Description
Woodward 9907-167 | 505E Digital Governor | Steam Turbine Control
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Model | 9907-167 |
| Product Family | 505E Digital Governor |
| Application | Steam turbine extraction/admission control |
| Power Input | 18–32 VDC |
| Actuator Outputs | 2 |
| Relay Outputs | 8 |
| Programmable Current Outputs | 6 |
| Operator Interface | 30-key keypad |
| Display | 2 rows × 12 characters |
| Programming | Field configurable through the 505E interface |
| Program Transfer | Upload/download capability |
| Mounting | Panel mount |
| Optional Enclosure | 8923-439 NEMA 4X bulkhead mounting box |
| Hazardous Area | Class I, Division 2 / Zone 2 applications when appropriately certified |
| Operating Temperature | Approximately -13 to +149°F (-25 to +65°C), depending on enclosure/configuration |
| Low-Voltage Variant | 18–32 VDC |
Woodward’s 505E manual identifies 9907-167 specifically as the LVDC version of the 505E, while 9907-165 uses 180–264 VAC and 9907-166 accepts 88–132 VAC or 90–150 VDC. This distinction is critical when replacing an installed governor.
Product Introduction
The Woodward 9907-167 is a 505E Digital Governor designed for steam turbines with controlled extraction and/or admission pressure requirements. It is a complete turbine control unit rather than a conventional PLC I/O card, providing the control interface required for turbine speed regulation, actuator positioning, and extraction/admission control.
The 9907-167 is the 18–32 VDC power version of the 505E family. The controller provides two actuator outputs, eight relay outputs, six programmable current outputs, and a built-in keypad/display for configuration and operating functions.
9907-167
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
When a 9907-167 fails, replacing it with another 505-series unit that looks similar is not enough. The power-input variant, programmed turbine application, actuator configuration, I/O assignments, and control parameters all need to match the existing installation.
Typical Applications
- Industrial steam turbine speed control
- Extraction steam turbine control
- Admission pressure control
- Turbogenerator and mechanical-drive turbine applications
- Legacy turbine control cabinets requiring a 505E digital governor
Woodward specifically identifies the 505E as a controller for steam turbines with controlled extraction and/or admission pressure control.
Technical Pitfalls to Avoid
- Verify the power-input variant before ordering.
9907-167 is the 18–32 VDC version. It is not interchangeable on a power-input basis with 9907-165 or 9907-166. - Do not treat the 9907-167 as a generic PLC controller.
Its hardware and software are designed around Woodward 505E turbine-governor functions. The existing application configuration, actuator type, speed sensing, extraction/admission scheme, and I/O assignments matter during replacement. - Check hazardous-area certification on the actual nameplate.
Woodward documentation identifies the 505E family for Class I, Division 2 / Zone 2 environments, but the applicable certification is limited to units carrying the required certification identification. Field wiring and connected equipment must also meet the installation requirements.
Related Products
- Woodward 9907-165 — 505E high-voltage AC version, using 180–264 VAC input.
- Woodward 9907-166 — 505E AC/DC version for 88–132 VAC or 90–150 VDC.
- Woodward 505E — Digital governor family for extraction and/or admission steam turbines.
- Woodward 505 — Related digital governor family intended for steam turbines without the 505E extraction/admission control configuration.
- Woodward 9907-164 — 505-series 18–32 VDC controller variant; application and control functions differ from the 505E and should not be assumed interchangeable.
- Woodward 8923-439 — Optional NEMA 4X bulkhead mounting box specified for the 505E.
Procurement Check
Before approving a Woodward 9907-167 replacement, verify:
- Exact part number: 9907-167
- 505E controller family
- 18–32 VDC power requirement
- Hardware revision letter
- Certification/nameplate markings
- Existing turbine application configuration
- Number and type of connected actuators
- Speed-sensing arrangement
- Extraction/admission control configuration
- Relay and analog-current output assignments
- Existing control parameters and programmed settings
- Panel mounting arrangement
- NEMA 4X enclosure requirement, if applicable
- Existing turbine shutdown/interlock architecture
Recommended procurement description:
Woodward 9907-167 505E Digital Governor, Low-Voltage DC 18–32 VDC, Steam Turbine Extraction/Admission Control, Dual Actuator Outputs, 8 Relay Outputs, 6 Programmable Current Outputs.
The key replacement issue is the power variant plus the turbine application configuration. A 9907-167 is not simply a generic 24 VDC Woodward controller; it is the LVDC version of the 505E Digital Governor, and the installed turbine’s programmed control scheme must be considered before substitution.
