6.5 Minor Faults/Alarms302 YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical ManualCode Name Cause Possible SolutionA fault occurred in the feedback inputcircuit of the drive.Replace the board or the entire drive. Forinstructions on replacing the control board, contactYaskawa or your nearest sales representative.Note:• Detected if PID feedback input is lower than the level set in b5-13 [PID Feedback Loss Detection Lvl] for longer than b5-14 [PIDFeedback Loss Detection Time].• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.• If detected, the drive will operate the motor according to the stop method set in b5-12 [Feedback Loss Detection Select].Code Name Cause Possible SolutionHCA Current Alarm The load is too heavy. • Reduce the load for applications with repetitivestarts and stops.• Replace the drive with a larger capacity model.The acceleration/deceleration time is tooshort.• Calculate the torque necessary duringacceleration relative to the load inertia and thespecified acceleration time.• Increase the value set in C1-01 to C1-08[Acceleration/Deceleration Time] until thenecessary torque is achieved.• Replace the drive with a larger capacity model.The drive is attempting to operate aspecialized motor or a motor thatexceeds the maximum applicable motoroutput of the drive.• Check the motor nameplate and reevaluate themotor and drive to ensure that the drive ratedcurrent is larger than the motor rated current.• Replace the drive with a larger capacity model.The current level increased temporarilydue to speed search after a momentarypower loss or while attempting toperform Auto Restart.If a rise in current occurs due to a speed search orAuto Restart, HCA may be temporarily displayed.The alarm will only appear briefly. There is noneed to take action to prevent the alarm fromoccurring in such instances.Note:• Detected if the drive output current exceeded the overcurrent alarm level (150% of the rated current).• If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.Code Name Cause Possible SolutionL24v External Power 24V Supply The voltage of the external 24 V powersupply being used as a backup powersupply has dropped. The main circuitpower supply is in its normal state.• Check for any wiring errors or disconnectedwires in the external 24 V power supply, and fixany problems.• Check for any problems with the external 24 Vpower supply.• Set o2-23 = 0 [Lost Detection of Ext. Power 24V= Disabled].Note:The minor fault signal is not output when a minor fault is detected even after setting o2-23 = 1 [Lost Detection of Ext. Power 24V =Enabled].Code Name Cause Possible SolutionLoG Log Communication Fault A micro SD card is not inserted into thekeypad.Insert a micro SD card into the keypad.• USB connected• The number of log communicationfiles has grown to 1000 or higher.• The capacity of the micro SD cardhas been exceeded.• Attributes 1 and 2 were written to afile with a log communication filenumber that does not exist.• The line number data in a logcommunication file was modified.• A log end command was transmitteddespite the fact that the logcommunication file was closed.Set o5-01 = 1 [Log Start/Stop Selection = ON].Note:If detected, H2-xx = 10 [MFDO Function Select = Minor Fault] will be ON.
