Product Short Description
Product Name
SPM-A Automatic Synchronizer
Product Introduction
The Woodward 9905-001 SPM-A is an automatic synchronizer module designed to match the phase, frequency, and voltage of a generator to the bus before closing the breaker. It compares generator and bus signals in real time, then issues raise/lower commands to the speed governor and voltage regulator to bring the two systems into alignment. When sync conditions are satisfied, the module closes a “sync check” relay to permit breaker closure.
Description
Technical Specifications
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Supply Voltage: 24 V DC (typical)
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Frequency Range: 45–65 Hz
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Voltage Input: 90–150 V AC (PT-derived)
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Phase Sync Range: ±40° auto-correction
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Speed Control Output: ±3 V DC (to governor)
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Voltage Control Output: ±5 V DC (to AVR)
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Response Time: <50 ms
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Operating Temperature: −20 °C to +70 °C
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Protection: IP54 (when installed inside control cabinet)
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Weight: 1.8 kg
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Mounting: Panel or control cabinet backplate
Functional Features
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Automatic phase, frequency, and voltage matching.
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High-precision comparison circuitry minimizes paralleling error.
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Compatible with most Woodward or third-party governors and AVRs.
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Built-in protection: blocks synchronization on over-voltage, under-frequency, or phase-angle out-of-limit.
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Analog and relay outputs for easy integration into PLC/DCS.
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Manual/automatic mode switch for commissioning or special conditions.
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Industrial-grade PCB with enhanced anti-vibration, EMI resistance, and salt-spray tolerance.
Application Scenarios
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Marine Power: Multi-generator paralleling for shipboard stability.
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Industrial Power Plants: Generator-to-grid synchronization.
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Backup Power Systems: Automatic paralleling of standby generators.
Working Principle
The synchronizer continuously samples generator and bus voltage via PT inputs. It measures frequency difference, phase-angle difference, and voltage magnitude difference. Based on these errors, it outputs a ±3 V DC signal to the governor to adjust speed, and a ±5 V DC signal to the AVR to adjust excitation. When all three parameters fall within the preset windows, the sync-check relay energizes to allow breaker closure.
Installation Requirements
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Mount on panel or cabinet backplate; ensure IP54 environment.
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Connect PT input from generator and system bus.
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Wire “Frequency Adjust” (Raise/Lower) to governor input.
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Wire “Voltage Adjust” to AVR input.
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Wire “Sync Check Relay” contact to breaker close coil.
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Confirm control cabinet grounding to avoid noise interference.
Usage Precautions
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Verify PT polarity and ratio before energizing.
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Check that supply voltage matches 24 V DC nominal.
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Do not operate outside −20 °C to +70 °C.
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Inspect terminal tightness every 3–6 months.
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Keep surface dust-free and ventilation unobstructed.
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Monitor sync time history; abnormal increase indicates potential fault.
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