1. Woodward 9907-164 | Original Microprocessor Governor Unit

2. Unboxing & Physical Snapshot

• Model & Brand: Woodward 9907-164
• Product Type: Woodward 505 Digital Governor / Microprocessor-Based Turbine Control Unit for steam turbines, turbine generators, and turboexpanders. The 9907-164 version is the low-voltage DC supply model within the 505 controller family.
• Primary Application:
  • Steam turbine speed control
  • Load regulation
  • Single extraction and/or admission turbine control
  • Actuator positioning and protective control functions
• Approximate Physical Dimensions (W × H × D):
  • Approximately 356 × 280 × 102 mm (14 × 11 × 4 in)
• Estimated Shipping Weight:
  • Unit weight: approximately 4.1 kg (9.1 lb)
  • Typical packaged shipping weight: 5–6 kg
• What’s in the Box:
  • Woodward 9907-164 505 Digital Governor Controller
  • Front operator keypad/display assembly
  • Terminal connection interfaces
  • Mounting hardware (when supplied)
  • Protective packaging
  • Product documentation when available

3. Product Introduction

The Woodward 9907-164 is installed as the primary electronic governor interface within a turbine control cabinet, where it receives speed feedback, operator commands, and process signals before issuing actuator control outputs. The controller uses a microprocessor-based architecture with local keypad programming and display functions for turbine setup and operational monitoring (—which is critical during commissioning and outage recovery when engineers need direct access to control parameters).

This controller is a turbine-critical asset, not a simple replacement circuit board. Verify the turbine application, actuator configuration, software revision, and parameter backup before installation. Check the configuration file. Check the wiring drawings. A replacement unit with the same catalog number still requires validation against the existing turbine control scheme.

4. Core Technical Specifications

Parameter	Value
Manufacturer	Woodward
Model	9907-164
Product Family	505 Digital Governor
Application	Steam turbine control
Controller Type	Microprocessor-based digital governor
Power Supply	18–32 VDC (24 VDC nominal)
Typical Power Consumption	Approximately 24 W
Speed Input	Magnetic pickup / speed sensing input
Actuator Control	Single or split-range actuator control
Analog Inputs	6 programmable 4–20 mA inputs
Discrete Inputs	16 contact inputs (4 dedicated, 12 programmable)
Relay Outputs	Configurable relay outputs
Analog Outputs	Multiple configurable 4–20 mA outputs
Communication Interface	RS-232 / RS-422/485 options
Communication Protocol	Modbus support
Local Interface	Two-line, 24-character LCD display with keypad
Protection Rating	IP56 when installed in suitable enclosure
Operating Temperature	Approximately -4°F to +140°F (-20°C to +60°C)
Storage Temperature	Approximately -40°F to +185°F (-40°C to +85°C)
Mounting Method	Panel mounting
Weight	Approximately 4.1 kg

Woodward 9907-164

5. ? Global Compliance & Industry Certifications

Expected regulatory approvals for the Woodward 9907-164 include:

• CE Mark
  • Applies when the controller is installed according to Woodward requirements and integrated into a compliant turbine control system.
• UL/cUL Listed
  • May apply depending on the complete control cabinet approval and installation configuration.
• ATEX / IECEx
  • Hazardous-area suitability depends on the enclosure, installation method, and certified system design. The controller should not be assumed suitable for hazardous locations without nameplate verification.
• Marine Approvals (DNV GL)
  • Applicable only when included in a marine-certified turbine or propulsion control package.

Certification records matter for turbine governors because incorrect control hardware can affect overspeed protection, actuator movement, and emergency shutdown functions.

Verify specific lot certifications with OEM.

6. ? Long-Term Storage & Asset Preservation Guide

Keep the 9907-164 inside an anti-static (ESD) protective bag during warehouse storage. Protect the front display window, keypad membrane, terminal blocks, and rear connectors from dust and mechanical impact.

Maintain storage humidity below 60% RH. Moisture exposure can degrade PCB coatings, connector contacts, and internal electronic assemblies.

For units stored longer than two years, inspect before energization. Review the date code, conformal coating condition, terminal oxidation, and backup configuration records (—especially important for turbine controls stored as emergency outage replacements).

Maintain a preservation log including serial number, firmware revision, and last inspection date.

7. Physical Installation Prerequisites

• Install the 9907-164 inside a suitable turbine control cabinet.
• Use the specified panel mounting arrangement.
• Provide a clean 24 VDC power source within the required voltage range.
• Connect protective earth according to plant electrical standards.
• Use shielded wiring for speed sensor and analog signal circuits.
• Verify actuator wiring before startup.
• Maintain cabinet airflow for heat removal.
• Leave approximately 50 mm clearance around ventilation and service areas where cabinet design allows.
• Protect the controller from oil mist, condensation, and excessive vibration.
• Load and verify the correct turbine configuration parameters before operation.

8. Buyer’s FAQ (Logistics & Compliance Focus)

Q: What HS Tariff Code is commonly used for the Woodward 9907-164?

A: Turbine governor controllers are commonly reviewed under HS 9032 categories for automatic regulating and controlling instruments. The final classification depends on destination customs interpretation.

Q: Why does Country of Origin (COO) matter for this turbine controller?

A: COO affects customs clearance, import duties, and traceability documentation. The commercial invoice, packing list, and certificate of origin should contain consistent manufacturer and model information.

Q: Is shipping insurance recommended for the 9907-164?

A: Recommended. The controller contains precision electronic boards, display components, and configuration memory. Shock, moisture, or electrostatic exposure during transport may create failures that are not immediately visible.

Q: Does the 9907-164 include the latest firmware pre-loaded?

A: The controller includes factory-installed firmware, but turbine-specific configuration parameters are application dependent. Confirm software revision, parameter files, and existing turbine settings before replacement.