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The 8280-423 model is a Dual Engine Marine Low Voltage Load Sharing Model produced by Woodward as part of the 723PLUS Digital Control Standard Applications. This model is often used to control and manage reciprocating engines used in marine propulsion.



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  • Part Number: 8280-423
  • SKU: 8280423WO
  • Manufacturer: Woodward
  • Series: 723 and 723PLUS Digital Control

8280-423 Technical Specifications

Part Number 8280-423
Manufacturer Woodward
Manual 02881
Weight 6lbs 8oz (2.95kg)
Dimensions (cm)W41.28 x L29.21 x H6.04 | (in)16.25W x 11.5L x 2.375H
Operating Temperature -40 to +70 °C (-40 to +158 °F)
Chassis Metal
Standards UL/cUL Listing Class 1, Division 2, Groups A, B, C, D
Input Voltage 90–150 Vdc (125 Vdc nominal)

Product Description

8280-423 is a 723PLUS Digital Marine Speed Control. It is one of two such controls released by Woodward in the company’s 723PLUS series. This model is the version designed for medium- and high-speed engines (over 100 rpm). The 8280-423 is a low-voltage 723PLUS control rated for 18-40 Vdc. A low-voltage model such as this requires 40 W and has a switching power supply, which requires a 7 A current surge for proper starting.

The 723PLUS model 8280-423 is intended for dual-engine marine applications where mechanical load sharing is required. It can regulate the load and speed of diesel engines used in such applications, including those with flexible couplings. Magnetic pickups (MPUs) or proximity switches may be used for sensing engine speed via the control’s two-speed signal inputs.

There are many features included in the 8280-423, such features include a single-throttle operation, flexible coupling torsional filtering, and several features for fuel limiting. Woodward 723PLUS Manual 02881 has complete details on all the 8280-423 available features.

This speed control has several types of I/Os, some of which are configurable. Two alarm relay outputs are user-configurable, with thirteen status choices from which to choose, and a communication port supports a handheld programmer for monitoring and programming the control. Two more communication ports offer redundant communication for proper loading and clutching.

Frequently Asked Questions about 8280-423

Are there any communications available on the 8280-423 model? If so, what are the available communications?

When it comes to communication types, two serial interfaces are required when used with RS-232, RS-485, or RS-422 communications. Not only does the 8280-423 use these communications, but it uses the local operating network, also known as LON, a protocol for digital communications. The Input/Output (I/O) ports on this model have the ability to be expanded; when they are expanded it will be done through LinkNet nodes. LinkNet nodes can include discrete, analog, Resistance Thermal Detection (RTD), and thermocouple type I/Os.

Can the 8280-423 model perform any diagnostics; if so, how?

Yes, the 8280-423 model, as well as the other 723PLUS Woodward models, can perform diagnostic testing and are considered self-diagnostic testing. The diagnostics are used to determine the control integrity; some examples of diagnostic testing/monitoring on this model include processor, baseline power supply, and memory monitoring. 

Is this model pre-programmed, or can it be custom programmed?

This model can be custom programmed to the user's liking, but in some cases, it is easier to have the model pre-programmed. Pre-programming is available in marine, gas engine, and power generation models. 

Reviews For 8280-423

Internal Review

While the 8280-423 unit is a fantastic variation of low-voltage controllers for dual-engine marine load-sharing operations, it is difficult for us to provide an outright replacement due to its limited market availability. The best options when it comes to needing another model are repair services or installing different hardware. - AX Control Tech

Repair Services For 8280-423

Type Lead Time Price Action
Repair Service 1-2 weeks $1770

Our highly skilled technicians can repair your 8280-423. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
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