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9905-885 Woodward ProTech 203 consists of three identical, independent, speed-sensing units which continuously monitor prime mover speed and activate a trip relay



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  • Part Number: 9905-885
  • SKU: 9905885WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-885 Technical Specifications

Dimensions W19 x H12.24 x D5.62(in)
Features MPU and CPU Failure Indication
Input Voltage 120 Vac/dc = 88–132 Vac/90–150Vdc, 7.25W
Keypad/Display 1 Keypad, Knob, Display per Module
Manual Woodward 85191
Model Energize-to-Trip
Operating Temperature –13 to +140 °F
Standards NEMA 4x, IP54
Weight Less than 20 pounds before packaging

Product Description

ProTech 203 models 9905-885 is an overspeed protection system in a NEMA 4X standard enclosure (if optional stainless steel hubs are used). This device uses magnetic pickups (MPUs) to detect overspeed conditions and activate a trip relay if conditions are met. The 9905-885 model is an energize-to-trip model of three identical speed-sensing units.

This model boasts a speed sample time of 5ms, with a total response time of only 40 ms. It has a speed-sensing frequency range of 100 Hz to 32 kHz. The ProTech 203 model 9905-885 has an accuracy rating of 0.1% (at 25 °C).

When a trip relay occurs, it is indicated by both an alarm output and an LED on the front of the tripped speed-sensing unit. The two-out-of-three vote configuration of the units means that if only one unit trips, the system can continue operating. If two units trip, the system will stop operations. The 9905-885 system has a trip-point frequency range of 250 Hz to 25 kHz.

There are three operator interfaces on the front of the 9905-885 system, one for each unit inside. These interfaces have a two-line LCD, a keypad, and their own set of LED functional status indicators. The LCD can display the present speed, the peak speed, the trip speed set-point, and the trip cause, among other parameters.

Additional features of model 9905-885 that make it a good choice for overspeed protection applications include:

  • Hot replacement
  • Built-in self-test
  • Remote reset
  • MPU failure indicator
  • CPU failure indicator

A complete list of parameters that can be displayed as well as additional features of model 9905-885 may be found in ProTech 203 Manual 85191 (version B).

Reviews For 9905-885

Internal Review

Depending on how the 9905-885 is configured, this input can act as a remote start input, or as an indication to the ProTech system that it should be sensing a speed greater than the MPU fail set point. - AX Control Tech Team

Repair Services For 9905-885

Type Lead Time Price Action
Repair Service 1-2 weeks $5335

Our highly skilled technicians can repair your 9905-885. 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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9905-885 Manuals, White Papers, Data Sheets, and Troubleshooting