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3 year warranty

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De-Energize-to-Trip Unit 9907-151 from Woodward ProTech 203 Overspeed Protection. 24Vdc Input, Lockable Enclosure, and a Trip Alarm and LED.



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  • Part Number: 9907-151
  • SKU: 9907151WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9907-151 Technical Specifications

Dimensions W482.6mm x H310.4mm x D142.7mm (with knobs and key)
Input Voltage 220 Vac = 180–264 Vac, 16.4 VA
Keypad/Display (3) LCD 2x16 Characters
Manual 85204
Manufacturer Woodward
Model De-energize-to-Trip
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Standards NEMA 4/4x, IP54
Weight Approc 16 lbs.

Product Description

Part 9907-151 is a 220 Vac overspeed protection device in the ProTech 203 series by Woodward. This is a de-energized-to-trip model that detects overspeed conditions by using magnetic pickups (MPUs) to monitor prime mover speed. If overspeed conditions are detected and confirmed by speed-sensing units by way of a two-out-of-three hardware vote, a trip relay is activated.

ProTech model 9907-151 has both visual and audible alarms to indicate a trip. These include LED indicators, an alarm output, and an error code on the unit’s LCD display. Possible causes of a trip include:

  • Present Speed of a unit exceeds the Trip Set Point value
  • Internal hardware problem
  • An overspeed test brought the Present Speed above the Trip Set Point
  • MPU failure, such as a sudden loss of speed
  • Disconnected internal cable
  • Loss of MPU signal
  • MPU Fail Timeout

Parameters such as Trip Set Point and MPU Fail Timeout can be set when the units are in PROGRAM mode, which can only be accessed by using a single key switch connected to all three speed-sensing units. The enclosure of model 9907-151 meets NEMA 4 and 4X standards for North America, and IP54 for Europe.

Each time a unit trips it must be reset before being brought back online (or the power must be cycled. Units must also be reset before the turbine is started. ProTech model 9907-151 permits resetting units from a remote location through the system’s remote reset feature.

Reviews For 9907-151

Internal Review

Not necessarily due to any system fault, but the build-up of static electricity on your body should be avoided by not wearing clothing made of synthetic materials. Wear cotton or cotton-blend materials as much as possible because these do not store static electric charges as much as synthetics. - AX Control Techs

Repair Services For 9907-151

Type Lead Time Price Action
Repair Service 1-2 weeks $4727

Our highly skilled technicians can repair your 9907-151. 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