WOODWARD 5500 Series Modules | 5500-577 Load Share Module

Technical Dossier

Product Details And Specifications

WOODWARD 5500 Series: Comprehensive Module Range and Technical Overview

The WOODWARD 5500 Series represents one of the most widely deployed governor and load-sharing control platforms in global heavy industry. Installed across natural gas compressor stations, combined-cycle power plants, offshore platforms, petrochemical refineries, and nuclear auxiliary systems, the 5500 Series established WOODWARD's position as the reference standard for turbine and engine control in critical-process environments. Its modular backplane architecture allows plant engineers to configure control density precisely to application requirements, from single-engine genset synchronization to multi-unit load-sharing networks spanning entire power islands. The 5500-577 Load Share Module is a core component of this ecosystem, providing analog load-sharing signal conditioning and inter-unit communication for parallel generator sets.

The Evolution of 5500 Series Architecture

The 5500 Series was introduced as a successor to WOODWARD's earlier EG and UG governor families, transitioning from purely mechanical and analog-electronic governors to a fully modular, rack-mounted digital-analog hybrid control platform. Early 5500 configurations relied on discrete analog signal buses for load sharing and speed referencing, with inter-module communication handled via hardwired backplane traces. As industrial control standards evolved through the 1990s and 2000s, WOODWARD progressively introduced enhanced communication-capable variants, adding RS-232 and RS-485 serial interfaces to select modules, enabling integration with SCADA and DCS layers without replacing the core control hardware.

Compatibility across 5500 generations is constrained by backplane slot assignments and power rail specifications. Early-generation analog I/O modules (e.g., 5500-570, 5500-571) are not directly interchangeable with later digital-interface variants without verifying backplane revision levels. Plants operating mixed-generation 5500 racks must validate firmware compatibility matrices before substituting modules. As of 2026, the 5500 Series has entered the mature/end-of-life phase of its product lifecycle. WOODWARD has transitioned new installations to the MicroNet and 505 Digital Governor platforms. However, the installed base of 5500 Series hardware in long-lifecycle facilities (refineries, nuclear auxiliary systems, offshore platforms) remains substantial, and long-term maintenance support for this series is a primary operational requirement for asset integrity teams.

5500 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced components within the WOODWARD 5500 Series. Each module is classified by functional category.

Load Sharing & Synchronizing Modules

• 5500-577: Load Share Module — analog load-sharing signal conditioning for parallel generator sets.
• 5500-570: Load Sharing & Speed Control Module — combined speed reference and load division for multi-unit systems.
• 5500-571: Load Sharing Module (enhanced) — improved droop compensation for large parallel bus configurations.
• 5500-572: Synchronizer Module — automatic synchronizing for generator tie-in to live bus.
• 5500-573: Sync-Check Module — permissive relay output for breaker close authorization.

Speed Control & Governor Modules

• 5500-574: Speed Control Module — isochronous and droop speed governing for gas and diesel engines.
• 5500-575: Actuator Driver Module — 4–20 mA and PWM actuator output conditioning for fuel control valves.
• 5500-576: Overspeed Detection Module — hardwired overspeed trip with independent MPU input channel.
• 5500-578: Speed Reference Module — remote speed setpoint input via analog signal or contact closure.
• 5500-579: Idle/Rated Control Module — two-state speed scheduling for engine warm-up and rated-load transitions.

I/O & Signal Conditioning Modules

• 5500-580: Analog Input Module — 4-channel 4–20 mA process variable input for temperature and pressure monitoring.
• 5500-581: Analog Output Module — 4-channel isolated 4–20 mA output for remote indication and DCS interface.
• 5500-582: Digital Input Module — 16-channel 24 VDC discrete input for contact status monitoring.
• 5500-583: Digital Output Module — 16-channel relay output for alarm annunciation and permissive control.
• 5500-584: MPU Input Module — magnetic pickup signal conditioning, dual-channel, for speed sensing redundancy.

Power Supply & Chassis

• 5500-585: Power Supply Module — 24 VDC regulated backplane power, 10 A continuous, with redundancy input.
• 5500-586: Chassis / Rack Assembly — 19-inch rack-mount enclosure, 12-slot backplane, for full 5500 system builds.
• 5500-587: Communication Interface Module — RS-485 Modbus RTU gateway for DCS/SCADA integration.

Sourcing Hard-to-Find & Obsolete 5500 Series Parts

With the 5500 Series in end-of-life status, OEM factory supply for many modules — including the 5500-577 — has been discontinued or is subject to extended lead times exceeding 26 weeks. DriveKNMS maintains a dedicated inventory of tested surplus and refurbished 5500 Series modules sourced from decommissioned plant assets, controlled-environment warehouses, and authorized liquidation channels.

For facilities operating under long-term service agreements or regulatory maintenance schedules that prohibit platform migration, DriveKNMS provides lifecycle extension support including: verified-functional surplus stock, module-level repair and recalibration, cross-reference matching for superseded part numbers, and documentation packages for maintenance records. Procurement teams managing critical-path spares for 5500 Series installations are advised to establish buffer stock positions given the declining availability of new-old-stock units in the secondary market.

Quality Control for the 5500 Series Range

The WOODWARD 5500 Series employs a passive backplane bus architecture in which all inter-module communication occurs via direct backplane trace connections. This design requires that quality verification procedures address both the module's internal circuitry and its backplane connector integrity. DriveKNMS applies the following test protocol to all 5500 Series modules prior to shipment:

• Visual inspection of backplane edge connectors for pin deformation, oxidation, and solder joint integrity.
• Powered bench test at rated 24 VDC supply voltage, verifying all I/O channels against published specification tolerances.
• For load-sharing modules (including 5500-577): analog signal loop test at 4 mA, 12 mA, and 20 mA reference points, with output deviation recorded against factory calibration data.
• Insulation resistance test between signal commons and chassis ground, minimum 10 MΩ at 500 VDC.
• Functional communication test for modules with serial interface options, verifying Modbus register map response.
• Final burn-in at operating temperature for 4 hours prior to packaging.

All tested units are shipped with a DriveKNMS inspection certificate and a 12-month functional warranty covering defects in materials and workmanship under normal operating conditions.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.