Woodward EM-80-3522-1009

Technical Specifications (Core Parameters Bold)

Electrical Control Parameters

• Nominal Control Input Signals: Dual compatible input 0–5 VDC analog voltage, 4–20 mA analog current
• Rated Operating Supply Voltage: 24 VDC genset battery power supply; allowable range 18–32 VDC
• Maximum Steady-State Operating Current: 1.8 A at full stroke displacement
• Peak Inrush Current: 3.2 A during initial stroke actuation
• Position Feedback Signal: Integrated internal LVDT linear position sensor output 0–5 VDC proportional to travel

Mechanical Stroke & Performance

• Total Full Linear Stroke Travel: 80 mm maximum mechanical displacement
• Linear Position Repeatability Error: ≤ ±0.02 mm closed-loop LVDT feedback control
• Full Stroke Response Time: ≤ 120 ms from minimum to maximum fuel position
• Maximum Actuating Thrust Output: 110 N continuous linear pushing force
• Operating Mechanical Cycling Lifespan: ≥ 20,000,000 full stroke cycles rated

Environmental & Physical Ratings

• Operating Ambient Temperature Range: -40 °C ~ +125 °C (engine surface mounting compatible)
• Storage Temperature Range: -50 °C ~ +130 °C
• Vibration Compliance: IEC 60068-2-6, 10–2000 Hz continuous engine vibration resistance
• Shock Compliance: IEC 60068-2-27 50 g industrial mechanical shock rating
• Enclosure Environmental Rating: IP54 dust and splash water protection
• Mounting Interface: Standard SAE J1940 engine flange mounting pattern
• Overall Assembly Dimensions: 225 mm (length retracted) × 92 mm outer housing diameter
• Net Weight: 3.7 kg

Functional Features

1. Integrated built-in LVDT linear position sensor delivers closed-loop fuel rack position feedback to speed governor hardware
2. Dual analog input compatibility (0–5 VDC / 4–20 mA) supports all Woodward genset controller product lines
3. 80 mm long linear stroke adapts to medium and large bore diesel/gas engine fuel rack assembly designs
4. Wide -40°C to +125°C temperature rating allows direct mounting on hot engine block surfaces without heat shielding
5. IP54 sealed metal housing resists engine oil mist, coolant splash, workshop dust, and light rain exposure
6. High 110 N continuous thrust eliminates fuel rack mechanical binding during high-load engine operation
7. 20 million full-cycle service lifespan minimizes mid-engine overhaul actuator replacement downtime
8. SAE standard flange mounting interface enables drop-in replacement for legacy Woodward EM series actuator models

Working Principle

Material Composition & Structural Characteristics

• Outer housing: Machined high-strength aluminum alloy with hard anodized corrosion resistant coating
• Actuator plunger and push rod: Hardened chromium alloy steel with low-friction precision grinding surface
• Electromagnetic coil winding: High-temperature polyimide insulated copper magnet wire
• LVDT sensor assembly: Hermetically sealed stainless steel submodule integrated inside main housing
• Sealing components: Viton high-temperature rubber shaft seal and perimeter housing gaskets
• Mount flange: Cast ductile iron SAE standard mounting base with threaded bolt holes
• Return spring: Tempered silicon-chromium alloy compression safety return spring

Advantage Highlights

1. Integrated LVDT closed-loop feedback eliminates external separate position sensor installation cost and wiring complexity
2. -40°C to +125°C extreme wide temperature tolerance permits direct engine surface mounting without auxiliary cooling hardware
3. IP54 environmental protection withstands engine bay oil mist, coolant splashes and industrial workshop contamination
4. Dual analog signal input design achieves universal compatibility with all Woodward genset control hardware platforms
5. 80 mm extended stroke accommodates large displacement fuel rack assemblies for medium/high power generator engines
6. SAE standardized flange mounting pattern supports direct one-to-one replacement of prior EM series actuator variants

Applicable Industries

Installation Requirements

1. Secure mounting flange to engine fuel rack bracket using grade 8 steel bolts torqued to manufacturer specified 28 Nm tightening force
2. Align push rod coaxial with engine fuel rack to eliminate side load mechanical binding during stroke movement
3. Route actuator wiring harness away from hot exhaust manifolds and high-voltage ignition wiring with minimum 30 cm separation distance
4. Retain factory-installed shaft wiper seal to prevent engine oil ingress into internal actuator assembly
5. Complete governor closed-loop position calibration mandatory post-installation to match fuel rack travel limits

Usage Precautions

1. Side loading on push rod during operation will scratch hard chrome surface and damage internal low-friction bearings
2. Operating temperature exceeding +125°C sustained will degrade Viton shaft seal and cause oil contamination inside actuator housing
3. Power supply voltage falling below 18 VDC results in insufficient thrust and unstable engine speed regulation
4. Do not disassemble hermetically sealed LVDT submodule; internal sensor calibration is factory-locked and non-serviceable on-site
5. Failure to perform post-mount position calibration creates engine overspeed or underfuel load rejection operational faults