to control field valve positioner. Simultaneously, valve stroke feedback 4–20 mA signal is sampled by onboard ADC chip and converted to digital position value. The module internal auxiliary closed-loop logic compares target value and actual feedback value, automatically adjusting output current to eliminate valve position deviation; all abnormal loop status signals are isolated and uploaded to DCS operation station for fault alert and event logging. Superimposed HART digital signals are demodulated to read smart positioner diagnostic data.
Advantage Highlights
- Single-module bidirectional drive & feedback integration reduces rack slot occupation for regulating valve control loops
- S41101 variant with full intrinsic safety certification allows direct wiring to Zone 1 explosive hazardous field areas
- Built-in auxiliary closed-loop PID reduces main FCU computing resource consumption for mass regulating valve systems
- Native HART superimposition support realizes remote smart positioner parameter configuration without additional HART interface cards
- Ultra-high 16-bit conversion precision eliminates valve positioning dead zone and flow fluctuation
- Full mechanical and software compatibility with Centum VP DCS and safety instrumented SIS control systems
Applicable Industries
Petrochemical refinery regulating valve control, natural gas processing plant hazardous area loop control, pharmaceutical explosion-proof batch production, coal chemical process flow regulation, thermal power plant boiler fuel & steam valve closed-loop control
Product Series
Yokogawa AFV Actuator Control Module Series (AFV10D single channel valve positioner module, AFV30D multi-channel actuator drive module)
Installation Requirements
- Insert horizontally into Centum VP FCU ESB backplane rack slot and fully lock front panel buckle
- Field 4–20 mA loop wiring must use intrinsically safety certified shielded twisted pair cables for Zone 1 deployment
- Total loop resistance of valve positioner and field cable cannot exceed maximum allowable 750 Ω load resistance
- Maintain minimum 10 mm air gap between adjacent rack modules for cabinet heat dissipation
- Complete valve stroke self-calibration operation after finishing all field wiring connection
Use & Maintenance Precautions
- Do not connect field loop load resistance exceeding 750 Ω, which causes incomplete valve stroke adjustment
- Cut off FCU rack main power supply before plugging/unplugging module to avoid ESB bus chip surge damage
- Intrinsic safety wiring must strictly follow IEC 61241 barrier matching rules; prohibited mixing non-IS wiring on same channel
- Inductive valve positioner loads do not require external freewheel diodes, onboard surge protection circuit integrated
- Regularly tighten terminal block spring screws every 6 months to prevent loose wiring signal drift
- Avoid installation inside cabinets with high-concentration flammable vapor without explosion-proof cabinet housing
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