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Woodward 9907-164 – 505 Digital Steam Turbine Governor
Product Overview
The Woodward 9907-164 is a 505 Digital Governor designed for steam-turbine control applications. Woodward identifies this specific version as the LVDC configuration, using an 18–32 VDC power input. The controller provides microprocessor-based turbine governing functions for applications with single or split-range actuators and can manage speed, load, valve-position, and related turbine-control functions. It includes an integrated operator interface with a two-line, 24-character display and multifunction keypad. The controller also provides 16 contact inputs, including four dedicated and twelve programmable inputs, plus six programmable 4–20 mA current inputs. RS-232/RS-422 interfaces support Modbus communication. Woodward lists this model as part of the earlier 505 generation, so it is primarily relevant to maintaining installed legacy turbine systems.
Technical Specifications — 9907-164
| Parameter | Value |
|---|---|
| Product Model | 9907-164 |
| Manufacturer | Woodward |
| Product Type | 505 Digital Governor |
| Application | Steam turbine control |
| Power Supply | 18–32 VDC |
| Nominal Power Input | 24 VDC, approximately 1 A |
| Contact Inputs | 16 total |
| Programmable Current Inputs | 6 × 4–20 mA |
| Communication | RS-232 / RS-422 |
| Protocol | Modbus |
| Display | 2 lines × 24 characters |
| Keypad | 30-function multifunction keypad |
| Enclosure Protection | IP56 |
| Mounting | Front-panel mounting |
| Operating Temperature | -20 to +60°C approximately |
| Dimensions (H × W × D) | Approx. 11 × 14 × 4 in. |
| Weight | Approx. 9.11 lb / 4.13 kg |
Woodward’s official manual confirms that 9907-164 is the 18–32 VDC version of the 505 controller.
Woodward 9907-164
Key Features and Benefits — 9907-164
- Designed specifically for steam-turbine governor applications.
- 18–32 VDC supply suits industrial DC control systems.
- 16 contact inputs support turbine status and shutdown logic.
- Six programmable 4–20 mA inputs support process and control signals.
- Integrated keypad and display allow local configuration and operation.
- RS-232/RS-422 communication with Modbus support.
- IP56 enclosure helps protect the controller in suitable industrial installations.
- Supports functions such as critical-speed avoidance, valve limiting, automatic start sequences, and shutdown first-out indication.
Related Models
Woodward 9907-162 — 505 Digital Governor version using 180–264 VAC power.
Woodward 9907-163 — AC/DC version supporting 88–132 VAC or 90–150 VDC input.
Woodward 8200-1300 — 505D-generation upgrade reference intended for newer turbine-control applications; migration suitability must be evaluated at system level.
Woodward 505E — Related digital governor family developed for extraction steam turbine applications.
Installation and Maintenance — 9907-164
Before replacement, isolate the 24 VDC control supply and follow the turbine manufacturer’s electrical and overspeed protection procedures. Record the governor configuration, actuator settings, I/O assignments, speed-sensing arrangement, and Modbus parameters before removing the existing controller.
Verify all discrete and analog signals after installation, followed by controlled testing of startup, valve limiting, shutdown, and overspeed-protection functions. Personally, I would preserve the original configuration data before replacing this controller; a correct hardware number alone does not guarantee a ready-to-run turbine governor.
Product Warranty — 9907-164
Warranty terms depend on supplier, condition, testing status, and purchase agreement. Woodward identifies the 9907-164 as an earlier-generation 505 controller that is not intended for new plant installations, making verified surplus or refurbished inventory relevant for legacy systems. The Woodward 9907-164 should be matched to the turbine actuator configuration, I/O requirements, power source, and governor software before commissioning.
