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The 9905-976 is a safety-critical overspeed protection system from the ProTech 203 series developed by Woodward, Inc.. It is designed to protect high-speed rotating machinery such as steam turbines, gas turbines, and...
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The 9905-976 is a safety-critical overspeed protection system from the ProTech 203 series developed by Woodward, Inc.. It is designed to protect high-speed rotating machinery such as steam turbines, gas turbines, and large reciprocating engines from catastrophic overspeed conditions.
The module uses triple-modular redundant (TMR) voting logic to provide high-reliability safety shutdown decisions. When a preset speed threshold is exceeded, the system triggers emergency shutdown outputs within milliseconds to protect mechanical components and downstream processes.
It replaces traditional mechanical trip mechanisms with electronic sensing using magnetic pickup or proximity probe signals, filtering noise and transient disturbances to avoid nuisance trips. The ruggedized design allows installation near prime movers in harsh industrial environments.
| Parameter | Specification |
|---|---|
| Model | 9905-976 |
| Function | Overspeed protection & safety shutdown logic |
| Input Voltage | 24 V DC nominal |
| Speed Sensing Inputs | MPU sensors / active proximity probes |
| Operating Speed Range | Programmable based on application |
| Safety Outputs | Heavy-duty relay outputs (Alarm / ESD) |
| Communication Protocols | Modbus RTU; Ethernet expansion supported |
| Housing | Vibration-resistant industrial enclosure |
| Mounting | DIN rail or rear-panel mounting |
| Operating Temperature | –40°C to +70°C |
| Weight | 1.1 kg |
| Dimensions | 120 × 100 × 60 mm |
Power generation turbine protection
Petrochemical and refinery compressor protection
Boiler feed pump overspeed monitoring
Critical rotating equipment safety systems
Can the system be tested while the turbine is running?
Yes. The ProTech 203 platform supports channel-level testing and speed simulation without requiring full shutdown.
What if the speed sensor fails?
The module includes sensor diagnostics and can be configured to trigger alarm or safe shutdown on signal loss.
Trip response speed?
Trip logic and relay actuation occur within milliseconds, significantly faster than mechanical overspeed protection systems.
