5.8 L: Protection FunctionsYASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual 263Parameter Details5Figure 5.100Figure 5.100 Loss of Reference FunctionTo have a digital output trigger when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to C. Refer to SettingC: Frequency reference loss on page 228 for details on setting the output function.Parameter L4-05 selects the operation when a frequency reference loss is detected.Setting 0: StopDrive follows the frequency reference (which is no longer present) and simply stops the motor.Setting 1: Continue operation with reduced frequency referenceThe drive will continue operation at the frequency reference value set in parameter L4-06. When the external frequencyreference value is restored, the operation is continued with the frequency reference.■ L4-06: Frequency Reference at Reference LossSets the frequency reference level the drive runs with when L4-05 = 1 and a reference loss was detected. The value is setas a percentage of the frequency reference before the loss was detected.■ L4-07: Speed Agreement Detection SelectionDetermines when frequency detection is active using parameters L4-01 through L4-04.Setting 0: No detection during baseblockSetting 1: Detection always enabled◆ L5: Fault RestartAfter a fault has occurred, this function attempts to automatically restart the motor and continue operation instead ofstopping.The drive can be set up to perform a self-diagnostic check and resume the operation after a fault has occurred. If the self-check is successful and the cause of the fault has disappeared, the drive restarts by first performing Speed Search (Referto b3: Speed Search on page 146 for details).DANGER! Never use the fault restart function in hoist-type applications.The drive can attempt to restart itself following the faults listed below.No. Name Setting Range DefaultL4-05 Frequency Reference Loss Detection Selection 0 or 1 0No. Name Setting Range DefaultL4-06 Frequency Reference at Reference Loss 0.0 to 100.0% 80.0%No. Name Setting Range DefaultL4-07 Speed Agreement Detection Selection 0 or 1 0Fault Name Fault NameGF Ground Fault oL4 Overtorque 2LF Output Open Phase ov DC Bus OvervoltageoC Overcurrent PF Input Phase LossoH1 Drive Overheat rH Braking Resistor FaultoL1 Motor Overload rr Braking Transistor FaultoL2 Drive Overload Uv1<1> When L2-01 is set to 1 through 4 (continue operation during momentary power loss)DC Bus Undervoltage <1>oL3 Overtorque 1 Sto Pull-Out Detection100%400 msAnalogfrequencyreferenceLoss ofReferenceoutput time10%ONOFF common_TMonly
