WOODWARD | 9907-838 | 24 VDC Load Sharing Module

Description

Product Technical Parameters

• Brand: WOODWARD
• Model: 9907-838 (Replaced obsolete model 9907-175)
• Series: LSM (Load Sharing Module) Series
• Product Name: 24 VDC Load Sharing and Speed Control Module
• Country of Origin: USA
• Condition Status: Industrial Factory Original / Brand New In-Stock
• Dimensions: Approx. 273.6 mm x 214.1 mm x 59.2 mm (10.77 in x 8.43 in x 2.33 in)
• Weight: Approximately 1.36 kg to 1.4 kg (approx. 3 lbs)
• Power Supply / Rating: 18 to 32 VDC auxiliary DC power input (24 VDC nominal)

⚙️ Operation Specifications and Usage Methods

• Installation Preparation: Ensure all power sources to the generator control panel are completely locked out. Mount the modular chassis securely inside an industrial control cabinet, observing standard electrostatic discharge (ESD) precautions.
• Parameter Configuration: Wire the 18 to 32 VDC power supply and configure the unit specifically to interface with engines (such as Caterpillar models) equipped with pulse-width modulated (PWM) digital speed control inputs.
• Operational Control: Use the module to integrate Woodward power generation accessories and achieve balanced isochronous or droop load sharing between non-Woodward digital speed control engines and standard Woodward-equipped generator sets.

⚡ Startup and Shutdown Sequence

• Startup Sequence:
  1. Inspect all terminal wiring, ensuring proper shielding and secure connections across the DC power input, PT sensing lines, and PWM output leads.
  2. Energize the 24 VDC auxiliary power supply and verify that the module initializes cleanly without internal faults.
  3. Start the prime mover and bring the generator up to rated operating speed and nominal voltage.
  4. Engage the parallel control mode to allow the LSM module to actively regulate speed/load via the specialized PWM output.
• Shutdown Sequence:
  1. Transfer active electrical load away from the generator unit using manual or automated base-load shedding.
  2. Open the generator circuit breaker to completely decouple the unit from the shared electrical busbar.
  3. Shut down the prime mover engine or turbine according to standard mechanical safety protocols.
  4. De-energize the 24 VDC control power supply and measuring input lines once the system is fully offline.

💡 Product Description

The Woodward 9907-838 is a specialized 24 VDC Load Sharing Module (LSM) engineered primarily for use with Caterpillar engines equipped with digital speed controls utilizing a pulse-width modulated (PWM) input. Serving as the official replacement for the obsolete 9907-175, it enables seamless isochronous and droop load sharing across mixed-engine fleets combining Woodward accessories with non-Woodward electronic controls.

❓ Frequently Asked Questions (Q&A)

• Q: What specific engine compatibility is the 9907-838 designed for?
  • A: It is specifically tailored for engines—such as Caterpillar models—equipped with digital speed controls that require a pulse-width modulated (PWM) input.
• Q: What auxiliary power supply does this module require?
  • A: It operates on an auxiliary DC voltage input ranging from 18 to 32 VDC (24 VDC nominal).
• Q: Which older obsolete part number does the 9907-838 replace?
  • A: It serves as the direct upgraded replacement model for the obsolete Woodward 9907-175 load sharing module