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Home Woodward ProTech 203 Overspeed Protection 9905-990

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About | Product Specifications | FAQs

9905-990

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Woodward Protech 203 Overspeed Protection Model 9905-990 was designed as a De-Energize-to-Trip Model to operate on a power supply of 120 Vac/dc. This model is used to read magnetic pickups, and perform speed calculations.
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  • Part Number: 9905-990
  • SKU: WO-56876
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-990 Technical Specifications

Part Number 9905-990
Series ProTech 203 Overspeed Protection
Manufacturer Woodward
Model De-Energize-to-Trip
Manual Product Manual 85196
Features CPU Failure Indication
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Display Operating Temperature –15 to +60 °C (+5 to +140 °F)
Dimensions W19in x H12.244in x D5.62in
Weight Approx 14 lbs
Input Voltage 120 Vac/dc = 88–132 Vac/90–150Vdc, 7.25W
Standards NEMA 4/4x, IP54

About the 9905-990

The 9905-990 unit was produced by Woodward Incorporated for their ProTech 203 Overspeed Protection System series. There are two different model types in the Protech series, Energize-to-Trip, and De-Energize-to-Trip; the 9905-990 model was designed as a De-Energize-to-Trip Model. De-Energize-to-Trip models are the safest to use as they will ensure that if the attached prime mover experiences a loss of power it will trip the unit.

Model 9905-990 has several features that make it an efficient choice of overspeed protection device. These three units, A, B, and C, are identical speed-sensing units that can be tested or even replaced individually. ProTech model 9905-990 uses a two-out-of-three hardware voting configuration so the overall system can remain in operation with at least two units online.

Before the hardware voting relay, the three units act independently to monitor prime mover speed (sampled every 5 ms) using magnetic pickups (MPUs) and perform a speed calculation. A trip relay is activated if an overspeed condition is met. The total response time of this process is a maximum of 40 ms.

The 9905-990 device has a speed-sensing frequency range of 100 Hz to 32 kHz and a trip-point frequency range of 250 Hz to 25 kHz. This system has an accuracy rating of 0.05% of point + 2 Hz over the operating temperature and should be installed in a location where it is protected from things, such as electromagnetic interference and vibration, in a space where there is adequate ventilation for cooling.

For more information on the functions and hardware configurations of the 9905-990 model, refer to the attached Woodward Manual 85196.

Frequently Asked Questions about 9905-990

What are some of the specifications that come with a 9905-990 model, and what are their functions?

Some specifications of the 9905-990 model are hot replacement, remote reset, CPU failure indication, and speed-sensing frequency range. The function of the CPU failure indication will ensure that a separate LED will indicate if any of the 9905-990's CPUs are not performing up to standard. The hot replacement specification on the 9905-990 model makes replacement of the unit easier as it can be replaced with the device running without causing a trip to occur. The remote reset allows this unit to be reset in a remote location. The speed-sensing frequency range specification is 100 Hz to 32 kHz. More specifications and their functions will be found on pages seven through nine of the 85196 Manual. 

This model can run in two modes; what is the most preferred mode?

The two modes are monitor and program; the preferred mode to operate the 9905-990 model is monitor mode. While the 9905-990 unit will run in the program mode it is more commonly used when configuring the model to its preferred specifications. 

Reviews For 9905-990

Internal Review
(5.0)

Any of the De-Energize-to-Trip models, such as the 9905-990 model are superior to Energize-to-Trip models because it will ensure that to keep the operator and the unit itself safe if a power loss occurs the unit will initiate a trip. Models that do not initiate a trip can cause personal injury and damage to the 9905-990 unit and prime mover. - AX Control Tech

Repair Services For 9905-990

Type Lead Time Price Action
Repair Service 1-2 weeks $4074

Our highly skilled technicians can repair your 9905-990. 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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9905-990 Manuals, White Papers, Data Sheets, and Troubleshooting