Description
📌 Product Overview
The Woodward 9907-252 is an analog Load Sharing Module designed for generator set applications requiring coordinated load sharing between two or more engine-generator sets operating in parallel.
This model is designed for systems using a 24 VDC power supply and provides a 0.5–4.5 VDC output to a compatible speed control. The module monitors generator load and adjusts the speed-control reference to help balance the load between parallel generator sets.
The 9907-252 supports both isochronous and droop load-sharing operation. It can be used with Woodward electronic controls as well as compatible non-Woodward engine speed controls that accept the required analog speed-setting signal.
⚙️ Key Features
🔹 Analog generator load sharing
🔹 Designed for parallel generator applications
🔹 24 VDC nominal power supply
🔹 0.5–4.5 VDC speed-control output
🔹 Supports isochronous load sharing
🔹 Supports droop load-sharing operation
🔹 Compatible with Woodward and selected non-Woodward speed controls
🔹 Three-phase PT voltage sensing
🔹 Three-phase CT current sensing
🔹 Load gain adjustment
🔹 Droop adjustment
🔹 Compatible with Woodward SPM-A synchronizer applications
📋 Product Datasheet
🏷️ Brand: Woodward
🔢 Model: 9907-252
📚 Series: Load Sharing Module
🧩 Product Name: Load Sharing Module
⚙️ Primary Function: Generator Load Sharing
🔌 Nominal Power Supply: 24 VDC
⚡ Supply Voltage Range: 18–32 VDC
📤 Output Type: 0.5–4.5 VDC Analog
📊 Load Sharing Input: 0–3 VDC
🔌 PT Input: Three-Phase Potential Transformer Input
⚡ PT Input Range: 95–130 VAC Line-to-Line
🔌 CT Input: Three-Phase Current Transformer Input
📈 CT Input Range: 3–7 A RMS at Full Load
🔄 Load Sharing Modes: Isochronous and Droop
🎛️ Droop Adjustment: 0–11% Speed Reduction
📡 Synchronizer Compatibility: Woodward SPM-A Compatible
🌡️ Operating Temperature: -40°C to +70°C
💧 Humidity Capability: Tested at 95% Non-Condensing
📏 Approximate Dimensions: 273.6 × 59.2 × 214.1 mm
⚖️ Approximate Weight: About 1.4 kg
🏭 Typical Application: Parallel Generator Load Control
The official Woodward product specification identifies 9907-252 as the 24 VDC version with a 0.5–4.5 VDC analog output and isochronous or droop load-sharing capability.
🏭 Typical Applications
⚡ Parallel Generator Systems
The 9907-252 can be used when multiple generator sets operate together and their electrical loads need to be shared proportionally.
🚢 Marine Power Systems
Suitable for generator applications where coordinated load distribution between multiple prime movers is required.
🏭 Industrial Power Generation
Can be integrated into industrial generator control systems using compatible engine speed controls.
🔋 Standby Power Plants
Useful in multi-generator standby systems where several generator sets operate in parallel.
⚙️ Engine and Turbine Generator Systems
The module can work with compatible speed-control systems to modify the engine speed reference according to generator loading conditions.
🔧 Installation and Replacement Notes
Before installing a replacement 9907-252 module, verify the complete part number and the existing generator control architecture.
🔧 Confirm that the speed control accepts a 0.5–4.5 VDC reference signal.
🔧 Verify that the available power supply is within the 18–32 VDC operating range.
🔧 Check PT and CT wiring before connecting the replacement module.
🔧 Confirm the correct polarity and phase relationship of generator sensing connections.
🔧 Verify the load-sharing line wiring between parallel generator sets.
🔧 Use properly shielded wiring for low-level analog load-sharing and speed-reference signals.
🔧 Check grounding arrangements to reduce interference on analog control signals.
🔧 Configure the load gain adjustment during commissioning.
🔧 Set the required droop characteristic when operating in droop mode.
🔧 Perform synchronization and load-sharing tests before returning the generator system to normal service.
⚠️ Incorrect PT, CT, or load-sharing signal connections can cause improper generator load distribution. Installation and commissioning should be performed by qualified personnel familiar with generator paralleling systems.
❓ FAQ
Q: What is the Woodward 9907-252?
A: It is an analog Load Sharing Module used to help distribute electrical load between generator sets operating in parallel.
Q: What power supply does the 9907-252 require?
A: The module operates from a nominal 24 VDC supply, with an operating range of 18–32 VDC.
Q: What output does this model provide?
A: The 9907-252 provides a 0.5–4.5 VDC analog output for a compatible speed-control system.
Q: What is the difference between 9907-252 and 9907-173?
A: The 9907-252 uses a 24 VDC supply and provides a 0.5–4.5 VDC analog output, while the 9907-173 is a different Load Sharing Module configuration with a ±3 VDC analog output and AC supply.
Q: Does the 9907-252 support droop operation?
A: Yes. The Load Sharing Module supports both isochronous and droop load-sharing operation.
Q: Can it be used with non-Woodward engine controls?
A: Yes, provided the speed control is compatible with the required analog speed-setting input and the complete generator control system is correctly configured.
Q: Does the module require CT and PT signals?
A: Yes. The module uses generator voltage and current sensing inputs as part of its load-sharing function.
Q: What should be checked before purchasing a replacement?
A: Verify the complete model number, supply voltage, speed-control input range, PT and CT configuration, load-sharing mode, wiring arrangement, and generator control compatibility.
🔄 Other Woodward Power Generation Models
- Woodward 9907-173 – Load Sharing Module
- Woodward 9907-252 – Load Sharing Module
- Woodward 9907-838 – PWM Load Sharing Module
- Woodward 9907-175 – PWM Load Sharing Module
- Woodward 9907-028 – SPM-A Synchronizer
- Woodward 9907-029 – SPM-A Synchronizer
- Woodward 9907-018 – 2301A Speed Control
- Woodward 9907-022 – 2301A Speed Control
- Woodward 8440-1878 – DSLC-2 Digital Synchronizer and Load Control
- Woodward 8440-1877 – MSLC-2 Master Synchronizer and Load Control
🏷️ Recommended Short Title
Woodward | 9907-252 | 24VDC Load Sharing Module
