11.9 L: Protection Function872 YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual1 : Enabled■ L8-55: InternalBrakingTransistorProtectNo.(Hex.) Name Description Default(Range)L8-55(045F)InternalBrakingTransistorProtect Enables or disables protection for the internal braking transistor.1(0, 1)0 : DisableDisables braking transistor protection.Use this setting in the following situation. Enabling the braking transistor in the following situations may cause anrF [Braking Resistor Fault].• When using a regenerative converter, such as the D1000.• When using a regenerative unit, such as the R1000.• When connecting braking resistor options to the drive, such as CDBR units.• When using no internal braking transistor.1 : Protection enabledProtects internal braking transistor when using a braking transistor or optional braking resistors.The following models have a built-in braking transistor .• 2004 to 2138• 4002 to 4168■ L8-56: Stl Act TimeNo.(Hex.) Name Description Default Setting(Range)L8-56(047D)Stl Act TimeSets the time that the acceleration stall prevention function can continue tooperate, after which the STPo [Desynchronization Error] is detected.5000 ms(100 - 5000 ms)Note:If the set time for L8-56 is too low, STPo misdetections may occur. If the set time for L8-56 is too high, STPo detection may stopfunctioning.■ L8-57: Stl Retry CountNo.(Hex.) Name Description Default Setting(Range)L8-57(047E)Stl Retry CountSets the number of times the acceleration stall prevention function canoperate until speeds match, after which the STPo “Desynchronization Error”is detected.10 times(1 to 10 times)Note:If the number of operations for L8-57 is too low, STPo misdetections may occur. If the number of operations for L8-57 is too high, STPodetection may stop functioning.■ L8-90: STPo Detection LevelNo.(Hex.) Name Description Default Setting(Range)L8-90(0175)STPo DetectionLevel STPo [Desynchronization Error] is detected when the control fault reachesthe detection level of L8-90.Determined by A1-02(0 to 5000 times)This function detects the desynchronization state of PM motors.Desynchronization due to motor locks cannot be detected when the frequency reference is low during startupwhile the motor is locked. If fault detection is necessary in environments with potential for startups in theseconditions, set the control fault detection level to enable detection of desynchronization due to motor locking.Increase the setting in increments of 5.V/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLVV/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLVV/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLVV/f CL-V/f OLV CLV AOLV OLV/PMOLV/PM AOLV/PM CLV/PM EZOLV
