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3 year warranty

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Manufactured as a De-Energize-to-Trip Module, the 9905-985 is part of the ProTech 203 Overspeed Protection Series from Woodward Inc. The standard power supply for this model is 120 VAC/DC. The voltage ranges for this model are 88-132 VAC ad 90-150 VDC.



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  • Part Number: 9905-985
  • SKU: 9905985WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-985 Technical Specifications

Part Number 9905-985
Series ProTech 203 Overspeed Protection
Manufacturer Woodward
Manual Woodward Manual 85195
Model De-Energize-to-Trip
Features CPU Failure Indication
Keypad/Display (3) 12-button Keypad (wit knob) and LCD
Operating Display Temperature +5 to +140 °F
Operating Temperature –13 to +140 °F
Dimensions W19in x H12.244in x D5.62in
Weight 16 lbs
Input Voltage 120 Vac/dc = 88–132 Vac, 90–150Vdc, 7.25W

Product Description

Model 9905-985 is a De-Energize-to-Trip model produced by Woodward for the ProTech 203 Overspeed Protection models. It has three 120 Vac/dc power supplies, one for each of the three speed-sensing units. There are two voltage ranges associated with this model due to the 120 Vac/dc power supply. The two voltage ranges are 88-132 for Vac and 90-150 for Vdc. The wattage associated with the 9905-985 model is approximately 7.25 W.

Along with individual power supplies, each of these speed-sensing units also has its operator interface. Units A, B, and C are identical, though they are programmed individually (identical programming is necessary for the correct and safe operation of this system). The units are programmed using the two-line LCD and touchpad on its corresponding interface.

To switch between MONITOR and PROGRAM modes on the 9905-985 unit, users must use a key to unlock the enclosure. When the optional stainless steel hubs are used, this enclosure is NEMA 4X certified. Tunable parameters and programming instructions are thoroughly outlined in Woodward’s ProTech 203 manual 85195. This manual also has information on features of model 9905-985, such as hot replacement, the built-in self-test, remote reset, and available functional status indicators and alarm outputs.

Manual 85195 also contains basic location considerations that must be taken into account before installing the ProTech 203 9905-985 model. This overspeed protection device is sensitive to many factors, like vibration, heat, and moisture, and a proper location is necessary to ensure the safe and accurate operation of this device.

Frequently Asked Questions about 9905-985

How do you initially start the 9905-985 model?

To initially start up the 9905-985 model, each of the three units has to be reset prior to starting the attached turbine. To reset the units, press the reset button on the front panel or temporarily close the remote reset contact. Once the power-up has completed a self-test each of the ProTech will execute the speed sensing algorithm. 

During the operation of the 9905-985, what should I do if an inappropriate trip occurs during the start-up?

If an inappropriate trip occurs during start-up, there are several causes for this inconvenient trip. One example is that the set point values that have been configured for one or more of the units are incorrect. To fix this issue, ensure that the attached turbine is not ramping to the configured speed in the allotted time. The user should check that the MPU fail timeout and MPU fail setpoint are both configured to the appropriate setting for the turbine.

The LCD on my 9905-985 was previously working and is no longer operating; what should I do?

If your LCDs were previously working on the 9905-985 model were previously working check to make sure that the unit has power, often the LCD will not work because no power has been supplied; if power is provided and the LCDs are still not working, check the power supply fuses. The power supply fuses can malfunction and will then need to be replaced.

Reviews For 9905-985

Internal Review

There are several different tunable parameters with a variety of different ranges depending on how the user wishes to operate the 9905-985 unit. One of the parameters is MPU failed set point with the allowable range on this parameter being 100 rpm to 25,000 rpm. For more parameter and their ranges refer to page thirteen in the 85195 Manual. - AX Control Tech

Repair Services For 9905-985

Type Lead Time Price Action
Repair Service 1-2 weeks $5423

Our highly skilled technicians can repair your 9905-985. 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
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9905-985 Manuals, White Papers, Data Sheets, and Troubleshooting