YASKAWA Varispeed F7 User Manual

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448 Protective Operations8.1 Fault Detection ProcessingFaults can be detected by two methods: Inverter fault detection and SI-T fault detection.The SI-T is notified of Inverter faults by the internal interface, and the SI-T sends theresponse data, ALARM or STATUS.The SI-T notifies Inverter of SI-T faults by the internal interface, and the faults are simulta-neously sent the response data, ALARM or STATUS.The following four types of faults can be detected. The subsequent operation varies depend-ing on the type of fault.Note: The meanings of each symbol are as follows.−: No change→: Fault notification to Inverter←: Fault notification from InverterWhen consecutive alarms occur, the SI-T provides notification of the most recent alarm witha MECHATROLINK response data. If warnings occur simultaneously, notification priorityis given to the warning with the lowest warning code. If alarms and warnings are mixedtogether, the SI-T gives notification priority to alarms.The following table shows the response data when consecutive alarms or warnings occurs.Fault Type Description LocationAlarm Inverter alarm Major fault that causes damage to the Inverter or machinery InverterCommunications alarm Interference related to MECHATROLINK-II communications SI-TWarning Inverter warning Illegal operation or minor fault not posing any immediate danger InverterCommunications warning MECHATROLINK-II communications fault warning SI-TFault Type SI-T Processing Direction ofCommunicationsResetMECHATROLINK Response LED2StatusProcessingALARM STATUSWARNG ALMInverter alarm CODE − 1 − No special processing ← RequiredCommunications alarm CODE − 1 Lit Notification to Inverter c→←dRequiredInverter warning CODE 1 − − No special processing ← RequiredCommunicationswarningCODE 1 − − No special processing None Not required