The Woodward ProTech-SX is an IEC 61508 SIL-2 certified safety PLC with integrated overspeed protection. Designed for small engines, steam, gas, and hydro turbines, and general plant safety applications, it combines a 12 millisecond response time with programmable logic, first-out trip indication, and valve health monitoring in a cost-effective single-unit package.
Key Features
Protection & Control
- IEC 61508 SIL-2 certified safety device
- 12 millisecond total response time
- Speed range: 0.5 to 32,000 rpm
- Integrated overspeed and acceleration detection
- 2 speed inputs and 7 discrete/analog inputs
- 5 fast-acting configurable relay outputs
- 4–20 mA speed meter output
- Programmable safety logic via configuration software
Diagnostics & Integration
- First-out trip indication for rapid troubleshooting
- Alarm and trip logs
- Valve response monitoring
- Programmable auto-test routines
- Modbus serial communications
- Optional Ethernet gateway for plant DCS integration
- Flush-mount panel installation (IP56 rated)
- Dual power inputs with high-signal-select operation
Applications
- Small engine overspeed protection
- Steam, gas, and hydro turbine safety systems
- Stand-alone plant safety device for any process equipment
- Cost-effective programmable speed switch (four configurable relays)
- Valve health monitoring
- IEC 61508 / IEC 61511 safety system component
Drake Controls Services
Drake Controls is a Woodward Authorized Distributor. We supply ProTech-SX units and provide configuration, commissioning, and repair for turbine and engine safety applications.