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Woodward 9906-718

Product Introduction:​ Industrial-grade programmable digital speed-governing hardware unit developed for reciprocating internal combustion engine generator sets. Ships with specific application firmware preloaded for engine speed regulation, generator load distribution, and grid-synchronization logic processing. Interfaces externally with magnetic pulse speed sensors, actuators, transmitters, and discrete signals to achieve closed-loop engine speed control. Belongs to the 723PLUS family low-voltage power supply variant with LON load-sharing communication capability.

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Detailed content

Technical Specifications:
  • Power supply: DC 18–40 V, nominal 24 V / 32 V
  • Overall power consumption: rated 40 W
  • Speed input: 2 channels magnetic pulse MPU speed input, input voltage 1–50 Vrms, frequency 30 Hz–15 kHz
  • Analog input: 4 channels, supports ±5 V DC, 0–20 mA signals, full-scale accuracy 0.5%
  • Analog output: 3 channels for driving actuators and outputting condition signals
  • Discrete input: 8 channels 24 V DC switching input
  • Discrete output: 3 channels relay switching output
  • Communication interface: 3 channels 9-pin D-SUB serial ports, supports Modbus-RTU and LON LonTalk load-sharing bus
  • Operating temperature: −40 °C to +70 °C
  • Storage temperature: −55 °C to +105 °C
Functional Features:
  • Is speed / droop speed regulation modes, soft load / soft unload functions
  • Built-in multi-unit load sharing logic, supports LON bus multi-machine parallel operation
  • Start fuel limiting, boost pressure fuel limiting, load rejection protection
  • All I/O channels software configurable with customizable signal allocation
  • Supports handheld programmer and Servlink software for parameter commissioning and online monitoring
  • I/O signal test, forced output debugging, fault alarm status recording
Application Scenarios:​ Diesel engines, gas engines, dual-fuel engine driven generator sets; factory backup power supplies, marine auxiliary generator sets, industrial distributed power stations, oilfield power units.
Performance Parameters:​ Steady-state speed control accuracy ±0.25% of rated speed; dynamic PID parameters software adjustable; analog input common-mode voltage tolerance ±40 V, common-mode rejection 0.5% FS.
Material Composition:​ Sheet metal stamped housing, internal FR-4 industrial printed circuit board; onboard solid capacitors, power resistors, communication chips, microprocessor; terminal blocks made of flame-retardant nylon, D-SUB connectors with metal shielding housing.
Structural Features:​ Integrated single-board controller, metal chassis encapsulation; 3 groups of terminal blocks, 3 DB9 communication interfaces; rack panel-mount installation, housing with reserved mounting holes; panel status indicators for run, alarm, and communication status.

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