Description
Product Datasheet & Technical Parameters
- Brand: WOODWARD
- Model: 9905-603
- 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 (461 \times 265 \times 59 mm)
- Weight: Approx. 6 lbs 14 oz (3.12 kg)
- Country of Origin: USA
- Power / Input Rating: Three-phase AC generator application, Wye PT configuration, 1 to 5 VDC speed bias output, direct replacement for part number 9905-712
Product Overview & Introduction
The WOODWARD 9905-603 is an advanced microprocessor-based Digital Synchronizer and Load Control (DSLC) unit engineered specifically for three-phase AC generator systems. Designed with a Wye potential transformer (PT) configuration and a reliable 1 to 5 VDC speed bias output, it provides precise digital synchronization, frequency matching, and automated active power load sharing across parallel generator applications. This unit serves as an authorized, direct replacement for the legacy 9905-712 model, ensuring seamless operational stability and safety during parallel switching and load management tasks in critical industrial environments.
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 9905-603 module securely inside a protective sheet metal panel control enclosure, maintaining an operating temperature range between -40^\circC and 70^\circC and relative humidity levels up to 95\%. Connect the power supply, Wye PT configuration voltage sensing lines, 1 to 5 VDC speed bias output lines, and three-phase generator bus wiring 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, Wye PT sensing inputs, control power connections, and safety interlocks are securely fastened.
- Energize the DC control power supply to the WOODWARD 9905-603 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, voltage, and phase parameters.
- Engage the automatic synchronizing and load-sharing mode, allowing the unit to execute precise speed bias adjustments via the 1 to 5 VDC output interface and issue the close command to the circuit breaker precisely at the synchronous point.
- 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: What legacy part number does the WOODWARD 9905-603 directly replace?
- A1: The 9905-603 is engineered as a direct replacement model for the older Woodward 9905-712 DSLC unit.
- Q2: What are the PT configuration and speed bias output specifications for this model?
- A2: This model utilizes a Wye potential transformer (PT) configuration and incorporates a 1 to 5 VDC speed bias output interface.
- Q3: What precautions should be observed when installing this DSLC controller?
- A3: Technicians must ensure all power sources are locked out, discharge static electricity to a grounded metal object before handling the unit due to its static-sensitive electronics, and follow standard wiring diagrams.
