Description
The Woodward 9907-165 is a microprocessor-based 505E digital governor engineered for the precise control and protection of industrial steam turbines. This configurable, field-programmable controller is specifically optimized for extraction steam turbines, managing single-extraction, split-extraction, or admission turbine applications. It regulates turbine speed, load, and extraction/admission pressures by controlling two independent actuator outputs simultaneously.
Technical Specifications
| Parameter | Value / Detail |
| Model Number | 9907-165 |
| Product Line | 505E Digital Series |
| Input Voltage Range | 180 to 264 V AC (47 to 63 Hz) |
| Operator Interface | Integrated 2-line text LED display with 30-key tactile keypad |
| Speed Inputs | 2 Magnetic Pickup (MPU) or proximity probe inputs |
| Actuator Outputs | 2 Independent current outputs (4–20 mA or 0–200 mA configurable) |
| Analog I/O | 6 Programmable Current Outputs (4–20 mA) |
| Discrete I/O | 16 Configurable Contact Inputs, 8 Programmable Relay Outputs |
| Operating Temperature | −25 to +65 °C (−13 to +149 °F) |
| Physical Weight | Less than 10 lbs (4.5 kg) |
| Physical Dimensions | 356 mm x 279 mm x 102 mm (14.0″ x 11.0″ x 4.0″) |
| OEM Manual Reference | Product Manual 85018 |
Technical Features & Field Engineering Context
Steam Mapping and Dual-Actuator Control
The 505E platform relies on a mathematically defined “steam map” loaded into the processor firmware. The internal algorithms coordinate the positioning of the high-pressure (HP) valve and the extraction/low-pressure (LP) valve simultaneously. When a process load fluctuation requires more extraction steam without changing electrical power generation, the 9907-165 calculates the precise differential movement required for both actuators. During system tuning, the turbine’s physical limiting constants—such as maximum extraction flow and casing pressure limits—must be programmed accurately to prevent hunting or hunting-induced instabilities.
Dual Speed/Load Dynamics
The module features dual speed/load dynamics to handle both decoupled grid operation and isolated island running modes.
- Grid Connected (Droop Mode): Operates on standard PID dynamics designed to manage megawatt (MW) load demand while following system grid frequency.
- Islanded Operation (Isochronous Mode): Transitions automatically or via discrete command to highly responsive, high-gain PID dynamics to tightly regulate local bus frequency under sudden load variations.
Critical Safety and Trip Logics
The 9907-165 incorporates an independent overspeed trip protection routine that continuously calculates acceleration metrics. If the primary MPU signal registers an acceleration rate that breaches the programmed curve, the unit trips all 8 relay outputs within milliseconds to isolate the steam supply emergency trip valve.
Commercial and Logistics Status
- Condition: New Original (New Surplus) or Refurbished (tested on dedicated Woodward 505 simulator jigs).
- Warranty Period: 12-month operational protection hardware warranty from delivery date.
- Global Lead Time: Ships within 2 to 5 business days for in-stock surplus assets.
- Documentation: Verify firmware revision level and specific plant parameter files prior to installing replacement governors in operating turbomachinery loops.
Commercial Note: The Woodward 505E legacy series has seen generation replacements via the newer 505D hardware architectures. Supply levels fluctuate, and standard pricing is highly volatile. Contact our sales office for a firm, project-specific commercial quote.
Frequently Asked Questions
Can the 9907-165 drive low-impedance mechanical hydraulic actuators directly?
Yes. The actuator driver stages can be configured via physical jumpers and software settings to deliver either a low-level 4–20 mA signal for electronic I/P converters, or high-current 0–200 mA drives suitable for older Woodward EGCP or TM-type mechanical-hydraulic actuators.
What happens if one of the dual MPU speed inputs fails during turbine operation?
The 9907-165 operates an active input monitoring system. If configured for redundant speed pickups, a sudden loss of signal on one channel triggers an immediate system alarm while control shifts to the secondary channel. If both signals are lost, the governor executes an emergency emergency shutdown sequence.
How is the configuration file backed up or extracted on this generation of 505E?
Because this unit relies on a 2-line integrated LED interface, saving settings requires either manual logging of the programming block parameters or utilizing Woodward’s Watch Window or Control Assistant software suite connected via the serial communication port. Ensure you download the tunings before swapping modules.
