Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 5438-667 |
| Manufacturer | Woodward, Inc. |
| Product Type | 125 V DC/DC Power Supply Module |
| Product Series | Woodward 5400 Series control hardware |
| Input Voltage | 125 V DC nominal (station battery bus, typical tolerance 90…150 V DC) |
| Output Voltage | Regulated low-voltage DC rails for control logic and I/O (commonly 24 V DC and 5 V DC, configuration dependent) |
| Output Power | Low-power control-grade module, typically 10…100 W depending on chassis loading |
| Conversion Topology | Isolated DC/DC switching conversion with output filtering |
| Protection Functions | Overvoltage, overcurrent, short-circuit and overtemperature shutdown; independent time overcurrent protection |
| Monitoring and Diagnostics | Microprocessor supervision with watchdog function, LED status indication, analogue low-pass input filtering |
| Cooling Method | Natural convection with chassis fan-assisted airflow |
| Operating Temperature | -40 °C to +85 °C (-40 °F to +185 °F) |
| Relative Humidity | 5% to 95%, non-condensing |
| Dimensions (H x W x D) | 12.5 cm x 22 cm x 17.1 cm |
| Weight | 1.76 kg (3.88 lb) |
| Mounting | Plug-in module for Woodward control chassis / panel or DIN rail mounting with base |
| Certifications | CE, RoHS (confirm agency approvals against your system documentation) |
| Country of Origin | USA |
Main Features and Advantages
Purpose-built for 125 V DC station battery systems:
The Woodward 5438-667 is designed around the 125 V DC bus that already exists in power plants, substations, compressor stations and marine vessels because that bus is backed by a battery bank and therefore survives an AC supply failure. By converting directly from this battery-backed source, the Woodward 5438-667 keeps the control system alive through exactly the events when control matters most, and it does so without the additional conversion losses and failure points of an intermediate AC feed.
Galvanic isolation and low-noise output:
Control electronics sitting next to large generators, contactors and variable-speed drives are exposed to surges, ground loops and high-frequency noise. The Woodward 5438-667 provides isolation between its input and output stages, combined with effective analogue low-pass filtering and digital filtering of measured values, so that ripple and transients from the station battery do not reach the sensitive speed-sensing, analogue input and CPU circuits downstream. Clean power in this context is not a luxury, it is what keeps speed and load control loops from hunting.
Layered protection with real diagnostics:
Rather than simply shutting down, the Woodward 5438-667 supervises its own operation through a microprocessor with watchdog functionality and applies independent time overcurrent protection, alongside overvoltage, short-circuit and overtemperature protection. LED status indication gives a technician immediate visual confirmation of module health during a fault investigation, which shortens the difference between a five-minute diagnosis and a five-hour one during an outage.
True drop-in serviceability:
Because the Woodward 5438-667 mounts as a plug-in card and connects only through the power bus of the chassis, replacement does not disturb field wiring, I/O terminations or the control application. For maintenance teams managing ageing Woodward platforms, this form-fit-function compatibility means the spare can be installed by in-house technicians on a planned outage window, without a control system engineer on site and without re-commissioning the governor.
Application Field
The Woodward 5438-667 is most at home in turbine and large-engine control. In gas and steam turbine governor panels, it supplies the regulated logic power that lets the speed control, temperature monitoring and valve driver modules continue to function; in hydro and aero-derivative installations the same requirement applies, and the loss of the module means the loss of the governor itself. Combined-cycle plants, district heating turbine halls and industrial cogeneration units running legacy Woodward 43027 or MicroNet racks are the classic installed base for the Woodward 5438-667.
In oil, gas and pipeline service, the Woodward 5438-667 powers the control hardware governing gas compressor trains, pipeline booster units and wellhead or platform engine drives. These sites almost always distribute a 125 V DC control supply for their switchgear and protection systems, which makes the module a natural fit, and they are frequently unmanned or remotely monitored, which raises the cost of any single-point power failure. Diesel and gas engine generator sets in hospitals, data centres, mines and remote communities rely on the same architecture for their speed and load control.
Marine propulsion and offshore installations form a third important application area, where the Woodward 5438-667 feeds engine and turbine control electronics from the vessel’s DC distribution system and must tolerate salt-laden, humid and continuously vibrating environments. Utilities and substation automation projects use the module in distributed generation and load-shedding control panels, and steel, cement and chemical plants apply it wherever a Woodward governor supervises a critical prime mover. In every one of these settings, the problem the Woodward 5438-667 solves is identical: turning a raw, noisy, battery-backed 125 V DC bus into the stable, isolated, protected power that a control system can trust.
