Description
⚙️ Product Overview
The WOODWARD 2301D 8273-140 is a digital Load Sharing and Speed Control unit designed for generators driven by diesel or gaseous engines. It provides electronic speed regulation, generator load sharing, and operating-load control for engine-driven generator systems.
The 2301D is a microprocessor-based controller designed to provide functions associated with Woodward 2301A load-sharing controls while adding software-based control flexibility. It can operate in isochronous, droop, or base-load modes depending on the application and system configuration.
Part number 8273-140 identifies the 2301D version with a 24 VDC input for ordinary locations. Woodward documentation also identifies 8273-140 as an earlier 2301D part number, with 8273-501 subsequently introduced as its replacement part number.
🔧 Main Features
- ⚡ 24 VDC control power input
- ⚙️ Digital engine speed control
- 🔄 Generator load-sharing capability
- 📈 Isochronous, droop, and base-load operating modes
- 🔌 External speed/load reference inputs
- 🧠 Microprocessor-based control architecture
- 💻 Configuration through an external computer
- 🔗 Front 9-pin serial interface for configuration
- 🎛️ PID-based speed-control functions
- ⚙️ Suitable for diesel and gaseous engine-driven generators
- 🏭 Ordinary-location version
- 🔄 Soft load transfer capability for generator paralleling applications
📋 Datasheet
| Parameter | Value |
|---|---|
| Brand | WOODWARD |
| Model | 2301D |
| Part Number | 8273-140 |
| Series | 2301D Digital Load Sharing and Speed Controls |
| Product Name | Load Sharing and Speed Control Unit |
| Control Type | Microprocessor-Based Digital Control |
| Input Power | 24 VDC nominal |
| Operating Supply Range | 18–40 VDC |
| Installation Classification | Ordinary Locations |
| Application | Diesel / Gas Engine Generator Control |
🎛️ Control Functions
The 2301D can provide several operating modes according to the generator-system design.
Isochronous Control
Isochronous operation maintains the prime mover at the selected speed and can be used for single-generator operation or multiple generators operating with compatible load-sharing controls on an isolated bus.
Droop Control
Droop mode provides speed control as a function of generator load and can be used for generator operation against an infinite bus or for parallel operation of multiple prime movers.
Base-Load Control
Base-load operation maintains a selected generator load level against a bus. The load reference can be established through fixed, analog, or external contact control depending on the system configuration.
🔌 System Integration
The 2301D is intended to operate as part of an engine-generator control system rather than as a standalone PLC.
Typical connections can include:
- Magnetic pickup speed sensing
- Engine actuator
- Load-sharing lines
- Generator load reference
- Remote speed reference
- Start/stop or discrete control signals
- Generator and bus control signals
- External PC configuration interface
The controller uses a front-mounted 9-pin connector for connection to an external computer during setup and configuration.
🏭 Typical Applications
The Woodward 2301D is suitable for engine-driven generator applications such as:
- Diesel generator sets
- Gas-engine generator sets
- Standby power generation
- Prime-power generator systems
- Parallel generator installations
- Utility-parallel generation
- Marine generator systems
- Industrial power-generation equipment
- Engine-generator retrofit projects
🛠️ Installation Considerations
Before replacing an existing controller, verify the complete part number and system configuration.
- Confirm 8273-140 on the controller nameplate.
- Verify the 24 VDC control-power supply.
- Confirm that the installation is an ordinary-location application.
- Check the magnetic pickup or speed-sensing arrangement.
- Verify actuator compatibility and wiring.
- Check load-sharing connections.
- Record existing speed-control and load-reference settings.
- Verify discrete-input and analog-reference wiring.
- Connect the configuration computer using the appropriate interface.
- Perform engine speed, load-sharing, and protective-function tests after commissioning.
⚠️ Generator speed and load controls are safety-critical equipment. Installation, tuning, and commissioning should be performed by qualified personnel familiar with the engine, actuator, generator, and protection system.
🔍 Maintenance & Troubleshooting
Engine Speed Is Unstable
Check the speed sensor signal, actuator response, wiring, grounding, and controller tuning. Incorrect gain, reset, or actuator compensation settings can affect speed stability.
Generator Does Not Share Load Correctly
Check the load-sharing connections, CT/load signal, generator operating mode, wiring, and controller settings. Confirm that all parallel generator controllers use compatible load-sharing arrangements.
Controller Does Not Power Up
Verify the DC supply, polarity, wiring, fuses, terminal connections, and supply voltage at the controller.
Speed Signal Is Missing
Inspect the magnetic pickup, pickup wiring, connector terminals, and signal frequency. A weak or unstable speed signal can prevent correct speed regulation.
Replacement Controller Requires Retuning
The 8273-140 is an earlier 2301D part number. When upgrading to a later replacement such as 8273-501, Woodward advises that PID-related settings should not simply be copied from the old controller; tuning should begin from the replacement controller’s appropriate default values.
❓ Common Questions & Answers
Q1: What is the WOODWARD 2301D 8273-140?
It is a digital load-sharing and speed-control unit for diesel- or gas-engine-driven generators.
Q2: What is the input voltage?
The 8273-140 is specified for a 24 VDC input, with an operating supply range of approximately 18–40 VDC.
Q3: Is 8273-140 for hazardous locations?
No. 8273-140 is the ordinary-location version. Woodward identifies 8273-141 as the corresponding hazardous-location 2301D version.
Q4: Can the 2301D control generator speed?
Yes. Speed control is one of its primary functions.
Q5: Can it perform generator load sharing?
Yes. The 2301D is specifically designed for load-sharing applications involving compatible generator-control systems.
Q6: What operating modes are available?
The 2301D supports isochronous, droop, and base-load operating modes depending on the application and configuration.
Q7: How is the controller configured?
Configuration is performed through an external computer connected to the controller’s front serial interface.
Q8: Is 8273-140 still a current Woodward part number?
It is an earlier 2301D part number. Woodward’s part-number comparison identifies 8273-501 as the replacement for 8273-140.
Q9: Can 8273-140 be directly replaced by 8273-501 without checking settings?
The two belong to the same 2301D family, but Woodward specifically notes differences in PID behavior and recommends beginning tuning with the replacement unit’s default Gain, Reset, and Actuator Compensation values rather than copying old settings directly.
Q10: What should be checked before ordering a replacement?
Confirm the part number, input voltage, ordinary/hazardous-location classification, engine type, actuator, speed sensor, load-sharing arrangement, and existing control configuration.
🔄 10 Related WOODWARD Models
- 2301D 8273-140 — Load Sharing and Speed Control
- 2301D 8273-141 — Hazardous-Location Load Sharing and Speed Control
- 2301D 8273-501 — Replacement 2301D Load Sharing and Speed Control
- 2301D 8273-503 — Hazardous-Location Replacement Control
- 2301D-EC 8273-138 — Load Sharing and Speed Control with Modbus
- 2301D-EC 8273-139 — Hazardous-Location 2301D-EC
- 2301D-EC 8273-505 — Replacement 2301D-EC Control
- 2301D-EC 8273-507 — Hazardous-Location Replacement 2301D-EC
- 2301A Series — Analog Load Sharing and Speed Controls
- Woodward 701 Series — Digital Engine Speed Controls
📦 Spare-Part Note
The WOODWARD 2301D 8273-140 is an important legacy controller for engine-driven generator speed and load-sharing applications. When sourcing a replacement, match the complete part number and application rather than selecting a controller solely by the “2301D” family name. For modernization projects, the 8273-501 replacement should also be evaluated with the existing engine, actuator, speed sensor, and load-sharing system.
