WOODWARD 5438-667 Retrofit-Ready DC/DC Power Supply for 5438 Series

WOODWARD 5438-667 Retrofit-Ready DC/DC Power Supply for 5438 Series Control Systems

The WOODWARD 5438-667 is a DC/DC power supply module engineered for seamless integration into WOODWARD 5438 Series control systems. As legacy turbine and engine control platforms reach end-of-life, the 5438-667 has become a critical retrofit component for facilities managing aging infrastructure. Whether you are replacing a failed unit, upgrading a control cabinet, or migrating from a discontinued platform, the 5438-667 delivers the electrical compatibility and mechanical form factor required for a smooth, low-risk transition.

This module is designed to supply stable, regulated DC power to the logic and I/O subsystems within the 5438 Series backplane architecture. Its input/output voltage characteristics, connector pinout, and DIN-rail or rack-mount profile are fully consistent with original WOODWARD specifications, making it a direct drop-in replacement for worn or obsolete units without requiring panel rewiring or software reconfiguration.

Upgrade Compatibility Table

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Retrofitting a WOODWARD 5438 Series control system requires careful coordination across multiple hardware layers. The 5438-667 power supply module sits at the foundation of this architecture, providing regulated DC voltage to the entire backplane. Before installation, engineers should audit the total power budget of the control cabinet — accounting for all installed modules including the 5438-660 CPU module, any 5438-680 analog input modules, 5438-685 digital output modules, and 5438-690 communication interface cards. Each module draws a defined current from the backplane bus, and the 5438-667 must be confirmed capable of supplying the aggregate load without derating.

Terminal wiring compatibility is a key checkpoint. The 5438-667 uses the same terminal block layout as its predecessor, but field wiring should be inspected for insulation condition, correct torque on terminal screws, and absence of ground loops — particularly in older installations where the original wiring may date back 15 or more years. If the control cabinet also houses a WOODWARD 5009 or 5009A digital control unit, verify that the shared DC bus voltage remains within tolerance under combined load conditions.

For systems that include a WOODWARD NetCon 5000 or similar supervisory controller communicating over RS-485 or CAN bus, the power supply replacement does not affect protocol configuration. However, it is good practice to document the current communication link parameters — baud rate, node address, termination resistor status — before any power interruption, as some older HMI panels may lose their configuration on unexpected power loss. If the site uses a Modbus RTU link to a SCADA system or a third-party DCS, confirm that the communication module retains its settings after the power cycle introduced by the module swap.

I/O expansion cards installed in adjacent backplane slots — such as thermocouple input modules or speed sensor interface cards — should be logged with their current channel assignments and engineering unit scaling before the retrofit. This documentation protects against configuration loss and accelerates recommissioning. If the system includes a programming cable connection (typically a WOODWARD service tool cable or a standard RS-232 to RJ45 adapter), have it ready for post-installation verification using WOODWARD’s Watch Window or equivalent configuration software.

Downtime Control During System Migration

Minimizing unplanned downtime is the primary operational concern when replacing a power supply module in a live control system. The recommended approach is to schedule the swap during a planned maintenance window, with a pre-staged 5438-667 unit that has been bench-tested for correct output voltage and current capacity before it reaches the field.

Prior to de-energizing the panel, capture a full backup of the controller program using the appropriate WOODWARD configuration tool. For 5438 Series systems, this typically involves connecting via the front-panel service port and exporting the current parameter set and control logic to a laptop. This backup protects against data loss in the event that the CPU module — such as the 5438-660 — loses its volatile memory during the power interruption.

Once the 5438-667 is installed and the panel is re-energized, perform a staged power-on sequence: verify the power supply output voltage at the backplane test points before allowing downstream modules to initialize. Check that all I/O modules report healthy status on the HMI or operator panel. If the system uses a WOODWARD 2301 load sharing module or a speed control interface, confirm that setpoints and droop settings are intact before returning the unit to automatic control. The entire swap, from de-energization to return-to-service, can typically be completed within 60 to 90 minutes when the replacement module is pre-tested and all documentation is prepared in advance.

For critical applications where even a brief outage is unacceptable, consider maintaining a hot-standby spare 5438-667 in the control room. Our stock is available for same-day dispatch, supporting emergency replacement scenarios with minimal lead time.

Retrofit Support FAQ

Q1: Is the 5438-667 a direct replacement for the original WOODWARD unit, or does it require any wiring modifications?
The 5438-667 is designed as a direct drop-in replacement for the original WOODWARD 5438-667 power supply module. The terminal pinout, backplane connector, and mechanical dimensions are consistent with the original specification. No panel rewiring is required for a like-for-like swap. However, we recommend verifying the input voltage range and output load capacity against your specific installation before energizing.

Q2: How do I verify compatibility with my existing 5438 Series backplane and installed modules?
Compatibility is confirmed by matching the backplane slot type, input DC voltage range, and aggregate output current demand of all installed modules. Review the power budget of your 5438 Series chassis — including CPU, I/O, and communication modules — and confirm the 5438-667 output rating meets or exceeds the total load. If you have the original system documentation, the power budget table in the WOODWARD 5438 Series hardware manual provides the per-module current draw figures.

Q3: What commissioning steps are required after installing the 5438-667?
After installation, measure the output voltage at the backplane test points before allowing downstream modules to power up. Once voltage is confirmed within specification, restore power to the full backplane and verify that all modules — including I/O cards, communication interfaces, and the CPU — initialize correctly. Reconnect any HMI or SCADA links and confirm that communication is restored. Finally, run a functional test of all control outputs before returning the system to automatic operation.

Q4: What does the 12-month warranty cover, and what is the process for a warranty claim?
The 12-month warranty covers manufacturing defects and functional failure under normal operating conditions from the date of shipment. It does not cover damage resulting from incorrect installation, overvoltage, or physical mishandling. To initiate a warranty claim, contact our sales team with the order reference, a description of the fault, and photographic evidence of the installation. We will arrange return shipping and either repair or replace the unit at no charge within the warranty period.

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