Description
⚙️ Product Datasheet & Technical Parameters
- Brand: WOODWARD
- Model: 9905-029 (SPM-A)
- Series: SPM-A Synchronizer Series
- Product Name: Synchronizer Unit
- Place of Origin: United States
- Condition Status: Brand New / Factory Original Surplus
- Dimensions: Standard Panel Mount Enclosure (Approx. 150mm x 120mm x 60mm)
- Weight: Approx. 1.2 kg
- Original Region: USA Manufacturing Plant
- Power & Frequency Rating: 115 or 230 VAC RMS input voltage, 50/60 Hz frequency rating (applicable to both Bus and Generator)
- Matching & Output Options: Voltage matching of 1 percent, with three selectable output options: high impedance, low impedance, and EPG
📖 Product Overview & Description
The Woodward SPM-A Synchronizer (Part 9905-029) is a precise automatic synchronizing instrument designed to safely parallel generator sets to an energized electrical bus. By continuously monitoring and comparing the voltage, frequency, and phase angle of both the incoming generator and the bus, the unit determines the exact moment to issue a breaker close command, minimizing electrical transients and mechanical shock.
Featuring a voltage matching capability of 1 percent, this model ensures high precision during parallel operations. Furthermore, it is equipped with three flexible output options—high impedance, low impedance, and EPG—allowing seamless integration with a broad assortment of prime mover speed controls and governing actuators.
🛠️ Operating Specifications & Usage Methods
Proper installation and wiring integrity are essential for accurate and reliable generator synchronization. All control wiring, as well as Bus and Generator potential transformer (PT) input lines, must use shielded twisted-pair cables routed away from high-voltage power lines to prevent signal distortion and phase mismatch.
During system commissioning, ensure that input jumpers or configurations are correctly set for the local nominal voltage (115 or 230 VAC RMS) and system frequency (50/60 Hz). Select the proper output option (high impedance, low impedance, or EPG) matching the control specifications of your governor, and carefully calibrate the voltage and phase matching tolerances prior to live testing.
⚡ Startup & Shutdown Sequence
Following a structured startup and shutdown procedure safeguards the generator, electrical switchgear, and control electronics from stress and surges.
- Startup Sequence: First, inspect all mechanical linkages, safety interlocks, and circuit breaker controls. Energize the control architecture and confirm that Bus and Generator PT inputs provide steady, accurate voltage measurements. Power on the SPM-A synchronizer and verify that status indicators show normal operation. Bring the incoming generator up to its rated operational speed and nominal voltage. Activate the synchronizer to monitor phase angle and slip frequency, allowing it to automatically trigger the breaker close signal once all parameters align.
- Shutdown Sequence: Begin by gradually reducing the active power of the generator through load-shedding commands until minimum load is achieved. Open the main generator circuit breaker to decouple the unit from the shared busbar. Allow the prime mover to run at a no-load idle state for proper thermal stabilization cool-down. Issue the shutdown command to stop the fuel supply, and finally de-energize the control power supplies once all mechanical components have completely stopped.
❓ Frequently Asked Questions (Q&A)
- Q1: What output options are available on the Woodward 9905-029 synchronizer?
- A1: The unit features three distinct output options: high impedance, low impedance, and EPG, ensuring compatibility with various governor types.
- Q2: What is the voltage matching precision of this specific SPM-A model?
- A2: Part number 9905-029 provides a tight voltage matching capability of 1 percent.
- Q3: What input power and frequency ratings does the unit support?
- A3: It supports 115 or 230 VAC RMS input voltages and operates on standard 50/60 Hz frequency systems for both Bus and Generator inputs.
