Woodward 9905-211 Load Sharing Module

Woodward 9905-211 Load Sharing Module | 10-40 VDC Power

Availability: 99 left in stock

Product Overview The Woodward 9905-211 represents the digital evolution of the 2301A series, providing high-precision speed regulation and load management for engines...

SKU: 9905-211

Manufacturer: Woodward
Product No.: 9905-211
Product Type: Load Sharing Controls
Product Origin: USA
Payment:T/T, Western Union
Weight: 1800g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The Woodward 9905-211 represents the digital evolution of the 2301A series, providing high-precision speed regulation and load management for engines and turbines. This microprocessor-based unit monitors rotational speed via magnetic pickups and executes precise actuator commands to maintain frequency stability. Whether managing a standalone generator in isochronous mode or balancing multiple units on a parallel bus via droop control, the 9905-211 ensures proportional load distribution and prevents system oscillations.

Technical Specifications

The 9905-211 utilizes a wide DC input range and a standard milliamp output signal to interface with modern industrial actuators.

Parameter	Specification
Catalog Number	9905-211
Series	2301A Digital
Input Power	10–40 VDC (24 VDC Nominal)
Output Signal	0–20 mA Actuator Drive
Control Modes	Isochronous and Droop Speed Control
Speed Range	100 – 10,000 RPM (Sensor Dependent)
Interface Inputs	Magnetic Pickup (MPU), Analog Bias
Operating Temperature	-40°C to +85°C
Weight	4.00 lbs (1.8 kg)
Dimensions	250 mm × 180 mm × 60 mm

Engineering Advantages

Superior Digital Precision: The microprocessor-based architecture eliminates the drift associated with aging analog components. It provides repeatable, accurate speed sensing and faster response times to sudden load changes, which protects sensitive downstream electrical equipment.
Dual-Mode Versatility: The module supports both Isochronous and Droop modes. Operators can maintain a constant frequency for isolated mission-critical loads or implement a speed-drop curve for stable load sharing when paralleling with an infinite utility bus.
Wide Voltage Compatibility: The 10–40 VDC power input range accommodates fluctuating battery voltages during engine cranking or charging cycles, preventing control system resets during low-voltage transients.
Optically Isolated Load Sharing: To prevent ground loops in multi-generator installations, the 9905-211 utilizes isolated load-sharing lines. This ensures that the parallel signal between units remains clean and free from electrical interference, even over long cable runs between control panels.
Robust Actuator Driving: The 0–20 mA output signal provides a universal interface for a wide variety of Woodward and third-party fuel actuators, allowing for easy integration into both new builds and retrofit projects.

FAQs

Q: Can the 9905-211 replace older analog 2301A modules?

A: Yes. The 9905-211 serves as a digital upgrade for many 2301A applications. However, you must verify that your actuator accepts a 0–20 mA signal and that your system voltage falls within the 10–40 VDC range. Digital units often provide better stability and diagnostics than their analog predecessors.

Q: What is the benefit of the 0–20 mA output over a voltage bias output?

A: A current-loop signal (0–20 mA) is significantly more resistant to electromagnetic interference and voltage drops over long distances compared to a voltage-based signal. This makes the 9905-211 ideal for large engine rooms where the controller and actuator are physically separated.

Q: How do I handle a "Loss of Speed" signal?

A: The 9905-211 includes safety logic that detects a failed Magnetic Pickup (MPU). If the speed signal drops below the minimum threshold while the engine is supposed to be running, the module initiates a shutdown command to the actuator to prevent an uncontrolled fuel-rack condition.

Q: Is calibration required during installation?

A: Yes. You must adjust the gain, stability, and rated speed potentiometers to match the dynamic response of your specific engine or turbine. The digital core simplifies this process by providing a more linear and predictable response during the tuning phase.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.