Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Woodward 9907-186 GS10 Driver |
| Manufacturer | Woodward, Inc. (USA) |
| Product Type | Analog Load Sharing Module (GS10/GS3) |
| Power Supply | 24 VDC nominal (18–32 VDC wide range) |
| Power Consumption | ≤10 W typical |
| Speed Setting Output | ±3 VDC standard (0.5–4.5 VDC optional) |
| Load Sensing Input | Three-phase CT current signals (active power detection) |
| Load Sharing Accuracy | ≤±1% of rated power |
| Operating Temperature | -40°C to +70°C (some sources cite +85°C) |
| Dimensions (L×W×H) | 222 × 80 × 266 mm |
| Net Weight | Approximately 2.16 kg |
| Mounting | DIN rail or panel mount, cabinet installation |
| Compatible Governors | Woodward 2301A, 2301E, 723PLUS, Peak150, 505, UG hydraulic governors |
Main Features and Advantages
The Woodward 9907-186 GS10 Driver delivers a combination of precision load balancing, broad compatibility, and field-serviceable design that makes it a preferred solution for multi-generator parallel applications. Its analog architecture provides deterministic, fast-response control without the latency or configuration complexity of digital alternatives.
Dual-Mode Load Sharing for Flexible Operation: The Woodward 9907-186 GS10 Driver supports both isochronous (constant frequency) and droop (frequency declines with load) load-sharing modes, selectable via hardware configuration . In isochronous mode, the module maintains constant system frequency during isolated operation, making it ideal for prime power and islanded microgrid applications. Droop mode introduces a natural frequency decline as load increases, providing inherent stability and anti-reverse-power protection when paralleling with a utility grid. This dual-mode capability allows the same module to serve in both scenarios without hardware changes.
Cross-Brand Governor Compatibility: The Woodward 9907-186 GS10 Driver is engineered to interface with a remarkably broad range of speed governors, including Woodward’s own 2301A, 2301E, 723PLUS, Peak150, and 505 series, as well as UG hydraulic governor drive boxes with 8525-971 interfaces . The output bias signal can be hardware-configured for high-impedance, low-impedance, or PWM output modes, enabling direct connection to third-party electronic governors such as those used in Caterpillar engine control systems. This interoperability makes the Woodward 9907-186 GS10 Driver a practical solution for mixed-fleet generator installations and retrofit projects.
Field-Adjustable Hardware Configuration: All critical tuning parameters on the Woodward 9907-186 GS10 Driver are accessible through panel-mounted multi-turn potentiometers, eliminating the need for proprietary software, laptops, or communication interfaces during commissioning or troubleshooting . Technicians can adjust load gain, response damping, droop coefficient, and single-unit base load offset directly at the module. This design reduces commissioning time and enables rapid field corrections when system dynamics change due to generator overhaul, load profile shifts, or governor replacement.
Automatic Grid/Island Mode Detection: The Woodward 9907-186 GS10 Driver incorporates a discrete input that accepts a circuit breaker auxiliary contact to detect whether the generator is operating in parallel with other units or connected to a utility source . When the breaker is closed (grid-connected), the module engages load sharing logic. When open (islanded or isolated), it automatically switches to fixed droop mode to prevent load drift and instability. This automatic mode transition simplifies operator procedures and reduces the risk of manual configuration errors during mode changes.
