Description
Product Datasheet & Technical Parameters
- Brand: WOODWARD
- Model: 9905-360
- Series: DSLC (Digital Synchronizer and Load Control) Series
- Product Name: Digital Synchronizer and Load Control Unit
- Manufacturing Origin: United States
- Physical Condition: Brand New / Factory Sealed
- Dimensions: Standard Industrial Enclosure Module
- Weight: Approx. 3.1 kg (6.8 lbs)
- Country of Origin: USA
- Power / Input Rating: Standard DC Power Supply Range, Frequency Input 45 to 66 Hz, Three-phase Generator Bus and Single-phase Parallel Bus
Product Overview & Introduction
The WOODWARD 9905-360 is an obsolete Digital Synchronizer and Load Control (DSLC) unit designed for AC generator systems. Although classified as an obsolete part number, it is engineered to function correctly with newer DSLC part numbers across all standard operational features, with the sole exception of dead bus closing. It provides precise synchronization, frequency matching, and automated active power load sharing across parallel generator applications.
Operational Specifications & Guidelines
Prior to installation or handling, ensure that all electrical power sources are completely de-energized and discharge any static electricity from your body to ground by touching a grounded metal object, as the unit is static-sensitive. Mount the 9905-360 module securely inside a protective sheet metal panel control enclosure, maintaining standard operating temperature and relative humidity levels. Connect the DC power supply, frequency inputs (45–66 Hz), three-phase generator bus lines, and parallel bus lines strictly in accordance with the manufacturer’s wiring schematics. Verify all terminal connections and ensure system grounding integrity before restoring power.
Startup & Shutdown Sequencing
To prevent breaker tripping, out-of-phase synchronization, or system instability, operators must strictly follow the defined startup and shutdown procedures.
- Startup Sequence:
- Verify all external wiring, potential inputs, control power connections, and safety interlocks are securely fastened.
- Energize the DC control power supply to the WOODWARD 9905-360 module and wait for the internal diagnostic self-test to complete successfully.
- Start the prime mover and allow it to reach rated nominal speed and thermal stability under governor control.
- Enable the synchronizer module to monitor bus and generator frequency and phase parameters.
- Engage the automatic synchronizing and load-sharing mode, allowing the unit to execute precise speed adjustments and issue the close command to the circuit breaker precisely at the synchronous point, keeping in mind that dead bus closing functions require alternative handling due to obsolescence limits.
- Shutdown Sequence:
- Gradually transfer active electrical load away from the generator set back to the main utility grid or companion units until minimum baseline load is achieved.
- Open the main generator circuit breaker manually or via system command to isolate the unit electrically from the busbar.
- Initiate the prime mover cool-down cycle at idle speed for the required duration.
- Issue the stop command to shut down the engine or turbine completely.
- De-energize the auxiliary control power to the module only after the prime mover has come to a complete standstill.
Frequently Asked Questions (Q&A)
- Q1: Will the WOODWARD 9905-360 operate correctly when mixed with newer DSLC part numbers in a system?
- A1: Yes, the 9905-360 will function correctly with the new DSLC part numbers in all operational functions except for dead bus closing.
- Q2: What is the status of this specific DSLC part number?
- A2: The 9905-360 is an obsolete DSLC part number, though it remains compatible with newer hardware revisions for standard paralleling and load control tasks.
- Q3: What precautions should be taken when installing legacy DSLC units?
- A3: Ensure proper static discharge precautions are taken during handling, verify all wiring harnesses against legacy pinouts, and account for the dead bus closing limitation when designing system breaker logic.
