Description
The Woodward PGA-EG 200 is an electro-hydraulic governor/actuator configured for large marine engines, power-generation systems, and industrial turbines. It integrates a mechanical-hydraulic governor backup system with an electronic actuator, accepting a 4–20 mA or 20–160 mA control signal from an external electronic engine management unit. The PGA-EG 200 delivers a maximum work output capacity of 200 ft-lb (271 J) to regulate the engine fuel racks or valves, ensuring continuous operation even during a total loss of electronic control signals.
Technical Specifications
| Parameter | Value / Specification |
|---|---|
| Brand / Manufacturer | Woodward |
| Model / Series | PGA-EG 200 |
| Product Type | Electro-Hydraulic Governor / Actuator |
| Maximum Work Capacity | 200 ft-lb (271 J) |
| Input Control Signal | 4–20 mA or 20–160 mA (model variant specific) |
| Backup Mode | Mechanical-hydraulic speed control |
| Hydraulic Fluid Pressure | 100 to 400 psi (6.9 to 27.6 bar) internal operating pressure |
| Output Shaft Rotation | Linear or rotary output options (standard 30° to 42° travel) |
| Operating Temperature Range | −29 to +93 °C (−20 to +200 °F) |
| Electrical Enclosure Class | IP56 / NEMA 4 equivalent (verify specific hazardous location certifications) |
| Weight | Approx. 54 kg to 73 kg (120 lb to 160 lb) depending on oil reservoir options |
Commercial and Availability Logistics
- Product Condition: New Original (New Surplus) or Refurbished (fully tested to OEM calibration specifications).
- Warranty: 12-month technical warranty covering mechanical and electronic performance.
- Availability: Built-to-order or available from ready stock depending on specific sub-model configuration and base-to-shaft orientation. Standard lead time for stock variants is 3 to 5 business days.
- Pricing Notice: Price is subject to configuration parameters, selected options, and market component costs. Contact us for a formal commercial proposal.
Engineering Considerations and Field Deployment Notes
Electronic-to-Mechanical Transition
The primary operating mode utilizes the electronic actuator section to position the terminal shaft based on the analog control input. If the electronic signal drops below the minimum threshold (e.g., <3.5 mA for a 4–20 mA system) or electrical power fails, the internal hydraulic transfer valve shifts control to the mechanical governor section. The mechanical speed setting must be adjusted slightly below the electronic operating speed to prevent tracking conflicts during normal operation.
Hydraulic Oil Maintenance and Viscosity
The PGA-EG 200 relies on clean, high-grade hydraulic fluid to prevent pilot valve sticking. In field installations, oil degradation is the leading cause of hunting and sluggish response. The unit handles viscosity ranges between 100 and 300 SSU at operating temperatures. For standard industrial sites, ISO VG 32 or ISO VG 46 turbine oil is recommended. Change filters and fluid after the first 50 hours of commissioning, and every 3,000 hours thereafter.
Linkage Adjustment and Backlash
Ensure the mechanical linkage between the governor output shaft and the fuel rack is direct, free of binding, and exhibits zero backlash. Any mechanical play or excessive friction in the linkage will cause system instability, manifesting as speed oscillations at specific load intervals.
Frequently Asked Questions
What happens if the external electronic controller fails completely?
The PGA-EG 200 automatically drops back to its mechanical flyweight governor function. The engine will continue to run at the speed determined by the mechanical speed-setting mechanism (either pneumatic or manual dial), preventing an immediate, unscheduled shutdown of critical generation or propulsion machinery.
Can this unit be configured for both clockwise and counter-clockwise input drive rotation?
Yes. The internal oil pump must be configured at the factory or adjusted by a certified technician to match the engine drive shaft rotation (CW or CCW). Operating the unit with the incorrect pump orientation will prevent hydraulic pressure accumulation, rendering the governor inoperable.
How do I verify if my unit uses the 4–20 mA or 20–160 mA coil?
Check the complete part number stamped on the Woodward nameplate. The specific suffix dictates the coil resistance and current requirements. Applying a 160 mA signal to a 4–20 mA coil will destroy the internal actuator component.
Technical Notice: Check the specific Woodward manual matching your configuration suffix (e.g., manual 36693 or 03224) to confirm exact terminal connections, calibration procedures, and pressure settings before commissioning the unit.
