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3 year warranty

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9905-711 Woodward DSLC for three-phase AC generator. Features Speed Bias of 1–5 Vdc, WYE configuration, 120/240 voltage input, with reduced power functions.



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  • Part Number: 9905-711
  • SKU: 9905711WO
  • Manufacturer: Woodward
  • Series: DSLC Digital Synchronizer and Load Control

9905-711 Technical Specifications

Dimensions H461mm x W265mm x D59mm
Enclosure Type Sheet Metal
Features Wye PT Configuration
Input Voltage 120/240
Manufacturer Woodward
Model DSLC 9905-712
NEMA Rating Indoor Use Only
Operating Temperature -40 to 158 F
Storage Temperature -67 to 221 F
Weight Less than 7lbs. before shipping

Product Description

Manufactured by Woodward, part number 9905-711 is a microprocessor based DSLC Digital Synchronizer and Load Control unit. This model does not have power factor control or process control functions, as it is a reduced upgrade level DSLC part number. It is intended for applications which do not require integrated power factor or process control.

Model number 9905-711 is designed for paralleling, synchronizing, loading, and unloading of three-phase generator sets when used with a Woodward speed control and an automatic voltage regulator (or other compatible device). Built in diagnostics; automatic generator loading and unloading; setup, metering, and diagnostic capability through a handheld programmer terminal; droop, base load, and isochronous load control capability; and reverse power relay are just a few of the available functions.

9905-711 has a 120/240 voltage input and a speed bias of 1-5 Vdc. This WYE PT Configuration unit is rated for 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 9905-711 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

The 9905-711 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 that may be enabled or disabled during setup include:

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

Precautions to protect against static damage should be followed when working with or near the 9905-711. Please consult Woodward DSLC Digital Synchronizer and Load Control Manual 02007, available online, for additional information, product specifications, and safety precautions for Woodward part 9905-711 DSLC. Repairs of part 9905-711 are available through AX Control.

Reviews For 9905-711

Internal Review

For proper operation, it is important that the current transformers be connected correctly. This means that the corresponding phase current transformer and potential transformer must be connected to the same phase terminals on the 9905-711 and that the correct polarity is observed. - AX Control Inc. Tech Team

Repair Services For 9905-711

Type Lead Time Price Action
Repair Service 1-2 weeks $1337

Our highly skilled technicians can repair your 9905-711. 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
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9905-711 Manuals, White Papers, Data Sheets, and Troubleshooting