Digital Operator Display Minor Fault NameLT-3Soft Charge Bypass Relay Maintenance TimeThe DC bus soft charge relay is nearing the end of its expected performance life.Note: The signal closes when the maintenance period ends if H2-oo = 2F. The signal will not closeif H2-oo = 10.Cause Possible SolutionsThe DC bus soft charge relay has reached90% of expected performance life. Replace the drive.Digital Operator Display Minor Fault NameLT-4IGBT Maintenance Time (50%)IGBTs have reached 50% of their expected performance life.Note: The signal closes when the maintenance period ends if H2-oo = 2F. The signal will not closeif H2-oo = 10.Cause Possible SolutionsIGBTs have reached 50% of their expectedperformance life. Check the load, carrier frequency, and output frequency.Digital Operator Display Minor Fault NameoHHeatsink OverheatThe temperature of the heatsink exceeded the overheat pre-alarm level set to L8-02 (90-100 °C). Defaultvalue for L8-02 is determined by drive capacity (o2-04).Cause Possible SolutionsSurrounding temperature is too high• Check the surrounding temperature.• Improve the air circulation within the enclosure panel.• Install a fan or air conditioner to cool surrounding area.• Remove anything near drive that may cause extra heat.Internal cooling fan has stopped. • Replace the cooling fan.• After replacing the drive, set parameter o4-03 to 0 to reset the cooling fan operation time.Airflow around the drive is restricted.• Provide proper installation space around the drive.• Allow for the proper space and ensure that there is sufficient circulation around the control panel.• Check for dust or other foreign materials clogging the cooling fan.• Clear debris caught in the fan that restricts air circulation.Digital Operator Display Minor Fault NameoH2 Heatsink Overheat Warning“Heatsink Overheat Warning” was input to a multi-function input terminal, S1 through S8 (H1-oo= B).Cause Possible SolutionsAn external device triggered an overheatwarning in the drive. Search for the device that tripped the overheat warning. Remove the cause of the problem.Digital Operator Display Minor Fault NameoH3Motor OverheatThe motor overheat signal entered to a multi-function analog input terminal exceeded the alarm level (H3-02,H3-06 or H3-10 = E).Cause Possible SolutionsMotor thermostat wiring is faulty (PTCinput). Repair the PTC input wiring.There is a fault on the machine side (e.g.,the machine is locked up).• Check the status of the machine.• Remove the cause of the fault.2.5 Alarm Detection208 YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
