Woodward 8273-140 2301D Speed Control Module

Description

Key Technical Specifications

Woodward identifies 8273-140 specifically as the 2301D Load Sharing and Speed Control, 24 VDC input, Ordinary Locations version. The hazardous-location equivalent is 8273-141, so those two part numbers should not be treated as interchangeable without checking the installation requirements.

Woodward’s published specifications give an 18–40 VDC supply range and ≤20 W nominal consumption. The magnetic-pickup input is specified for 100–25,000 Hz, corresponding to the documented 300–3,600 rpm range under the specified sensing arrangement.

Product Introduction

The Woodward 8273-140 is a 2301D digital load sharing and speed control used with diesel or gaseous engine-driven generators. It provides engine speed regulation and generator load-sharing functions and was designed as a microprocessor-based successor to earlier Woodward load-sharing controls.

This is an ordinary-location, 24 VDC version. Woodward later replaced part number 8273-140 with 8273-501, adding changes including an updated PID algorithm, adaptive speed sensing, remote lock-in-last functionality, actuator-position droop, and additional Modbus functions.

8273-140

8273-140

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation

Estimated time: 20–30 minutes

1. Notify operations and place the generator set in its approved maintenance state.
2. Follow the generator manufacturer’s shutdown and LOTO procedure.
3. Isolate the 24 VDC control supply.
4. Verify the supply is actually de-energized with a properly rated multimeter.
5. Wear an ESD wrist strap when handling the controller.
6. Prepare:
   • Digital multimeter
   • PH1 screwdriver
   • Wire labels
   • Camera/phone
   • 2301D documentation
   • Existing controller configuration records
7. Photograph the complete controller and terminal wiring.
8. Record the existing 8273-140 serial number and software/hardware identification.
9. Record magnetic-pickup wiring, actuator connections, load-sharing connections, and discrete-input assignments.

⚠️ Do not start by copying PID values blindly. Woodward specifically states that PID settings are not directly correlated between the old 8273-140 software and the replacement 8273-501.

Stage 2: Removing the Old Module

Estimated time: 15–25 minutes

1. Confirm the engine cannot start unexpectedly.
2. Verify control power is isolated.
3. Label each terminal before disconnecting it.
4. Photograph the complete terminal strip.
5. Identify the magnetic pickup terminals and polarity.
6. Identify actuator output wiring.
7. Identify load-sharing and synchronization connections.
8. Disconnect wiring without pulling on individual conductors.
9. Remove the controller mounting hardware.
10. Carefully remove the 8273-140.
11. Inspect the wiring for loose terminals, corrosion, insulation damage, or incorrect shielding.
12. Retain the original controller until commissioning is complete.

⚠️ The magnetic-pickup circuit deserves special attention. A poor connection or incorrect shielding can produce unstable speed feedback that looks like a controller fault.

Stage 3: Installing the New Module

Estimated time: 20–30 minutes

1. Verify the replacement part number and revision.
2. Confirm the installation is an ordinary-location application.
3. Compare the terminal arrangement against the original unit.
4. Secure the replacement controller.
5. Reconnect the 24 VDC supply.
6. Reconnect the magnetic pickup using the documented polarity and shielding arrangement.
7. Reconnect actuator wiring.
8. Reconnect load-sharing and generator interface wiring.
9. Reconnect discrete inputs.
10. Verify all terminal assignments against the approved wiring diagram.
11. Check continuity and supply polarity before energizing.

Configuration Check — Critical

1. Record the original speed-sensing configuration.
2. Record rated speed and speed-sensing parameters.
3. Record actuator type and output settings.
4. Record load-sharing configuration.
5. Record droop/isochronous configuration.
6. Record remote-speed and baseload input settings.
7. Record applicable Modbus settings.
8. Do not transfer old PID values to a replacement 8273-501 without following Woodward’s tuning procedure.

Stage 4: Power-On & Testing

Estimated time: 45–90 minutes

1. Confirm the engine is in a safe condition for controlled testing.
2. Verify the DC supply voltage.
3. Power the controller.
4. Check controller status indications.
5. Confirm the magnetic pickup produces a valid speed signal.
6. Verify the displayed speed against an independent reference.
7. Start the engine under the approved commissioning procedure.
8. Verify stable speed control at the required operating points.
9. Check actuator response.
10. Verify load-sharing behavior with the applicable generator configuration.
11. Test discrete inputs.
12. Verify remote-speed and baseload functions if installed.
13. Verify communication functions if used.
14. Check fault indications and event records.
15. Record final tuning parameters and commissioning results.

⚠️ Do not validate a governor replacement by immediately applying full generator load. Establish correct speed sensing and actuator response first, then increase load in controlled steps.

Woodward’s documentation states that the 2301D is designed for generator prime movers and provides load-sharing and speed-control functions. The control also incorporates speed-sensing and configurable control functions intended for generator applications.

Frequently Asked Questions (FAQ)

1. What is the Woodward 8273-140?

The 8273-140 is a Woodward 2301D digital load-sharing and speed-control unit for diesel or gaseous engine-driven generators. It provides engine speed regulation and generator load-sharing functions.

2. What voltage does the 8273-140 use?

The nominal supply is 24 VDC, with Woodward specifying an 18–40 VDC operating range. Nominal power consumption is listed as no more than 20 W.

3. Is 8273-140 still manufactured?

The original 8273-140 is a legacy/discontinued part number. Woodward’s own application note lists 8273-501 as the replacement for the 8273-140.

4. Can I replace 8273-140 with 8273-501?

Woodward identifies 8273-501 as the replacement part number. However, the replacement is not simply a matter of transferring every old parameter. Woodward specifically warns that PID settings between the old and new software are not directly correlated and recommends starting the replacement unit’s relevant PID settings at their defaults before tuning.

5. What is the difference between 8273-140 and 8273-141?

Both belong to the 2301D family, but 8273-140 is for ordinary locations, while 8273-141 is the hazardous-location version. The installation environment therefore matters when selecting a replacement.

6. What speed signal does the 8273-140 use?

The 2301D specification identifies a magnetic pickup input from 100 to 25,000 Hz. The actual engine speed range depends on the number of gear teeth or timing pulses used by the particular installation.

7. Is the 8273-140 suitable as a direct replacement for 2301A controls?

The 2301D was designed to include functions of and be compatible with 2301A load-sharing controls, making it suitable for certain upgrade applications. However, actual replacement work requires checking the actuator, speed pickup, generator/load-sharing wiring, control configuration, and application-specific tuning.