Woodward 9907-1199 Steam Turbine Digital Controller Unit

Description

Product Introduction

The Woodward 9907-1199 is an advanced 505D series digital speed governor controller engineered to manage single-actuator steam turbines across power generation, petrochemical, and industrial mechanical drive applications. Representing the modern evolution of the classic 505 platform, this controller processes dual magnetic pickup (MPU) or proximity sensor inputs and executes real-time PID governing algorithms to modulate electro-hydraulic valve actuators with extreme precision.

Equipped with a high-voltage power supply accepting 88–132 VAC / 90–150 VDC or 180–264 VAC mains, the 9907-1199 is designed for direct control cabinet mounting where 24 VDC bus power is unavailable. It upgrades legacy serial communication to include dual Ethernet ports alongside RS-232/RS-485 serial interfaces, enabling seamless integration into modern plant DCS and SCADA networks using Modbus TCP or RTU protocols.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

Picture this: It’s 2:15 AM on a night shift at a combined heat and power plant. An auxiliary boiler feed pump steam turbine trips due to an internal power supply fault on its older legacy controller, causing steam drum water levels to plummet. The plant faces a full boiler trip costing over $50,000 an hour in ungenerated power and process downtime. Having a pre-configured 9907-1199 replacement ready in the store room allows your instrument technicians to swap the unit into the panel cutout, land the terminal blocks, load the pre-saved configuration via Ethernet, and restore feed pump pressure in under 35 minutes.

• Power Generation Auxiliary Turbines: Precision governing on boiler feed pump drives, draft fans, and lube oil pump turbines.
• Petrochemical Mechanical Drives: Speed regulation for steam turbine-driven synthesis gas and refrigerant compressors.
• District Heating Cogeneration Facilities: Managing steam turbine generators supplying district steam lines and local grids.
• General Industrial Mechanical Skids: Operating mechanical drive turbines in paper mills, sugar mills, and chemical processing skids.

9907-1199

9907-1199

Transparency SOP: Quality Assurance & Testing

Every Woodward 9907-1199 unit undergoes a rigorous bench testing protocol before dispatch:

1. Inbound Visual & Hardware Audit: We inspect display screens, membrane keys, chassis integrity, connector pins, and OEM serial labels for signs of damage or wear.
2. High-Voltage Power Supply Bench Test: The internal power supply is energized under both 120 VAC and 230 VAC inputs to confirm DC voltage rail stability and power converter health.
3. Dual Speed Frequency Injection: Using signal generators, frequency sweeps from 10 Hz to 15 kHz are injected into both MPU channels to verify speed measurement accuracy and overspeed trip response.
4. Actuator Current Loop Sweep: The 4–20 mA / 0–200 mA actuator driver channel is swept across its full range while measuring output linearity under electrical load.
5. Network & Serial Communication Test: Both Ethernet ports and serial interfaces are polled using Modbus test software to confirm register read/write integrity.

The Veteran’s Tech Trap Guide

• ⚠️ Confirm Supply Voltage Ratings Before Wiring: The 9907-1199 is a high-voltage unit. Applying 24 VDC logic power to its primary supply terminals will prevent the unit from booting, while connecting high-voltage AC to a 24 VDC low-voltage unit will destroy the internal power circuit instantly.
• ❗ Export Your Configuration File First: Before removing a dead or malfunctioning controller, connect via Ethernet using Woodward’s configuration tool (or manually record parameters from the screen). Replacement units ship with default settings and must be flashed with your specific turbine dynamics before operation.
• ⚠️ Ground Speed Cable Shields at the Controller Chassis: Connect MPU cable shielding strictly to the dedicated ground terminal on the 9907-1199. Grounding the shield at both the sensor tip and the controller creates ground loops that introduce noise, leading to speed feedback jitter or false overspeed trips.
• ❗ Verify Actuator Output Impedance Jumpers: Ensure internal driver configuration matches your electro-hydraulic actuator specifications (whether 4–20 mA or low-impedance 0–200 mA coils). Mismatched settings will restrict valve movement or throw actuator fault codes.

Frequently Asked Questions

Q: What is the main difference between the Woodward 9907-167 and 9907-1199?

A: Both are high-voltage digital governors for single-actuator steam turbines. However, the 9907-1199 is an updated 505D platform featuring dual Ethernet ports for Modbus TCP communications and enhanced software configuration options compared to older 505 variants.

Q: Can the 9907-1199 be used on an extraction or admission steam turbine?

A: No. The 9907-1199 is designed for single-actuator steam turbines. Dual-actuator extraction or admission turbines require a 505E series controller, such as the Woodward 9907-029.

Q: How do I clear an “Overspeed Trip” fault on the front panel?

A: Ensure turbine speed has dropped below the overspeed reset threshold, then press the front panel RESET key or energize the configured discrete “Remote Reset” input contact.

Q: Does this unit support Ethernet SCADA integration?

A: Yes. The 9907-1199 includes dual RJ45 Ethernet ports supporting Modbus TCP protocol, allowing plant DCS and SCADA systems to monitor real-time turbine speed, valve position feedback, operating modes, and active alarms.

Q: What warranty coverage applies to surplus or refurbished 9907-1199 units?

A: Every unit supplied carries a complete 12-month operational warranty covering all internal hardware components and functional performance.