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Woodward 8440-2165 (SPM-D2-11) Synchronization Controller

The Woodward 8440-2165, designated as the SPM-D2-11, is a high-precision, micro-controller managed synchronization unit designed to automate the paralleling of alternating current generators with commercial mains or other operating power sources. This specific instrument focuses on taking the guesswork out of breaker timing by continuously measuring voltage and frequency vectors across separate buses.

Unlike full-scale power management systems, the SPM-D2-11 acts as a dedicated, hyper-focused synchronization specialist. It drives analog or discrete speed and voltage bi-directional bias signals directly to the engine governor and automatic voltage regulator (AVR). Once the ideal slip frequency and phase alignment are achieved, the module commands a precise close signal, protecting your heavy rotating machinery from damaging torsional impacts.

• Brand/Origin: Woodward Governor Company

• Model Number: SPM-D2-11

• Part Number Identification: 8440-2165

• System Phase Topology: 3-Phase AC systems

• Voltage Sensing Inputs: Rated for standard industrial bus and generator potentials (typically 100V / 400VAC configurations)

• Frequency Operating Window: 50 Hz / 60 Hz nominal settings

• Bias Control Signals: Configurable analog bias outputs combined with relay-based raise/lower pulses

• Mounting Setup: Compact housing optimized for standard DIN rail integration or rear-panel layout

• Status Indication: Multi-LED frontal array showing synchronization status, phase error, voltage error, and breaker command state

• Isolation Protection: High galvanic isolation between measuring circuits, power supply, and control relays

• Phase Matcher & Slip Synchronizer Combo: Features two distinct operational modes—precise phase matching or slip-frequency synchronization—allowing operators to tailor breaker closure mechanics to specific alternator dynamics.

• Two-Channel Safety Logic: Integrates independent internal hardware monitoring channels to prevent accidental close commands if an internal component or microprocessor fault occurs.

• Dead-Bus Closing Capability: Built-in logic detects if the main utility bus is completely unpowered, allowing the generator breaker to close immediately and establish emergency baseline power.

• Direct Governor & AVR Coupling: Features responsive, low-drift correction signals that interface seamlessly with both legacy analog equipment and modern digital control networks.

• Ruggedized Stationary Housing: Designed with a vibration-resistant enclosure, making it a reliable fit for harsh switchgear rooms and power houses.

• Gas & Diesel Generation Plants: Installed within local control cubicles to safely tie individual prime movers into a unified factory power bus.

• Hydroelectric Power Stations: Managing the specialized, sensitive synchronization loops required by hydro turbines during grid interlocking.

• Packaged Switchgear Upgrades: Utilized by control system integrators to add modern, reliable automatic synchronization to older, manual-only control panels.

• Marine Auxiliary Power: Used on commercial vessels to safely parallel secondary diesel generator units during high-load docking operations.

Q1: What separates the SPM-D2-11 (8440-2165) from the standard SPM-D10 series controllers? 

A: The SPM-D2 series provides enhanced structural features and dual-bus tracking capacities compared to the baseline D10 line. The "11" package variant dictates the exact combination of analog/digital bias control configurations and voltage input ratings designed for specific mid-to-high voltage switchgear setups.

Q2: Does this module handle continuous load sharing after the generator breaker closes? 

A: No. The 8440-2165 SPM-D2-11 is a dedicated synchronizer. Its primary role ends the moment the breaker closes successfully. For ongoing active and reactive kW/kVAR load sharing post-closure, a companion load-sharing module or an all-in-one controller (such as the easYgen series) is required.

Q3: Can the voltage and frequency tolerance windows be field-adjusted? 

A: Yes. The parameter configuration can be customized via the front interfaces or connection software to establish how strict the phase angle, voltage variation, and frequency slip windows must be before a close signal is released.

Q4: How does the unit react if the generator and the bus cannot reach synchronization within a set time frame? 

A: The SPM-D2-11 includes an internal synchronization timer loop. If the engine governor or AVR fails to pull the alternator into the programmed tolerance window within the allocated time, the unit ceases close commands and triggers an external synchronization timeout alarm.

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