WOODWARD | 9905-798 | DSLC Digital Synchronizer Load Control

Description

📊 Product Technical Parameters

• Brand: WOODWARD
• Model: 9905-798
• Series: DSLC (Digital Synchronizer and Load Control) Series
• Product Name: Digital Synchronizer and Load Control Module for Three-Phase AC Generators
• Country of Origin: USA
• Condition Status: Industrial Factory Original / Industrial Surplus
• Dimensions: Standard modular enclosure format (approx. 460.65 mm x 264.16 mm x 58.42 mm)
• Weight: Less than 3.2 kg (7 lbs)
• Original Region: United States
• Power Supply / Rating: 120/240 VAC voltage input configuration with reduced functional level

⚙️ Operation Specifications and Usage Methods

• Installation Preparation: Ensure all power sources to the generator control panel are completely locked out. Mount the modular chassis securely inside an industrial enclosure, adhering to proper static-safe grounding practices.
• Parameter Configuration: Configure the 120/240 VAC voltage inputs and set up the Wye potential transformer (PT) configuration. Calibrate the 500 Hz pulse-width modulation (PWM) speed bias output using a handheld programmer or configuration software to match the governor’s requirements. Note that this reduced-function model omits advanced power factor control and process control features.
• Operational Control: Connect the unit into the generator network to automate synchronizing, automatic loading/unloading, and isochronous load sharing using the integrated digital communications network.

⚡ Startup and Shutdown Sequence

• Startup Sequence:
  1. Inspect all terminal wiring, verifying isolation across the Wye PT configuration and 120/240 VAC lines.
  2. Energize the system power supplies and check that the module initializes cleanly without faults.
  3. Start the prime mover and bring the generator up to rated operating speed and nominal voltage.
  4. Engage the automatic synchronization and load sharing sequence to allow the unit to match frequency and phase before issuing the breaker close command, followed by active load control via the 500 Hz PWM speed bias.
• Shutdown Sequence:
  1. Transfer active electrical load away from the generator unit using manual or automated base-load shedding.
  2. Open the generator circuit breaker to decouple the unit from the shared electrical busbar.
  3. Shut down the prime mover engine or turbine according to standard mechanical safety protocols.
  4. De-energize the input power supplies and control circuits once the system is fully offline.

💡 Product Description

The Woodward 9905-798 is a microprocessor-based Digital Synchronizer and Load Control (DSLC) module designed for paralleling, synchronizing, loading, and unloading three-phase AC generator sets. Built with a Wye PT configuration, a 120/240 VAC voltage input range, and a 500 Hz PWM speed bias output, this reduced upgrade-level model provides essential automated paralleling, dead-bus closing, and true RMS power sensing without complex power factor or process loops.

❓ Frequently Asked Questions (Q&A)

• Q: What speed bias output does the 9905-798 model use?
  • A: It utilizes a 500 Hz pulse-width modulation (PWM) speed bias output signal.
• Q: Does this model support power factor or process control?
  • A: No, the 9905-798 is a reduced upgrade-level model that omits power factor control and process control functions.
• Q: What PT configuration is built into this specific part number?
  • A: It features a Wye potential transformer (PT) configuration.