Description
Product Datasheet & Technical Parameters
- Brand: WOODWARD
- Model: 9905-361
- 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: 461 mm \times 265 mm \times 59 mm (18.15 \times 10.43 \times 2.32 in)
- Weight: Approx. 6 lbs 14 oz (3.12 kg)
- Country of Origin: USA
- Power / Input Rating: 18 to 40 VDC Continuous Power Supply Range, Three-Phase Generator Application Support
Product Overview & Introduction
The WOODWARD 9905-361 is a microprocessor-based control unit designed for paralleling, synchronizing, loading, and unloading three-phase generator sets when used with a compatible Woodward speed control and an automatic voltage regulator. It provides precise digital base load referencing, frequency trimming for isochronous load sharing, simple load droop operation, and adjustable load switch outputs with independent pick-up and drop-out points.
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 (such as pipes or cabinets), as the unit is static-sensitive. Technicians should wear natural fiber clothing and keep plastic, vinyl, and styrofoam materials away from the control modules and work area. Mount the 9905-361 unit securely inside a protective sheet metal panel enclosure for indoor use, maintaining an operating temperature range between -40^\circC and 70^\circC (-40^\circF to 158^\circF) and storage temperatures from -55^\circC to 105^\circC (-67^\circF to 221^\circF). Connect power supplies, voltage inputs, and discrete control lines strictly in accordance with the manufacturer’s engineering documentation.
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, voltage sensing inputs, control power connections, and safety interlocks are securely fastened.
- Energize the DC control power supply (18 to 40 VDC continuous) to the WOODWARD 9905-361 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 using the built-in frequency raise/lower and voltage raise/lower adjustment inputs.
- Engage the automatic synchronizing and load-sharing mode, utilizing internal ramp generators to ensure smooth transitions during paralleling.
- Shutdown Sequence:
- Gradually initiate load unloading via switch inputs or remote analog signals (4–20 mA or 1–5 VDC) to transfer active electrical load away from the generator set back to the main 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 remote load setting options are supported by the WOODWARD 9905-361?
- A1: Remote load setting is fully supported via a 4–20 mA or 1–5 VDC analog input interface.
- Q2: How can the internal digital base load reference be modified during operation?
- A2: The internal digital base load reference can be adjusted directly through designated switch inputs or via load raise and lower control signals.
- Q3: What precautions are necessary when performing maintenance on this DSLC controller?
- A3: Technicians must discharge static electricity by touching a grounded metal object, wear natural fiber clothing, and keep insulating materials like plastic, vinyl, and styrofoam away from the work area to prevent electrostatic damage.
