What function does the GTM VIBS perform during a STOP condition?

The function of the Gas Turbine Maintenance (GTM) Vibrations Monitoring System (VIBS) during a STOP condition primarily involves stopping the alarms. When the system detects that a stop condition has been implemented, it will cease any active alarms that were previously triggered. This is important for reducing confusion and ensuring that operators are not receiving alarm notifications for conditions that are no longer relevant once the turbine has been safely shut down.

In this context, the system's role is to manage alarm states appropriately based on the operational status of the gas turbine. By stopping the alarms during a STOP condition, the VIBS facilitates a clearer operating environment for the technicians and operators, allowing them to focus on the next steps in the shutdown process without distraction from alarms that would indicate issues in normal operating conditions.

Other functions, while critical during operational modes, are not applicable during a STOP condition. For instance, raising alarms typically happens during abnormal operational conditions, initiating cooling is more relevant while the turbine is running, and performing diagnostic checks are generally part of an operational assessment rather than an action taken during a shutdown.