Digital guide
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Woodward 9905-763
Product Name: SPM-A Digital Synchronizer and Load Control Module
Product Introduction: The 9905-763 is a microprocessor-based digital synchronizer and load-sharing module within Woodward’s SPM-A series. It serves as the core control component for paralleling multiple generator sets, precisely matching generator frequency, phase, and voltage before bus connection and automatically distributing load after synchronization to prevent circulating current and connection surges.
Detailed content
Technical Specifications:
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Input Voltage: 115 VAC or 230 VAC RMS (selectable)
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Input Frequency: 400 Hz (aviation standard) / 50–60 Hz (industrial standard)
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Phase Angle Matching Accuracy: ±10°
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Voltage Matching Accuracy: 1%
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Output Options: High-impedance / Low-impedance / EPG (selectable)
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Operating Temperature: -54 °C to +66 °C (-65 °F to +150 °F)
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Maximum Power Consumption: 5 W
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Dimensions: 210 mm (H) × 315 mm (W) × 44 mm (D)
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Weight: Approx. 2 kg
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Certification: CE
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Compatible Systems: Woodward 2301 / 2301A / 2500 load-sharing systems for diesel and gas generator paralleling
Functional Features: High-impedance output is intended for 2301 load sharing; low-impedance output is intended for 2301A / EPG / 2500 load sharing. The module is a legacy spare part of the SPM-A series and is gradually being superseded by upgraded models.
Application Scenarios: Multi-generator parallel operation; diesel or gas engine driven generator load distribution; aircraft turbine, industrial engine, industrial turbine, power generation control systems, compressor and turboexpander control.
Structural Characteristics: Panel-mounted or DIN-rail mounted within a metal protective frame.
Working Principle: During paralleling, the module uses analog or discrete bias output signals to automatically match frequency, phase, and voltage. After the generator is connected to the bus, it performs load sharing to prevent surge currents and loss-of-sync conditions.
Installation Requirements: Verify system compatibility with the 2301 / 2301A / 2500 governor before installation. Install inside a control panel using panel mount or DIN rail with the supplied metal protective frame.
Usage Precautions: This is a legacy SPM-A series spare part; confirm full system compatibility prior to procurement. Ensure correct input voltage selection (115 VAC vs. 230 VAC) and proper output mode configuration (high-impedance / low-impedance / EPG).
