9905-879

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De-energize-to-Trip Woodward ProTech 203 Model 9905-879 with speed-sensing units for monitoring prime mover speed and activating trip relays

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  • Part Number: 9905-879
  • SKU: 9905879WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-879

    Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures Varying star amount pictures
  • 4.00 (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
  • 4.00 (2)
  • Click a star to rate this product
De-energize-to-Trip Woodward ProTech 203 Model 9905-879 with speed-sensing units for monitoring prime mover speed and activating trip relays

AVAILABILITY:

CALL FOR AVAILABILITY

3 Year Warranty: Learn More
Sell Surplus: Have a 9905-879 to sell? Sell Now
Exchange Credit: Learn more about our exchange credit program
  • Part Number: 9905-879
  • SKU: 9905879WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-879 Technical Specifications

Dimensions W482.6mm x H310.4mm x D142.7mm
Features MPU Fail Option and Timer
Input Voltage 120 Vac/dc = 88–132 Vac/90–150Vdc, 7.25W
Keypad/Display LCD, Keypad, and Frequency Knob (3)
Manual Woodward 85191
Model De-energize-to-Trip
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Standards NEMA 4/4x, IP54

Product Description

Two-out-of-three voting, a hot replacement feature, and a built-in self-test feature provide continuous, reliable overspeed protection from this ProTech 203 model. As long as two of the three 9905-879 speed-sensing units are operational, the prime mover can stay online. Two units will still provide an accurate output.

 

This output is the result of a two-out-of-three vote based on the calculations of each of the three units, each with its own magnetic pickup (MPU). A trip relay is activated if overspeed conditions are detected. A single tripped unit will not inadvertently cause a turbine trip. Several conditions may be to blame for a tripped unit, such as MPU or CPU failure, and manual 85191(version B) should be consulted for a comprehensive troubleshooting guide.

 

Model 9905-879 is one of the de-energize-to-trip models in this Woodward overspeed protection system series. This is one of the models with a 120 Vac/dc power supply for each of the system’s three speed-sensing units. The speed-sensing frequency range of model 9905-879 is 100 Hz to 32 kHz, and the trip-point frequency range is 250 Hz to 25 kHz.

 

The speed-sensing units of ProTech 203 model 9905-879 are all in a single closure. If the optional stainless steel hubs are used, the enclosure meets NEMA 4X certification standards.

Reviews For 9905-879
Internal Review

Whenever two of the three speed-sensing circuits in the 9905-879 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 Techs

Repair Services For 9905-879

Type Lead Time Price Action
Repair Service 1-2 weeks $5309

Our highly skilled technicians can repair your 9905-879. 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

9905-879 Manuals, White Papers, Data Sheets, and Troubleshooting