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ProTech TPS (Safety PLC with Integrated Overspeed Protection)

ProTech TPS (Safety PLC with Integrated Overspeed Protection)

ProTech TPS (Safety PLC with Integrated Overspeed Protection)


The ProTechTPS safety system is designed to be applied as a safety system for any size steam, gas, or hydro turbine, or plant process equipment. This safety PLC’s fast (12 millisecond) response time, 0.5 to 32 000 rpm speed range, and integrated overspeed and acceleration detection/protection functionality, make it ideal for application on critical highspeed rotating motors, compressor, turbines or engines.

Alternatively, this stand-alone safety device can be configured to protect any plant system or device, and report the system’s/ device’s status to the plant DCS. The ProTechTPS’s versatile inputs, outputs, programming environment, and communications make it ideal as a safety protection device for use in small applications that could possibly reach an unsafe state or condition and that must communicate directly to the plant DCS.

The ProTechTPS is designed for critical applications where both personnel safety and unit availability (operation run time) is a concern or necessity. Certified as an IEC61508 SIL-3 (Safety Integrity Level 3) safety device, the ProTechTPS can easily be applied as a stand-alone IEC61508-based device or within an IEC61511-based plant safety system. A thorough product manual is provided to instruct users on how to apply the ProTechTPS to meet IEC based requirements.

The ProTechTPS’s triple modular voting architecture, first-out trip indication, alarm, trip & overspeed logs, valve response monitoring, programmable auto-test routines, coupled with API670 (American Petroleum Institute) and API612 compliance make it ideal for use in petrochemical or power generation applications.

The ProTechTPS models with two dual-redundant relay outputs are designed to be applied with simplex or dual-redundant trip block assemblies or trip systems. The ProTechTPS models with three independent non-voted output models are designed to be applied with special turbine trip block assemblies that perform the 2-out-of-3 voting within their design.

Designed for system-critical applications, the ProTechTPS’s triple-modular architecture coupled with its on-line testing and on-line repair capabilities give it one of the highest availability and reliability ratings in the industry.


The ProTechTPS is a safety PLC (programmable logic controller) with integrated overspeed protection designed to safely shut down any plant process equipment, engine, or steam, gas, or hydro turbine upon sensing a safety event. This stand-alone safety device accepts 10 discrete or analog inputs per module (30 total) and one speed (MPU or PROX) input (3 total), uses custom-programmed logic to determine when a true safety event has occurred, then issues a shutdown command to safely shut down the equipment or turbine.

The ProTechTPS utilizes a triple modular redundant architecture and 2-out-of-3 voting logic to accurately determine unsafe conditions and ensure that no single-point failure will affect system reliability or availability. With this design, system failures (switches, transducers, modules) are detected, annunciated, and allowed to be repaired or replaced while the monitored system continues to operate on-line.

Designed to safely protect high speed rotating equipment in system-critical applications, this safety PLC’s total response time is less than 12 milliseconds for its independent voted output models and 20 milliseconds for its 2-out-of-3 voted models.

Depending on the system design, the ProTechTPS can be purchased with two dual-redundant trip relay outputs using a 2-out-of-3 voted architecture, or with three independent non-voted trip relay outputs (typically used to interface with a 2-out-of-3 based trip block assembly). Programmable inputs and outputs, 4–20 mA speed readouts, and Modbus make this safety PLC easy to integrate into any plant safety system or function as a stand- alone safety system.

*—Modbus is a trademark of Schneider Automation Inc.

The ProTechTPS is available in flush-mount models designed to be installed within a standard 24” (610 mm) cabinet front door, or models designed to be bulkhead mounted on a wall or skid near the turbine set. Designed for harsh environments when installed within an enclosure, this device has an ingress protection rating of IP56 (protected against dust and completely protected against jets of water of similar force to heavy seas).

Designed for high reliability, each ProTechTPS module (A, B, C), depending on the purchased model, accepts two high-voltage power inputs (90–240 Vac / 100–150 Vdc) or one highvoltage power input (90–240 Vac / 100–150 Vdc) and one low-voltage power input (18–32 Vdc). This design works on a high-signal-select basis, allowing the unit to fully operate with either or both power sources available.

ProTech TPS (Safety PLC with Integrated Overspeed Protection)

Total Protection System

Product Specification 03371


  • IEC61508 SIL-3 Certified
  • API670 & API612 Compliant
  • Overspeed protection
  • Acceleration & deceleration protection
  • Userprogrammable logic
    • 10 inputs
    • Discrete or analog
    • Trip/alarm logic
    • Test logic
  • 2-out-of-3 voting
  • High availability (TMR)
  • On-line testing
  • On-line repair
  • Auto test routines
  • Trip valve health monitoring function
  • Trip, alarm & test logs
  • Modbus communications
  • Password security protection
  • 12 millisecond response time (independent voted models)
  • Internal frequency generator

Fact sheet

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