Woodward 8440 series industrial power control units cover two core product lines: SPM-D11 generator synchronizer family (8440-1706, 8440-1706A) and EasyGen / DTSC genset & ATS controllers including 8440-1666B digital governor, 8440-2047 EasyGen multi-generator parallel controller, fully documented in Industrial Turbine Catalog Manual 25182, Manual 37259 for SPM-D11.
Woodward 8440 Series Synchronizer, Governor & Genset Parallel Controllers
Series General Overview
The Woodward 8440 product family is a unified hardware part number platform for power generation automation equipment, officially listed in the Woodward Industrial Turbine Products Catalog Manual 25182. This series is split into two independent core product branches with distinct functional positioning:
SPM-D11 Synchronizer Line: 8440-1706, 8440-1706A – microprocessor-based generator synchronizing & load sharing modules, successor to the SPM-D2 paralleling series shown in the catalog sheet, dedicated to genset grid parallel, island load balance control.
EasyGen / DTSC / Digital Governor Control Line: 8440-1666B, 8440-2047 – integrated genset speed control, ATS auto transfer, multi-unit parallel comprehensive controllers for diesel/gas reciprocating generator sets.
All four target part numbers comply with global power industry certifications (Class I Div 2 hazardous location, CE EMC, DNV marine), support Modbus RTU communication for DCS/SCADA remote monitoring, and serve distributed power plants, offshore platforms, refinery backup power, and marine vessel power systems.
Branch 1: SPM-D11 Synchronizer Sub-Series (8440-1706 & 8440-1706A)
Series Positioning
SPM-D11 is Woodward’s mid-to-high-end single-circuit-breaker synchronizer platform, complementary to the entry-level SPM-D2 series in Manual 25182, focused on precise frequency, voltage, and phase matching for generator-grid parallel operation, with native active/reactive load sharing, generator protection, and power factor regulation logic. Official supporting document: SPM-D11 Hardware Manual 37259E, Product Spec 37623.
Model Differentiation
1. Woodward 8440-1706 – Standard SPM-D11 Synchronizer
Base standard hardware revision of SPM-D11, designed for conventional 3-phase generator paralleling projects.
Core Functions: Automatic slip frequency synchronization, analog speed/voltage bias output for Woodward governors, isochronous load sharing for up to 32 parallel gensets, dead bus startup support, over/under voltage/frequency generator protection.
Hardware Spec: Dual-line red LED digital display, discrete relay bias outputs, analog load share wiring terminals, universal wide-range 9.5–32 VDC power supply, standard -20℃ ~ +70℃ operating temperature.
Application: On-land industrial gas/diesel generator grid-parallel cabinets, small combined heat & power (CHP) units.
2. Woodward 8440-1706A – Upgraded SPM-D11 Rev A Synchronizer
Enhanced revision A hardware iteration of 8440-1706 with multi-point upgrades for harsh industrial environments:
Anti-sulfur conformal-coated PCB to resist salt fog & chemical vapor corrosion;
Extended wide temperature range (-40℃ ~ +70℃) for cold northern field and high-temperature boiler room installations;
Expanded fault event memory storage for 500+ timestamped alarm logs;
Reinforced shock-absorbing internal structure for high-vibration engine skid cabinets;
Optional marine DNV/ABS certification for offshore vessel power systems.
Core Control Algorithms fully consistent with base 8440-1706, drop-in direct replacement for legacy SPM-D2 synchronizers listed in Manual 25182.
Application: Offshore platform auxiliary gensets, chemical refinery backup power, waste incineration power plant generator parallel control.
Universal Core Features of SPM-D11 (8440-1706 / 8440-1706A)
Full Synchronization Logic
Auto-match generator & busbar frequency, voltage, and phase angle; configurable slip window and breaker closing advance timer to eliminate cross-current impact during paralleling. Supports both live bus grid tie and dead bus black-start synchronization modes.
Multi-Unit Load Sharing System
Native kW/kVAR active/reactive power balance control, analog load share bus wiring compatible with all Woodward digital governors (505, 721, 723PLUS series). Adjustable droop & isochronous operating modes for grid-connected and island power grids.
Comprehensive Generator Protection Suite
Built-in loss-of-speed, overvoltage, undervoltage, overfrequency, underfrequency, reverse power protection with configurable alarm and trip relay outputs to isolate faulty generator units automatically.
Flexible Communication & Configuration
Local parameter setup via front-panel keypad, remote monitoring through RS485 Modbus RTU interface; compatible with Woodward ToolKit PC configuration software for offline programming and firmware upgrades.
Rugged Industrial Panel Mount Design
Standard DIN flush panel mounting dimension, IP54 dust/water splash front panel protection, Class I Division 2 hazardous area certification for refinery and gas plant engine rooms.
