Description
Application Scenarios
In an isolated grid power supply system comprising three diesel generator sets, load variations are severe—the startup and shutdown of large motors can cause significant fluctuations in frequency and voltage. If load distribution is uneven, some units may operate under overload while others run underloaded. This not only reduces fuel efficiency but also accelerates equipment wear.
The Woodward 5500-577 is engineered precisely to solve this pain point. The module continuously monitors the load status of each generator and exchanges data in real time through the MicroNet high-speed communication backbone. When the load on one generator rises, the 5500-577 automatically adjusts the output of other units, ensuring all online generators share the load proportionally. When a unit goes offline due to a fault, the 5500-577’s built-in monitoring function detects a “missing member” on the CAN load share bus and automatically switches the system to droop mode, preventing the remaining units from tripping due to overload .
In another industrial scenario, the 5500-577’s 28-channel SPDT relay outputs are used to control alarm circuits and trip logic for generator sets. Its 1500V AC coil-to-contact isolation ensures an electrical safety barrier between control logic circuits and high-power field devices .
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 5500-577 |
| Manufacturer | Woodward |
| Product Category | Load Share Module / Relay Output Module |
| Country of Origin | USA |
| Rack Supply | 24 V DC |
| Module Consumption | 0.3 A @ 24 V |
| Relay Outputs | 28 × SPDT (Single-Pole Double-Throw) |
| Isolation | 1500 V AC (coil-to-contact) |
| Operating Temperature | –20°C to +70°C |
| Storage Temperature | –40°C to +85°C |
| Humidity | 5–95% RH non-condensing |
| Weight | Approx. 0.95 kg |
Technical Principles and Innovative Values
High-Speed Load Sharing Communication: The 5500-577 operates as a transceiver interface module within the MicroNet load sharing architecture, enabling deterministic data exchange between multiple control nodes. Its high-speed transceiver circuitry minimizes communication latency, allowing rapid system response to sudden load changes .
Integrated Monitoring and Automatic Degradation: The module incorporates multiple monitoring functions. When it detects a missing member on the load share bus, abnormal GCB feedback, or abnormal tie-breaker status, the 5500-577 automatically switches the system to droop mode, ensuring generators continue running rather than tripping .
Optical Isolation Protection: The 5500-577 employs optical isolation architecture, providing electrical isolation between the control backplane and field communication lines. This design effectively resists electromagnetic interference and transient voltages, protecting the main processor from field noise .
Redundant System Compatibility: The module fully supports redundant MicroNet configurations, maintaining synchronized communication between primary and backup controllers. This ensures that load sharing logic continues seamlessly during primary/backup switchover .
