Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.00 (1)
  • Click a star to rate this product
    Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.00 (1)
  • Click a star to rate this product
The 9905-798 is a DSLC part number that will function correctly with the new DSLC part numbers in all functions except dead bus closing. Replacement for 9905-893



3 Year Warranty: Learn More
Sell Surplus: Have a 9905-798 to sell? Sell Now
Exchange Credit: Learn more about our exchange credit program
  • Part Number: 9905-798
  • SKU: 9905798WO
  • Manufacturer: Woodward
  • Series: DSLC Digital Synchronizer and Load Control

9905-798 Technical Specifications

Dimensions H460.65mm x W264.16mm x D58.42mm
Features 500 Hz PWM Speed Bias
Humidity Standard 95% at 100.4 F
Input Voltage 120/240 VAC
Manufacturer Woodward
Operating Temperature -40 to 158 F
Standards Wye PT Configuration
Storage Temperature -67 to 221 F
Weight Less than 7lbs.

Product Description

This model is part number 9905-798, a microprocessor-based Digital Synchronizer and Load Control manufactured by Woodward. This model is designed to be used in the paralleling, synchronizing, loading, and unloading of three-phase AC generator sets. 9905-798 does not have power factor control or process control functions, as it is one of the reduced upgrade level models in this Woodward series.

Woodward's 9905-798 Model has a WYE PT Configuration. It is rated for use in operating temps from –40 to +70 °C (-40 to 158 F) and storage temps from –55 to +105 °C (-67 to 221 F). Additional environmental specifications for the 9905-798 are:

  • Humidity …... 95% at 38 °C
  • Mechanical shock …... US MIL-STD 810C, Method 516.2, Procedures I, II, V
  • Electromagnetic susceptibility …... ANSI/IEEE C37.90.2; ANSI C37.90.1-1989
  • Vibration …... US MIL-STD 167, Type I

Built-in diagnostics; automatic generator loading and unloading; setup, metering, and diagnostic capability through a handheld programmer terminal; droop, baseload, and isochronous load control capability; and reverse power relay are just a few of the available functions.

A few of the load control features of the 9905-798 DSLC include:

  • A frequency trimmer function for accurate frequency control in isochronous load sharing systems
  • Simple load droop operation provides safe operation in parallel bus applications
  • Adjustable load switch output with independent pick-up and drop-out points
  • Load raise and lower inputs to adjust speed before synchronizing
  • Voltage raise and lower inputs to adjust voltage before synchronizing

The 9905-798 offers either phase matching or slip frequency synchronizing. Actual slip frequency and breaker delay values are used to anticipate a minimum phase difference between generator and bus at actual breaker closure for both methods. There is an automatic dead-bus closure function on this control, where only one DSLC control is granted dead-bus closing permission through locking techniques over the communications network.

Additional synchronizer features include:

  • Time-delayed automatic multi-shot reclosing
  • Voltage matching
  • Auto-resynchronizing
  • Synchronizer timeout alarm

These features may be enabled or disabled during setup.

Reviews For 9905-798

Internal Review

The 9905-798 control provides a safe automatic dead-bus closure function. Deadbus closing permission is granted to only one DSLC control through locking techniques done over the communications network. - AX Control Technicians

Repair Services For 9905-798

Type Lead Time Price Action
Repair Service 1-2 weeks $1149

Our highly skilled technicians can repair your 9905-798. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
Learn More