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3 year warranty

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Woodward ProTech 203 Model 9905-997 with an energize-to-trip 220Vac Input, Lockable Enclosure, and Visual and Audible Alarm.



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  • Part Number: 9905-997
  • SKU: 9905997WO
  • Manufacturer: Woodward
  • Series: ProTech 203 Overspeed Protection

9905-997 Technical Specifications

Dimensions W482.6mm x H310.4mm x D142.7mm (with knobs and key)
Display Operating Temperature –15 to +60 °C (+5 to +140 °F)
Features (3) LCD 2x16 Characters
Input Voltage 220 Vac = 180–264 Vac, 7.25W
Manual Woordward 85196
Model Energize-to-Trip
Operating Temperature –25 to +60 °C (–13 to +140 °F)
Standards NEMA 4 for NA, IP54 for EU

Product Description

This overspeed protection system has three speed-sensing units contained in a locked, IP 65 (similar to NEMA 4) certified enclosure with an operator interface for each unit on the front panel. There are three 220 Vac power supplies for this system, one for each unit.

Trip Speed Set Point, Magnetic Pickup (MPU) Failed Set Point, Trip on MPU Failure, MPU Gear Teeth, and MPU Failed Timeout are the tunable parameters set using the LCD and keypad of each operator interface. These parameters can be viewed on the LCD during operation along with Present Speed, Peak Speed, and Trip Cause. Present Speed for each speed-sensing unit is the default first parameter shown on that unit’s LCD.

Units A, B, and C are identical, and all follow the same process for monitoring prime mover speed and performing speed calculations. Speed is sampled every 5 ms using MPUs and after speed calculations are performed, a hardware two-out-of-three vote determines whether overspeed conditions are met.

Any individual unit will trip when its present speed exceeds its Trip Set Point, but only an overspeed detection by at least two of the units will cause a trip relay to take the prime mover offline. This system design also permits hot replacement and testing of individual units while the prime mover is online.

When a unit trips, it remains tripped until it is either reset or the power is cycled. Units must all be reset before the turbine is started, but ProTech model 9905-997 has a remote reset feature to keep this step simple.

Reviews For 9905-997

Internal Review

Avoid the build-up of static electricity on your body by not wearing clothing made of synthetic materials. Wear cotton or cotton-blend materials as much as possible because these do not store static electric charges as much as synthetics - AX Control Inc.

Repair Services For 9905-997

Type Lead Time Price Action
Repair Service 1-2 weeks $4862

Our highly skilled technicians can repair your 9905-997. 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

9905-997 Manuals, White Papers, Data Sheets, and Troubleshooting