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3 year warranty

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The Woodward ProTech 203 electronic two-out-of-three Overspeed Protection System 9905-982. Features a 24Vdc Input, CPU and MPU Failure Indication, and a Lockable Enclosure



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  • Part Number: 9905-982
  • SKU: 9905982WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-982 Technical Specifications

Dimensions W482.6 x H310.4 x D142.7 mm (W19 x H12.244 x D5.62 in)
Features Key Lock
Input Voltage 120 Vac/dc
Keypad/Display 36 key, 3 knobs, 3 displays
Manual 85195
Manufacturer Woodward
NEMA Rating 4x for NA, IP54 for EU
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Standards Adequate ventilation for cooling
Weight No more than 17 lbs

Product Description

Woodward ProTech 203 model 9905-982 has three identical speed-sensing units, all enclosed in a single, locked enclosure. If the optional stainless steel hubs are used, this enclosure is NEMA 4X certified. Each of the units comes with its own 120 Vac/dc power supply.

9905-982 is an energized-to-trip model, meaning during normal operation, the voter relays are in the de-energized state. To meet API 612 overspeed trip specifications, a cold-coil monitoring device must be wired into this system.

There are three magnetic pickups (MPUs), each one interfaced with a different speed-sensing unit. Units A, B, and C perform separate speed calculations, then together perform a two-out-of-three hardware vote. If an overspeed condition is detected by one unit, that unit is tripped and operations will continue. If two units detect an overspeed condition, a trip relay is activated in the system, and operations are shut down.

Because model 9905-982 has a modular design and a two-out-of-three voting configuration, several features to reduce system downtime are available. One of these features is hot replacement. If any individual speed-sensing unit needs to be replaced, it can be swapped out without taking the prime mover offline. In this scenario, the two units remaining online will maintain control of the system and continue to provide an accurate output. Similarly, individual units may be tested while the system is online.

Reviews For 9905-982

Internal Review

Immediately after a reset operation, an MPU Fail Timer starts. If 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 Techs

Repair Services For 9905-982

Type Lead Time Price Action
Repair Service 1-2 weeks $5852

Our highly skilled technicians can repair your 9905-982. 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

9905-982 Manuals, White Papers, Data Sheets, and Troubleshooting