SL1070A Scienlab Test Bench Guard

SL1070A Scienlab Test Bench Guard

Keysight’s Scienlab Test Bench Guard (TBG) is an essential safety feature for operating battery test stands. It monitors the system to supervise the status and actions of the test stand. A safety programmable logic controller (PLC) is the backbone of the system. The TBG can be divided into two main safety features:

• Active safety features react in order to prevent hazard events:

-        Integrated sensors (e.g. Current-, Voltage-, Gas-, etc.) in the Scienlab Test Systems and the Test Chamber detect threshold limit violations or error states.  

-        A reaction matrix with basic safety features guarantees testing under preset conditions as determined by the customer.

-        A redundant measurement system works independent from the tester for significant values such as current, voltage and DUT temperature.    

• Passive safety features react to minimize the effects of hazardous events:

-       Integration of external safety features such as sprinkle water/mist, N2 inertization, and building fire alarm control of 3rd Party components.

The logical connection and trigger rules of these active and passive safety features are defined in the Safety Matrix. This Matrix is defined in cooperation with the customer during the project. Keysight recommends a Risk and Hazzard Analysis which forms the base of the safety concept and the Safety Matrix. Combinations of active and passive safety features fulfill demands on different Hazard-Levels.

Operating Computer for Scienlab Test Bench Guard 

• Beckhoff Industrial PC integrated in battery test system

Software

• TwinCAT Soft-PLC

• Test Bench Guard Control Software: 

-       Visualization of the state and values of the signals

-        User:

• Sets limits

• Acknowledges errors

• Sets a signal filter time 

• Disables/enables specific signals

• Saves and loads presets

-       Requirements: Windows operating system

Safety

Twin safe terminals and Twin safe-PLC to ensure reliable operation of the TBG

• Connects to other TBG components by real-time capable EtherCAT bus system

• Supports up to performance level E according to DIN EN ISO 13849

• Cut-out scenarios are defined by the safety matrix

• Inclusion and parametrization of analogue switch-off criteria is possible as well as CAN messages

• Signal inputs include:

-        Climate chamber door closed (safety input signal)  

-       Associated feedback signal for function monitoring

• Signal outputs inlcude:

-        Close output contactor channel x (safety output signal)