Woodward ProTech 203 Electronic Two-out-of-Three Overspeed Protection System
A three-channel digital overspeed trip system using independent speed-sensing units and a hardware two-out-of-three voting arrangement.
Key Information
PROTECH 203 is Woodward’s electronic overspeed protection system for prime movers. Three identical and independent speed-sensing units monitor three magnetic-pickup signals and calculate speed separately.
The three trip-relay paths are arranged for a two-out-of-three hardware vote. A single failed unit can therefore be isolated and replaced while the remaining system continues to provide the intended voting function under the approved procedure.
The family includes different supply-voltage and trip-relay philosophies. A complete enquiry must identify the installed part number and whether the system is de-energize-to-trip or energize-to-trip; the family name alone does not define that selection.
Functions
Monitor three independent speeds
Each unit receives its own magnetic-pickup signal and presents speed and status information on its front panel.
Vote the trip decision
Hardware two-out-of-three relay voting separates a single-channel fault from the final overspeed trip output.
Support on-line testing
The design provides on-line test functions for verifying individual speed channels without treating the test as a complete turbine-system proof.
Permit modular unit service
One failed sensing unit can be replaced while the system is operating when the approved site procedure and remaining protection state permit it.
Specifications
| Manufacturer | Woodward | Exact model | PROTECH 203 |
|---|---|---|---|
| Product type | Digital overspeed trip system | Speed channels | 3 independent units |
| Speed sensors | Three magnetic pickups | Trip logic | Hardware two-out-of-three vote |
| Available trip philosophies | De-energize-to-trip or energize-to-trip | Front indication | Digital speed displays and status LEDs |
| Service feature | Individual unit replacement while operating | Configuration boundary | Part number defines supply and trip execution |
About IndustryParts
https://www.industryparts.com/Overspeed quotations start with the complete system execution
IndustryParts keeps the system part number, trip philosophy, supply record and requested quantity together before proposing ProTech 203 hardware.
- •Exact submitted model retained
- •Installed-system evidence reviewed
- •Requested quantity linked to the enquiry
Installation
Identify the exact system part number
Record the complete Woodward part number and all three unit labels before selecting replacement hardware.
Capture protection settings
Archive overspeed setpoints, MPU characteristics, relay logic and turbine trip interfaces.
Plan channel-by-channel work
Keep two verified protection channels available and follow the approved bypass and test procedure.
Complete the plant proof test
After service, verify all three speed channels, voting behavior, trip relays and the turbine-system shutdown path.
Lifecycle
- Family-level page
- Use this page to identify the ProTech 203 architecture, not to infer the supply voltage of an unlabelled unit.
- Trip philosophy custody
- Keep energize/de-energize selection with the exact system part number and site safety analysis.
- Proof-test record
- Individual on-line tests do not replace the approved full overspeed protection proof test.
FAQ
Why is the complete part number required for a PROTECH 203 quotation?
The family was supplied with different input-power and trip-relay executions, so the ProTech 203 name alone cannot define the correct spare.
Can an energize-to-trip unit replace a de-energize-to-trip PROTECH 203 unit?
No direct substitution should be made because the relay philosophy changes the behavior during power loss and must match the approved protection design.
What magnetic-pickup evidence should accompany PROTECH 203?
Provide all three MPU models, tooth count, expected speed range, wiring records and the installed gap information used by the site procedure.
How is one PROTECH 203 channel serviced without defeating protection?
Use the approved channel bypass and on-line test procedure while confirming the remaining two channels and trip path stay available.
What closes a PROTECH 203 service record?
Verified speed indication on all channels, correct two-out-of-three voting, proven relay outputs and the completed turbine trip test provide acceptance evidence.
Request a model-specific quotation
Send the complete PROTECH 203 label, requested quantity, delivery destination and installed-system context.
