Description
⚙️ Product Datasheet & Technical Parameters
- Brand: WOODWARD
- Model: 9905-704 (DSLC)
- Series: DSLC Digital Synchronizer and Load Control Series
- Product Name: Digital Synchronizer and Load Control Unit
- Place of Origin: United States
- Condition Status: Brand New / Factory Original Surplus
- Dimensions: Approx. 460.65 mm x 264.16 mm x 58.42 mm (Sheet Metal Back Plate Enclosure)
- Weight: Approx. 6 lbs 14 oz (3.1 kg)
- Original Region: USA Manufacturing Plant
- Output & Configuration: 500 Hz PWM speed bias output, Open Delta PT Configuration, and Reduced Functions for AC generators
📖 Product Overview & Description
The Woodward 9905-704 is a microprocessor-based Digital Synchronizer and Load Control (DSLC) module engineered for alternating current industrial generators. Featuring reduced functions, this specific model is tailored for applications that focus on core synchronization, loading, and unloading tasks without extraneous multi-function features.
Equipped with a 500 Hz PWM speed bias output and an Open Delta potential transformer (PT) configuration, the unit delivers precise regulation when paired with a compatible electronic speed control and automatic voltage regulator. Its robust architecture ensures reliable parallel operation and smooth power management across industrial generator sets.
🛠️ Operating Specifications & Usage Methods
Proper installation and wiring are essential for stable system performance. All PT sensing lines, communication links, and control inputs must use shielded twisted-pair cables routed away from high-voltage distribution lines and variable frequency drives to prevent electromagnetic interference. The module must be securely mounted inside a protective industrial control enclosure.
During commissioning, configure all operational parameters—such as loading rates, frequency bias limits, and synchronization settings—using an authorized handheld programmer terminal or service tool. Verify signal integrity across all voltage and current inputs before initiating any live system start-up or synchronization sequences.
⚡ Startup & Shutdown Sequence
Following a structured startup and shutdown sequence protects the prime mover, generator windings, and electrical switchgear from mechanical shock and electrical transients.
- Startup Sequence: First, inspect all mechanical linkages, fuel valves, and safety interlocks. Energize the DC control power supply to the 9905-704 unit and verify that all status diagnostics indicate normal operation via the programming terminal. Crank and start the prime mover, bringing it up to its rated operational speed and nominal voltage. Engage the synchronization mode to monitor phase angle or slip frequency, allowing the unit to automatically issue breaker close commands once parameters safely align.
- Shutdown Sequence: Begin by ramping down active power generation through controlled unloading commands until minimum load is achieved. Open the main generator circuit breaker to decouple the unit from the shared electrical busbar. Allow the prime mover to run at a no-load idle state for thermal stabilization cool-down. Issue the stop command to shut down the engine, and finally de-energize the control power supply once all equipment has come to a complete standstill.
❓ Frequently Asked Questions (Q&A)
- Q1: What type of speed bias output does the Woodward 9905-704 feature?
- A1: The unit features a 500 Hz PWM speed bias output for interfacing with compatible electronic speed controls.
- Q2: What PT configuration does this specific DSLC model utilize?
- A2: It utilizes an Open Delta PT configuration for voltage sensing.
- Q3: What does the “Reduced Functions” specification indicate for this model?
- A3: It indicates that the controller is optimized for essential synchronizing, loading, and unloading tasks while omitting advanced or specialized extra options.
