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3 year warranty

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Unit 9905-903 from Woodward ProTech 203 Overspeed Protection. 24Vdc Input, Lockable Enclosure, Remote Reset, and CPU/MPU Fail Indication.



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  • Part Number: 9905-903
  • SKU: 9905903WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-903 Technical Specifications

Dimensions W482.6 x H310.4 x D142.7 (with knobs and key)
Display Operating Temperature –15 to +60 °C (5 to 140 °F)
Features Remote Overspeed Test
Input Voltage 24 Vdc
Manual 85201
Manufacturer Woodward
NEMA Rating 4
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Standards for Humidity US MIL-STD-810D, Method 507.2, Procedure II
Weight Approx 7.3Kg

Product Description

This dual relay overspeed protection device has three displays on the front panel, one for each of the three speed-sensing units in the enclosure. Each unit also has its own keypad and functional status LEDs. The internal units are configured for two-out-three hardware voting. The three units within the ProTech 9905-903 dual relay overspeed protection device are programmed individually but must be programmed with identical trip points for proper functioning.

9905-903 units are programmed using the display and keypad on the front panel. PROGRAM mode access is limited to those with key access to the NEMA 4 enclosure. A few of the tunable parameters available with the 9905-903 device are trip speed setpoint, MPU failed setpoint, and MPU failed timeout. A complete list of tunable parameters as well as programming instructions can be found in Woodward ProTech 203 Overspeed Protection System Manual 85201.

There are nine parameters operators can view one at a time on each of the three LCD displays on the 9905-903’s front panel. The current speed for the corresponding speed-sensing unit is the default first parameter shown. These front panel LCDs are also used to display error messages, including MPU FAILED, NO RESET, MPU>TRIP SETPT, and more.

Woodward Manual 85201 has more specifications for the 9905-203 overspeed device as well as location requirements, environmental requirements, etc., but there are a few more manuals Woodward recommends consulting before installing this system. Manuals 82715, 82510, 50532, and 85562 all contain information relevant to the proper handling and operation of this ProTech 203 dual relay model.

Reviews For 9905-903

Internal Review

The 9905-903 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 9905-903

Type Lead Time Price Action
Repair Service 1-2 weeks $5365

Our highly skilled technicians can repair your 9905-903. 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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9905-903 Manuals, White Papers, Data Sheets, and Troubleshooting