Protective and Diagnostic Functions7- 9 Alarm DetectionAlarms are detected as a type of Inverter protection function that do not operate the fault contact output. Thesystem will automatically returned to its original status once the cause of the alarm has been removed.The Digital Operator display flashes and the alarm is output from the multi-function outputs (H2-01 to H2-03).When an alarm occurs, take appropriate countermeasures according to the table below.Table 7.2 Alarm Displays and ProcessingDisplay Meaning Probable causes Corrective Actions(blink-ing)Forward/Reverse Run CommandsInput TogetherBoth the forward and Reverse RunCommands have been ON for morethan 0.5 s.-Check the sequence of the forwardand Reverse Run Commands.Since the rotational direction isunknown, the motor will be deceler-ated to a stop when this minor faultoccurs.(blink-ing)Main Circuit UndervoltageThe following conditions occurredwhen there was no Run signal.• The main circuit DC voltage wasbelow the Undervoltage DetectionLevel Setting (L2-05).• The surge current limiting mag-netic contactor opened.• The control power supply voltagewhen below the CUV level.See causes for UV1, UV2, and UV3faults in the previous table.See corrective actions for UV1, UV2,and UV3 faults in the previous table.(blink-ing)Main Circuit OvervoltageThe main circuit DC voltage exceededthe overvoltage detection level.200 V Class: Approx. 410 V400 V Class: Approx. 820 VThe power supply voltage is too high. Decrease the voltage so it's withinspecifications.(blink-ing)Cooling Fin OverheatingThe temperature of the Inverter's cool-ing fins exceeded the setting in L8-02.The ambient temperature is too high. Install a cooling unit.There is a heat source nearby. Remove the heat sourceThe Inverter cooling fan has stopped. Replace the cooling fan. (Contactyour Yaskawa representative.)(blink-ing)Inverter Overheating Pre-alarmAn OH2 alarm signal (Inverter over-heating alarm signal) was input from amulti-function input terminal (S3 toS8).- Clear the multi-function input termi-nal's overheating alarm input.(blink-ing)Motor OverheatingE was set for or H3-09 and themotor temperature thermistor inputexceeded the alarm detection level.The motor has overheated.Check the size of the load and thelength of the acceleration, decelera-tion, and cycle times.Check the V/f characteristics.Check the motor temperature input onterminals A2 .(blink-ing)Overtorque 1There has been a current greater thanthe setting in L6-02 for longer than thesetting in L6-03.-• Make sure that the settings in L6-02 and L6-03 are appropriate.• Check the mechanical system andcorrect the cause of the overtorque.H3-05and A3
