9907-344 Image One
3 year warranty

9907-344 Image 1
9907-344 Image 2
9907-344 Image 3
9907-344 Image 4


    Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.50 (2)
  • 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
  • 4.50 (2)
  • Click a star to rate this product
Model 9907-344 from Woodward displays the actual speed from each speed probe, displays the highest speed signal, as well as online testing with a modular design



Sell Surplus: Have a 9907-344 to sell? Sell Now
Exchange Credit: Learn more about our exchange credit program
  • Part Number: 9907-344
  • SKU: 9907344WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9907-344 Technical Specifications

Dimensions W482.6 x H310.4 x D142.7 (with knobs and key)
Features Key Lock
Input Voltage 24 Vdc = 18–32 Vdc, 5.12 W
Keypad/Display 1 LCD, 12 keys, 1 knob per module
Manual 85205 (F)
Manufacturer Woodward
Model Energize-to-Trip
NEMA Rating 4/4X for NA, IP54 for EU
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Weight 13 lbs 1 oz

Product Description

The speed-sensing units of ProTech model 9907-344 are in an enclosure that meets NEMA 4 and 4X standards for North America, and IP54 for Europe. This enclosure is locked and a key switch controls whether the units are in MONITOR mode or PROGRAM mode. Parameters may be programmed, and units may be tested in PROGRAM mode. MONITOR mode only allows viewing of device tunable parameters, as well as Present Speed and Peak Speed.

Each of the three units actuates two voter relays and is connected in a two-out-of-three-vote configuration. Apart from that, they function independently to monitor prime mover speed. This is done with magnetic pickups (MPUs) that sample prime speed every 5 ms. The speed-sensing frequency range of this model is 100 Hz to 32 kHz.

Woodward ProTech overspeed protection systems are available in both energize-to-trip and de-energize-to-trip models with various power supply configurations. Model 9907-344 is a 24 Vdc (18–32 Vdc, 5.12 W) energize-to-trip system. Other ProTech models are also available from AX Control.

ProTech model 9907-344 units each have an operator interface on the front panel of the enclosure. These include a two-line LCD display, keypad, potentiometer, and both visual and audible alarms. Visual alarms consist of error messages on the LCD and LED indicators. The LEDs indicate issues such as MPU failure, CPU failure, or a tripped alarm. Audible alarm outputs indicate issues that may require attention, such as a tripped unit or an MPU loss of power.

Before starting the turbine and after a trip, units must be reset, which can be done from a remote location through the device’s remote reset function.

Reviews For 9907-344

Internal Review

Whenever two of the three speed-sensing circuits sense an overspeed condition, the voter relay configuration 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 Tech Team

Repair Services For 9907-344

Type Lead Time Price Action
Repair Service 1-2 weeks $5490

Our highly skilled technicians can repair your 9907-344. 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

9907-344 Manuals, White Papers, Data Sheets, and Troubleshooting