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3 year warranty

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9907-147 Woodward ProTech 203 De-Energize-to-Trip Overspeed Protection Systems. Features a 24Vdc Input, CPU and MPU Failure Indication, and a Lockable Enclosure



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  • Part Number: 9907-147
  • SKU: 9907147WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9907-147 Technical Specifications

Dimensions W482.6mm x H310.4mm x D142.7mm
Display Operating Temperature –15 to +60 °C
Features Key Lock
Input Voltage 24 Vdc
Keypad/Display 3 LCDS | 2 Lines of 16 Characters
Manufacturer Woodward ProTech
Model De-energize-to-Trip
Operating Temperature –25 to +60 °C
Weight Less than 17 lbs

Product Description

Model 9907-147 uses magnetic pickups to monitor primer speed for overspeed conditions. Devices in this series are susceptible to electromagnetic interference, vibration, moisture, and temperatures outside of the operating temp range of –25 to +60 °C (–13 to +140 °F). ProTech overspeed protection models should be installed in locations that allow adequate ventilation for cooling, space for servicing, and away from direct sunlight, and away from high-current or high-voltage devices.

This de-energize-to-trip system has a 100 Hz to 32 kHz speed-sensing frequency range and a ±(0.05% x Trip Point in Hz +2 Hz) accuracy rating. Overspeed detection functions are carried out by three individual speed-sensing units, which act independently to monitor speed and perform speed calculations. The three units are in a two-out-of-three vote configuration, so a prime mover trip relay will only occur if overspeed conditions are detected by at least two of the units.

The trip-point frequency range of ProTech overspeed protection model 9907-147 is 250 Hz to 25 kHz. Trip set points are programmed for each of the units separately (they must be programmed identically for accurate outputs) using the operator interfaces. There is one interface per speed-sensing unit. Each one has:

  • Two-line by 16-character LCD display
  • Touchpad
  • Potentiometer
  • LED indicators
  • Alarm output

Programming and testing functions are locked to prevent unauthorized changes. One key switch to move between MONITOR mode and PROGRAM mode is connected to all three units.

Reviews For 9907-147

Internal Review

Every engine, turbine, or other types of prime mover should be equipped with an Overspeed Shutdown Device to protect against runaway or damage to the prime mover with possible personal injury, loss of life, or property damage. - AX Control Tech Teams

Repair Services For 9907-147

Type Lead Time Price Action
Repair Service 1-2 weeks $5446

Our highly skilled technicians can repair your 9907-147. 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