9905-872

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9905-872 Woodward ProTech 203 consists of three identical, independent, speed-sensing units which continuously monitor prime mover speed and activate a trip relay when an overspeed condition is detected.

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  • Part Number: 9905-872
  • SKU: 9905872WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-872

    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
9905-872 Woodward ProTech 203 consists of three identical, independent, speed-sensing units which continuously monitor prime mover speed and activate a trip relay when an overspeed condition is detected.

AVAILABILITY:

CALL FOR AVAILABILITY

3 Year Warranty: Learn More
Sell Surplus: Have a 9905-872 to sell? Sell Now
Exchange Credit: Learn more about our exchange credit program
  • Part Number: 9905-872
  • SKU: 9905872WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-872 Technical Specifications

Dimensions W19in x H12.244in x D5.62in
Features Remote Reset
Input Voltage 24 Vdc, 24 Vdc, 120 Vac/dc
Keypad/Display 1 Keypad, Knob, Display per Module
Manual 85191
Manufacturer Woodward
Model De-energize-to-Trip
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Weight 7Kg

Product Description

Woodward model 9905-872 is an overspeed protection system that continually monitors for overspeed conditions. This model is comprised of three separate speed-sensing units, all fitting together inside one, locked IP65-certified enclosure. The 9905-872 speed-sensing units are each interfaced with a magnetic pickup (MPU) and each performs its own speed calculations. These calculations are put to a two-out-of-three hardware vote.

 

Like other overspeed protection devices in this ProTech 203 series, each speed-sensing unit has its own power supply. In the 9905-872 system, Unit A and Unit B are 24 Vdc, while Unit C is 120 Vac/dc. Model 9905-872 is a de-energize-to-trip version. This model samples prime mover speed every 5 ms and has a max overall system response time of 40 ms.

 

The three-unit design and two-out-of-three voting configuration minimize overall system downtime in a few ways:

  • The prime mover can remain online if a single unit is tripped
  • The prime mover can remain online during the testing of individual units
  • Speed-sensing units can be replaced while the prime mover is online

Details on how this works can be found in Woodward ProTech 203 Overspeed Protection System Manual 85191 (version B).

 

Additional features of the ProTech 203 99050872 model include LED indicators for a failed MPU, an incorrectly functioning CPU, and a tripped speed-sensing unit (there is also an alarm output for a tripped unit); a key lock for the enclosure; and remote reset.

Reviews For 9905-872
Internal Review

The 9905-872 can be operated in one of two modes: MONITOR or PROGRAM. Although the system will “run” in either mode, it is recommended that the unit be placed in the PROGRAM mode only during configuration and then placed in the MONITOR mode during normal operation. - AX Tech

Repair Services For 9905-872

Type Lead Time Price Action
Repair Service 1-2 weeks $5028

Our highly skilled technicians can repair your 9905-872. 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.
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All Motors: 1 Year
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9905-872 Manuals, White Papers, Data Sheets, and Troubleshooting