The HollySys ETS-LM is a dedicated Emergency Trip System (ETS) built upon the robust LM-G3 PLC platform. It is specifically engineered to monitor critical parameters of small turbine units and initiate an immediate, safe shutdown when operational limits are exceeded. By leveraging PLC technology, it ensures fast response, high reliability, and a long service life, making it an ideal choice for safeguarding turbine operations.

High-Reliability Redundancy Architecture

To ensure continuous operation and eliminate single points of failure, the ETS-LM features a comprehensive dual-redundant design. This includes redundancy for both modules and power supplies. In the event of a failure in any single PLC set or power supply line, the system remains completely unaffected, ensuring uninterrupted protection for the turbine unit.

Fast Response and Safety Isolation

The system is designed for rapid intervention, boasting a control cycle of less than 20 milliseconds. This ensures that any critical condition is detected and acted upon with minimal delay. Furthermore, the inputs and outputs of the two redundant PLC systems are isolated using relays, creating a physical hard isolation barrier. This design ensures system safety and stability, preventing faults from propagating across the system and withstanding interference from on-site electromagnetic and communication devices. The system is compliant with IEC 61131-2 and IEC 61000-4 standards and supports SIL3 safety certification.

Performance and Capacity

Built on the LM-G3 platform, the ETS-LM inherits a powerful processing core capable of executing basic Boolean instructions in as little as 0.37 μs. It provides ample program capacity of up to 120 KB, allowing for complex logic customization and flexible adjustment of protection measures. This combination of speed and capacity empowers operators to enhance protection strategies and optimize system performance over time.

Applications

The HollySys ETS-LM is ideally suited for a variety of critical protection applications, including:

• Small and medium-sized steam turbine emergency trip protection
• Gas turbine overspeed and critical parameter monitoring
• Industrial compressor unit safety shutdown systems
• Critical process protection in power generation and petrochemical industries

Technical Specifications