Description
Product Datasheet & Technical Parameters
- Brand: WOODWARD
- Model: 9905-799
- 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, 500 Hz PWM speed bias output, Full Functions
Product Overview & Introduction
The WOODWARD 9905-799 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 specialized 500 Hz Pulse Width Modulation (PWM) speed bias output, it provides precise digital synchronization, frequency matching, and automated active power load sharing across parallel generator applications. Featuring full functional capabilities, this robust control unit ensures 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 9905-799 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 DC power supply, Wye PT configuration voltage sensing lines, 500 Hz PWM 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 9905-799 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 500 Hz PWM 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 speed bias output type does the WOODWARD 9905-799 utilize?
- A1: The unit features a specialized 500 Hz PWM (Pulse Width Modulation) speed bias output interface designed to communicate with compatible electronic governors.
- Q2: What potential transformer configuration does this specific model require?
- A2: The 9905-799 is built for use with a Wye potential transformer (PT) configuration on three-phase AC generator systems.
- Q3: Does this model include full functional capabilities?
- A3: Yes, this model includes full DSLC functions, incorporating complete synchronization, load sharing, loading/unloading control, and protection options.
