5.8 L: Protection Functions264 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical ManualUse parameters L5-01 to L5-05 to set up automatic fault restart.To output a signal during fault restart, set H2-01, H2-02, or H2-03 to 1E.■ L5-01: Number of Auto Restart AttemptsSets the number of times that the drive may attempt to restart itself.The method of incrementing the restart counter is determined by the setting of parameter L5-05. When the counterreaches the number set in L5-01, the operation stops and the fault has to be reset manually after correcting the cause.The restart counter is incremented at each restart attempt, regardless of whether the attempt was successful. When thecounter reaches the number set in L5-01, the operation stops and the fault has to be reset manually after correcting thecause.The number of fault restarts is reset back to zero when:• The drive operates normally for ten minutes following a fault restart.• A fault is cleared manually after protective functions are triggered.• The power supply is cycled.■ L5-02: Auto Restart Fault Output Operation SelectionDetermines if a fault output is triggered (H2- = E) when the drive attempts to restart.Setting 0: No fault outputSetting 1: Fault output is set■ L5-04: Fault Reset Interval TimeDetermines the amount of time to wait between restart attempts when parameter L5-05 is set to 1.■ L5-05: Fault Reset Operation SelectionSetting 0: Count successful restartsThe drive will continuously attempt to restart. If it restarts successfully, the restart counter is increased. This operation isrepeated each time a fault occurs until the counter reaches the value set in L5-01.Setting 1: Count restart attemptsThe drive will try to restart using the time interval set in parameter L5-04. A record is kept of the number of attempts torestart to the drive, regardless of whether or not those attempts were successful. When the number of attempted restartsexceeds the value set to L5-01, the drive gives up trying to restart.◆ L6: Torque DetectionThe drive provides two independent torque detection functions that trigger an alarm or fault signal when the load is tooheavy (oL), or suddenly drops (UL). They are set up using the L6- parameters. To indicate the underload or overloadcondition to an external device, digital outputs should be programmed as shown below.Note: When overtorque occurs in the application, the drive may stop due to overcurrent (oC) or overload (oL1). To prevent this, anoverload situation should be indicated to the controller before oC or oL1 occur in the drive. Use the torque detection for thispurpose. Use undertorque detection to discover application problems like a torn belt, a pump shutting off, or other similartrouble.No. Name Setting Range DefaultL5-01 Number of Auto Restart Attempts 0 to 10 Times 0 TimeNo. Name Setting Range DefaultL5-02 Auto Restart Fault Output Operation Selection 0 or 1 0No. Name Setting Range DefaultL5-04 Fault Reset Interval Time 0.5 to 600.0 s 10.0 sNo. Name Setting Range DefaultL5-05 Fault Reset Operation Selection 0 or 1 0
