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3 year warranty

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The 9907-080 model is part of the ProTech 203 Overspeed Protection units manufactured by Woodward. This model is an Energize-to-Trip in a NEMA 4X enclosure. The voltage range used with this unit is 18-32 VDC because of the nominal power supply of 24 VDC.



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  • Part Number: 9907-080
  • SKU: 9907080WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9907-080 Technical Specifications

Part Number 9907-080
Series ProTech 203 Overspeed Protection
Manufacturer Woodward
Manual 85203
Model Energize-to-Trip
Features Hot Replacement and Key Lock
Standards IP65 and NEMA 4X
Input Voltage 24 Vdc = 18–32 Vdc, 7.25W
Dimensions W482.6 x H310.4 x D142.7 (with knobs and key)
Weight Approx 16 lbs
Operating Temperature –25 to +60 °C (–13 to +140 °F)

Product Description

Model 9907-080 is an Energize-to-Trip model from Woodward. This model was designed to be used in the ProTech 203 Overspeed Protection series. This unit has a locked NEMA 4X enclosure with optional stainless steel hubs. A key switch to control whether the system is in MONITOR mode or PROGRAM mode prevents unauthorized programming or testing of this ProTech 203 system.

Within this enclosure are three identical speed-sensing units that act independently to monitor prime mover speed and perform speed calculations. Continuous monitoring is achieved using magnetic pickups (MPUs) interfaced with each unit. These units are wired in a two-out-of-three voting configuration. The functional status of each of the three units is monitored using the corresponding operator interface, located on the front of the 9907-080 enclosure. This front panel also has six indicator LEDs. There is one LED per relay within the system. In the event one of the relays is tripped, the corresponding LED will turn on.

The relay configuration of ProTech 203 model 9907-080 allows the system to run with at least two of the three speed-sensing units online, enabling such features as testing of independent units without disrupting operations and hot replacement of any single unit.

The present speed of a unit is displayed on the 9907-080 unit’s interface LCD during normal operation. If an overspeed condition is detected and it exceeds the unit's previously recorded peak speed, the record is updated and stored in non-volatile memory. The peak speed record is only updated when an overspeed condition has occurred.

Frequently Asked Questions about 9907-080

What happens when an overspeed is detected on the 9907-080 model?

When an overspeed has been detected on the 9907-080 model, the voter relay configuration will change the state and cause the turbine to trip. Please note that if only one MPU detects an overspeed condition or circuit failure, then a turbine trip will not occur. The allowance of this allows the testing of the voter relays in the system to be a simple operation. 

What are some of the reasons for a hardware fault to occur?

There are several reasons why a hardware fault could occur on the 9907-080; one is if data corruption of the EEPROM is detected. If corruption of the EEPROM is detected, then the display on the model will show that the data has been lost; to easily fix this fault, reset the unit. If the fault continues to occur after resetting the unit, then the unit should be replaced or repaired. Another hardware fault that can occur on this model is a missing interlock signal, when the missing interlock is sensed the unit will trip. If the model trips because of a missing interlock signal all of the cable connections should be checked.

Reviews For 9907-080

Internal Review

One of the excellent features of the 9907-080 model is that it has an MPU fail timer. The MPU fail timer ensures that after a reset operation and the timer starts if the prime mover does not excel to the chosen speed when the timer runs out, a trip will occur to ensure that the user can configure the speed and timer as needed. - AX Control Tech

Repair Services For 9907-080

Type Lead Time Price Action
Repair Service 1-2 weeks $4485

Our highly skilled technicians can repair your 9907-080. 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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