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3 year warranty

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Energize-to-Trip 9905-756 Unit from Woodward ProTech 203 Series. Displays the actual speed from each speed probe, the highest speed signal, as well as featuring online testing with a modular design.



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  • Part Number: 9905-756
  • SKU: 9905756WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-756 Technical Specifications

Dimensions W19in x H12.244in x D5.62in
Display Operating Temperature +5 to +140 °F
Features MPU Fail Option and Timer
Input Voltage 220 Vac = 180–264 Vac, 7.25W
Keypad/Display (3) Display, knob, 12 keys
Manual 85196
Manufacturer Woodward
Model Energize-to-Trip
NEMA Rating 4x and IP54
Operating Temperature –13 to +140 °F
Weight Less than 17 lbs

Product Description

This is an energize-to-trip digital overspeed protection device that utilized three magnetic pickups (MPUs) interfaced with three separate speed-sensing units to continually monitor prime mover speed, sampling prime mover speed every 5 ms. There is a max system response time of 40 ms.

These three units are in a two-out-of-three vote configuration, a hardware vote which occurs after three separate speed calculations have been performed. The 9905-756 system actuates its relay output based on that hardware vote. It is important to note that because this is one of the energize-to-trip models in the ProTech 203, the interposing relay will not actuate if the system loses input power.

The 9905-756 system has all three units enclosed in one, locked enclosure, with access to PROGRAM mode restricted by using a key switch to prevent unauthorized changes or testing. LED indicators on the front panel (one panel per speed-sensing device) provide a quick way to catch when things are not functioning as they should, such as if an MPU has failed, a unit’s CPU is acting up, or a unit has tripped. There are separate LEDs to indicate separate problems, and each speed-sensing unit has its own set of LEDs. Some function errors may also be set to trigger an alarm output when certain conditions are detected.

Woodward ProTech 203 Manual 85196 should be consulted prior to installing the 9905-756 overspeed protection system to ensure all safety precautions are followed and to prevent accidental hardware damage. Additional product specifications can also be found in this manual.

Reviews For 9905-756

Internal Review

Protect the 9905-756 from weather and from extreme humidity or temperature fluctuations during storage. Approved for use in Type 4 and 4x environments for North America. Enclosure rated IP54 for Europe. - AX Control Inc.

Repair Services For 9905-756

Type Lead Time Price Action
Repair Service 1-2 weeks $5020

Our highly skilled technicians can repair your 9905-756. 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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9905-756 Manuals, White Papers, Data Sheets, and Troubleshooting