Woodward SPM-D1115B 8440-2165

Product Name: Woodward SPM-D2-1115B / 8440-2165 — Digital Synchronizer and Load Share Controller for Gen-Set Breaker Closing

Product Introduction: A panel-mount microprocessor-based device that monitors generator and bus voltage, frequency, and phase angle, then issues raise/lower bias signals to the engine governor and AVR to achieve bumpless synchronization and supports isochronous kW/kVAR load sharing among multiple generators.

Category: Woodward

Description

Technical Specifications:

Voltage Inputs: True RMS sensing, 1-phase or 3-phase PT input (typically 120 V AC L-N or 208 V L-L via PT)
Frequency Range: 50 / 60 Hz selectable
Bias Outputs: ±10 V DC or ±20 mA analog for Governor and AVR; also Raise/Lower pulse contacts available
Load Share Interface: Two analog load-share buses (active & reactive power, typically 4–20 mA)
Discrete I/O: Multiple 12/24 V DC discrete inputs for mode select, CB status, etc.; relay driver outputs
Display: 2-line LCD text display + LED synchroscope
Configuration: Via front panel keypad or Woodward Toolkit software via USB port
Protection Functions: Over/under voltage, over/under frequency, reverse power, dead bus sense
Supply Voltage: 12/24 V DC nominal (typically 18–32 V DC control power)
Front Face Rating: IP66 (when properly gasketed)
Operating Temp: −20 to +70 °C
Certifications: UL, CE, CSA

Functions & Working Principle:

Continuously compares generator and bus waveforms; computes phase difference and slip frequency.
Adjusts governor bias to match frequency and phase, adjusts AVR bias to match voltage.
On reaching sync window, closes breaker via internal/external contact. Post-close, manages load sharing via analog bus lines.

Applications: Diesel/gas generator paralleling panels, cogeneration plants, marine power management systems, emergency standby genset synchronization.

Installation & Notes:

Verify PT polarity and CT polarity (reverse CT causes false reverse-power trip).
Set correct VT ratio and CT ratio in software before commissioning.
Use shielded twisted pair for analog bias/load-share lines; keep away from high-current AC wiring.

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