Woodward SPM-D11 8440-1666/E Load Distribution Controller

Woodward SPM-D11 8440-1666/E Load Distribution Controller

Woodward 8440-1666/E belongs to the SPM-D11 series generator automatic synchronization and load distribution controller. A cabinet mounted panel controller is used for diesel and gas generator sets to achieve automatic synchronous closing, phase/frequency/voltage matching, and load sharing management between multiple generators and between generators and the power grid.

main function

Automatically detect the voltage, frequency, and phase difference between the generator and the bus, complete automatic synchronization, control the circuit breaker to close, and achieve safe grid connection/parallel operation of the generator set.
Implement active and reactive load distribution among multiple units to avoid single machine overload or load drift.
Provide protection interlocks for synchronization failure, voltage abnormality, frequency abnormality, etc., to prevent damage to the generator caused by asynchronous closing
Display the electrical parameters of the unit locally, and output communication and switch signals externally. Connect with DCS and PLC upper monitoring systems to support remote monitoring of the unit’s parallel status.

Woodward SPM-D11 8440-1666/E Load Distribution Controller

Item	Specification
Model	8440‑1666/E (SPM‑D11)
Power Supply	18‑36 V DC
Nominal System Voltage	100‑480 V AC (3‑phase)
Nominal Frequency	50 / 60 Hz selectable
Synchronizing Mode	Auto / Manual synchronizing
Load Sharing	Active & reactive load sharing
Display	2‑line LCD display with LED status indicators
Digital Inputs	Configurable binary inputs
Relay Outputs	Form‑C potential‑free relay contacts
Communication Interface	RS485, Modbus RTU
Front Panel Protection	IP42
Rear Terminal Protection	IP24
Operating Temperature	-40 ℃ ~ +70 ℃
Dimensions	144 mm × 72 mm × 122 mm
Mounting	Panel cut‑out mounting
Weight	Approx. 0.8 kg

Product features

Fully automatic synchronous closing: automatically tracks voltage, frequency, and phase, and outputs closing instructions when synchronization conditions are met; Simultaneously retaining manual synchronization mode for easy debugging and maintenance.
Active and reactive load sharing: When multiple units are running in parallel, active and reactive loads are automatically allocated to suppress load offset and ensure the stability of the parallel system.
Improve synchronous protection logic: equipped with asynchronous locking, voltage over limit, frequency over limit protection, and prohibit closing when conditions are not met to protect the generator and switchgear equipment.
Panel LCD+LED status indication: Two rows of LCD display real-time voltage, frequency, and phase difference on both sides; The LED indicator light provides intuitive feedback on the closing, fault, and synchronization status, allowing for local troubleshooting.
Standard communication interface: RS485 Modbus RTU, which can be connected to DCS and PLC to achieve remote parameter reading, alarm, and status monitoring.
Panel opening installation: Cabinet panel embedded installation, front panel IP42 protection, rear terminal IP24, suitable for industrial environments with high dust and strong electromagnetic interference in power plant control cabinets.
Parameter software configuration: The synchronization threshold, load distribution coefficient, and protection threshold can be modified through the upper configuration software to adapt to different power generator sets.
Wide voltage DC power supply: 18-36VDC power supply, suitable for industrial battery power supply system, wide temperature operation from -40 ℃ to+70 ℃, strong anti vibration and anti electromagnetic interference ability.

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