Digital guide
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Woodward 9907-687
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Product Name (reference): MSLC Master Synchronizer and Load Control
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Product Introduction: A microprocessor-based overall plant load control designed for use with Woodward DSLC controls on each generator, providing utility synchronizing, paralleling, loading/unloading of a three-phase generating system.
Detailed content
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Technical Specifications (reference MSLC platform):
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Power Supply: 120/240 VAC (model-dependent)
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Operating Temperature: –40 to +70°C
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Storage Temperature: –55 to +105°C
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Humidity: 95% RH at 38°C
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CT Input: 0–5 A, max 7 A; burden <0.1 VA per phase
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EMS: ANSI/IEEE C37.90.2; ANSI C37.90.1-1989
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Certifications: UL and cUL listed
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Functional Features:
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Phase matching or slip-frequency synchronizing with voltage matching
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Automatic system loading/unloading for bumpless load transfer
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Import/Export level control
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Process control for cogeneration, pressure, or other processes
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Proportional loading of associated DSLC controls in isochronous load sharing
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Adjustable power factor control
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Multi-function adjustable high/low limit alarms and load switches with relay driver outputs
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Digital communications network (LonWorks) to DSLC-equipped generators
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Full setup, metering, and diagnostics via handheld programmer
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Working Principle: Uses digital signal processing to derive true RMS voltages and relative phase angles of utility and local bus waveforms. Generates raise/lower signals to DSLC speed controls and voltage regulators for automatic synchronization and load sharing.
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Application Scenarios: Three-phase generating plants with multiple DSLC-controlled generators paralleling to utility; cogeneration facilities; import/export power management.
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Installation Requirements: Install per Woodward MSLC manual 02022; proper grounding and shielded wiring for PT/CT inputs; LonWorks network cabling to individual DSLC units.
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Usage Notes: Verify the specific voltage configuration (120 V vs 240 V, Wye vs Delta) before installation; do not remove PCB from cabinet except when necessary, and follow ESD precautions; confirm 9907-687’s exact configuration with Woodward documentation.
