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3 year warranty

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9905-999 Woodward ProTech 203 consists of three identical, independent, speed-sensing units which continuously monitor prime mover speed and activate a trip relay when an overspeed condition is detected.



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  • Part Number: 9905-999
  • SKU: 9905999WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-999 Technical Specifications

Dimensions W482.6mm x H310.4mm x D142.7mm
Features MPU Fail Indication
Input Voltage 120 Vac/dc = 88–132 Vac/90–150Vdc, 7.25W
Keypad/Display 3 Keypads and Displays
Manual 85196
Manufacturer Woodward
Model De-energize-to-Trip
NEMA Rating 4x and IP54
Operating Temperature –25 to +60 °C
Standards Adequate ventilation for cooling
Weight Over 13 lbs

Product Description

Product model 9905-999 is a 120 Vac/dc overspeed protection device. This is a Woodward ProTech de-energize-to-trip model that determines trip relay state by way of a two-out-of-three vote performed by this model’s three speed-sensing units. These units monitor prime mover speed with magnetic pickups (MPUs).

This overspeed protection system has a trip-point frequency range of 250 Hz to 25 kHz. The speed-sensing frequency range is 100 Hz to 32 kHz.

Units are programmed using the three operator interfaces on the front panel of model 9905-999. There is one interface per speed-sensing unit, each one with its own LCD, keypad, LED indicators, and potentiometer knob.

The three units within the model 9905-999 system are identical. They are connected in a two-out-of-three voting configuration, meaning it takes an overspeed detection from at least two of the units to prompt a trip relay to take operations offline. Any unit will trip if it detects an overspeed condition, but no single unit will trip the entire system.

A benefit to this design is that this overspeed protection device can handle hot replacement of an individual unit. As long as the other two are online and properly functioning, the system will remain online and provide an accurate output. This also permits the built-in self-test feature, since model 9905-999 will operate with two units in control.

For full feature information, please refer to Woodward ProTech 203 Overspeed Protection System manual 85196.

Reviews For 9905-999

Internal Review

Immediately after a reset operation of the 9905-999, an MPU Fail Timer starts. If the prime mover speed is not up to the value programmed when this timer times out, the device will trip the prime mover. Both the time and the speed are programmable. - AX Control Technicians

Repair Services For 9905-999

Type Lead Time Price Action
Repair Service 1-2 weeks $4943

Our highly skilled technicians can repair your 9905-999. 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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9905-999 Manuals, White Papers, Data Sheets, and Troubleshooting