I. Basic Model Information
Part Number: 8440-1706 E (SPM-D11 LSXR)
Brand: Woodward
Full Name: Synchronizer & Load Sharing Module
Application: Specifically for diesel / gas / steam generator sets in cabinets, used in combination with 505/505E governors and AVR voltage regulators to achieve multi-machine parallel operation, automatic synchronization, and equal distribution of active and reactive power.
Core Functions
Fully automatic synchronization and grid connection
Simultaneously collect voltages, frequencies, and phases of the generator and busbar, automatically adjust the rotational speed and voltage of the units, precisely match and output the closing signal, supporting dead busbar startup (self-network formation of the unit without external power supply).
Active load distribution (Load Share)
When multiple units are connected in parallel, evenly distribute active power, with soft decoupling, anti-reverse power, and support for import/export power limits.
Reactive / Power Factor Control
Output offset signal to the AVR regulator for voltage control, unified control of busbar voltage and power factor balance.
Breaker Logic Control
Relay outputs: Synchronization ready, closing permission, frequency increase / decrease, voltage increase / decrease, reverse power alarm, fault alarm.
Measurement and Diagnosis
Real-time display of voltage, frequency, active / reactive power, power factor; built-in fault self-check, CT open circuit, synchronization timeout alarm.
Electrical Hardware Parameters
1. Power Supply
DC 12/24V wide voltage input (9.5–32 VDC), total machine power consumption < 10W
2. Voltage Collection (PT Signal)
2-phase generator voltage + 2-phase busbar voltage
Optional rated values: 66/115VAC or 230/400VAC, maximum tolerance 300VAC
3. Current Collection (CT Signal)
1-phase generator current, CT secondary 5A input, 3 times range linear measurement
4. Frequency Range
40–70Hz, compatible with 50/60Hz power grid
5. Communication Interface
RS232, RS422 debugging serial port (connected to PC software for parameter calibration)
Modbus RTU, can upload ABB Symphony DCS (TRM01/BIO01 rack) monitoring
6. Output Signals
Analog offset output: 0–10V PWM, provided to governor / AVR to regulate speed and voltage
Multiple isolated relay contacts: alarm, synchronization ready, closing drive
7. Environmental Specifications
Operating temperature: -20℃ ~ +70℃; storage – 40~85℃; humidity ≤ 95% without condensation
Protection IP20, panel embedded cabinet; certification CE, UL/cUL
IV. Panel and Terminal
Front: 2-line × 24-character LCD display + operation keys, for on-site viewing of parameters, modification of parallel set values
Back large terminal block: PT voltage terminals, CT current terminals, 24V power supply, governor / AVR analog output, switch quantity alarm I/O, communication ports
Typical Matching Combinations (Power Plants / Ship Power Stations)
Engine Speed Control: Woodward 505/505E (speed control)
Voltage Regulation: AVR Automatic Voltage Regulator
Parallel Core: 8440-1706 SPM-D11 (synchronization + load sharing)
Upper-level Monitoring: ABB Symphony DCS (TRM01 communication card + BIO01 switch quantity collection)
Application Scenarios
Multi-generator parallel power station for ships
Diesel / Gas Distributed Power Station Thermal power, backup emergency generator control cabinet
Small steam turbine generator parallel system
Series differentiation for pit avoidance
8440-1706: LSXR version, with reactive power / power factor control, wide voltage acquisition, mainstream models on the market
8440-1666: Basic SPM-D11, only synchronous + active power distribution, no complete reactive power regulation
SPM-D21: New generation replacement model, function upgrade, hardware cannot be directly interchanged
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