Description
The Woodward 505E (P/N 9907-166) is a specialized microprocessor-based governor designed for single automatic extraction and/or admission steam turbines. It manages both speed/load control and extraction pressure decoupling simultaneously using dual actuator outputs.
⚙️ Product Specifications (Datasheet)
| Parameter | Value |
| Part Number | 9907-166 (505E Series) |
| Device Type | Microprocessor Control for Extraction/Admission Steam Turbines |
| Input Power Supply | High Voltage Option (88–132 VAC, 47–63 Hz or 90–150 VDC @ 50 W) |
| Enclosure Dimensions | 14.0″ W x 11.0″ H x 4.0″ D (356 mm x 279 mm x 102 mm) |
| Weight | Approx. 9.1 lbs (4.1 kg) |
| Country of Origin | USA (Woodward, Inc.) |
| Operator Interface | Integrated 2×24 Character Sealed Membrane Keypad HMI |
| Discrete Inputs / Relay Outputs | 16 Contact Inputs (4 Fixed, 12 Programmable) / 8 Relay Outputs |
| Analog Inputs / Analog Outputs | 6 Programmable 4–20 mA Inputs / 6 Programmable 4–20 mA Outputs |
| Actuator Drivers | 2 Outputs (HP Valve & Extraction/Admission Valve, 4–20 mA or 20–160 mA) |
🚀 Standard Operating Procedure
- Pre-Start Checks: Inspect field wiring, verify high-voltage power supply (88–132 VAC / 90–150 VDC), and check emergency trip circuit status.
- Power-On Diagnostics: Apply power to the unit. Ensure the front LCD completes boot self-tests without critical system alarms.
- Control Mode Selection: Choose Local OCP or Remote control mode via the front panel keys or remote plant discrete signals.
- Turbine Warm-Up & Spin: Press RUN/START to initiate speed-ramping routines (following cold, warm, or hot start profiles) up to minimum governing speed.
- Extraction Enabling: Once the turbine reaches rated speed and minimum electrical/mechanical load conditions are met, enable extraction control via the operator panel to engage extraction pressure regulation.
- Process Monitoring: Track turbine speed (RPM), high-pressure valve position %, extraction header pressure, and generator load continuously.
- Safe System Shutdown: Disables extraction mode first to stabilize speed, then initiate the STOP command to ramp down turbine speed and close steam inlet valves safely.
⚙️ Parameter Configuration Guide
- Press the PRGM key on the front control panel to switch from RUN mode to PROGRAM mode.
- Key in the security pass code (Level 1 or Level 2) using the numeric keypad and confirm with ENTER.
- Scroll through configuration blocks including Speed/Load Curves, Extraction/Admission Limits, Decoupling Ratios, and Transducer Calibration.
- Select the targeted parameter value, input updated numeric values or logic flags, and press ENTER to validate.
- Exit programming mode and select “Save Configuration” to commit changes to non-volatile EEPROM memory.
🔄 Manual / Automatic Mode Switching
- To Select Manual Mode: Press the MANUAL key on the front keypad. This allows operators to directly adjust speed setpoints, extraction pressure setpoints, and valve limiters locally.
- To Select Auto Mode: Press the AUTO key on the panel. The controller switches control logic over to internal automatic PID routines or external 4–20 mA / Modbus RS-485 remote commands from the plant DCS/SCADA system.
❓ Frequently Asked Questions (Q&A)
- Q: What is the main difference between the Woodward 505 and 505E models?
A: The standard 505 controls simple condensing or non-condensing steam turbines with single-valve control. The 505E includes built-in extraction/admission control ratio algorithms to automatically balance speed and extraction header pressure across two separate steam control valves without loop interference.
- Q: What power options exist for part number 9907-166?
A: Part number 9907-166 features the High Voltage power supply option, operating on either 88–132 VAC (47–63 Hz) or 90–150 VDC.
- Q: How does the 505E handle sudden electrical load drops while in extraction mode?
A: The controller automatically reduces extraction flow to maintain speed control and prevent overspeed, smoothly priority-shifting from pressure control to speed/load governing during electrical trip events.
