9905-981 Image One
3 year warranty

9905-981 Image 1
9905-981 Image 2
9905-981 Image 3
9905-981 Image 4


    Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.00 (1)
  • Click a star to rate this product
    Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.00 (1)
  • Click a star to rate this product
Energize-to-Trip 9905-981 Unit from Woodward ProTech 203 Series. Displays the actual speed from each speed probe, the highest speed signal, as well as features online/remote testing.



Sell Surplus: Have a 9905-981 to sell? Sell Now
Exchange Credit: Learn more about our exchange credit program
  • Part Number: 9905-981
  • SKU: 9905981WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-981 Technical Specifications

Dimensions W19in x H12.244in x D5.62in (With Knobs and Key)
Display Operating Temperature –15 to +60 °C (+5 to +140 °F)
Features Hot Replacement
Input Voltage 24 Vdc = 18–32 Vdc, 7.25 W
Keypad/Display 2 line x 16 character LCD (3)
Model Energize-to-Trip
NEMA Rating 4x and IP54
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Standards MPU Fail Indication
Weight 13 lbs 1 oz

Product Description

Part 9905-981 is in the ProTech 203 Overspeed Protection System series, manufactured by Woodward. This model is one of the energize-to-trip versions, so a cold-coil monitoring device must be wired in if this system is to meet the API 612 overspeed trip specifications.

Three magnetic pickups (MPUs), one per speed-sensing unit, continually monitor prime mover speed. Each of the units, A, B, and C, actuate two voter relays. The three units are configured so that a two-out-of-three hardware vote determines whether a trip relay is activated. An individual unit will trip if it detects an overspeed condition, but as long as two of the three units are online the system will continue running.

The 9905-981 overspeed protection system is designed for use in locations where an operating temperature range of –25 to +60 °C (–13 to +140 °F) can be maintained, a –15 to +60 °C (+5 to +140 °F) range for the display. This device needs adequate room for ventilation, and it should be protected from vibration, electromagnetic interference, direct sunlight, and moisture.

ProTech 203 manual 85195 has additional location considerations and product specifications. This manual contains in-depth information on 9905-981 features such as hot replacement, built-in self-test, and online testing.

To ensure proper installation and operation requirements and procedures are followed, manuals 82715, 82510, and 50532 should also be reviewed.

Reviews For 9905-981

Internal Review

Whenever two of the three speed-sensing circuits sense an overspeed condition, the voter relay configuration of the 9905-981 will change state, causing a turbine trip. It should be noted, however, that a single MPU or circuit failure will not cause an inadvertent trip. - AX Control Inc. Technician

Repair Services For 9905-981

Type Lead Time Price Action
Repair Service 1-2 weeks $5813

Our highly skilled technicians can repair your 9905-981. 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

9905-981 Manuals, White Papers, Data Sheets, and Troubleshooting