5.8 L: Protection Functions262 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical ManualAutomatic Parameter SetupIn Closed Loop Vector Control for induction motors or PM motors the Inertia Auto-Tuning function can be used to let thedrive automatically adjust this parameter. Refer to Auto-Tuning on page 109.Manual Parameter SetupParameter L3-25 can be calculated by:■ L3-26: Additional DC Bus CapacitorsSets the capacity of any additional DC bus capacitors that have been installed. This data is used in calculations for SingleDrive KEB Ride-Thru 2. This setting needs to be adjusted only if external capacity is connected to the drives DC bus andSingle Drive KEB 2 is used.■ L3-27: Stall Prevention Detection TimeSets a delay time from when the Stall Prevention level is reached and the actual Stall Prevention function is activated.◆ L4: Speed DetectionThese parameters set up the speed agree and speed detection functions which can be assigned to the multi-functionoutput terminals.■ L4-01, L4-02: Speed Agreement Detection Level and Detection WidthParameter L4-01 sets the detection level for the digital output functions “Speed agree 1,” “User-set speed agree 1,”“Frequency detection 1,” and “Frequency detection 2.”Parameter L4-02 sets the hysteresis level for these functions.Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page 224, Settings 2, 3, 4, and5.■ L4-03, L4-04: Speed Agreement Detection Level and Detection Width (+/-)Parameter L4-03 sets the detection level for the digital output functions “Speed agree 2,” “User-set speed agree 2,”“Frequency detection 3,” and “Frequency detection 4.”Parameter L4-04 sets the hysteresis level for these functions.Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page 224, Settings 13, 14, 15,and 16.■ L4-05: Frequency Reference Loss Detection SelectionThe drive can detect a loss of an analog frequency reference from input A1, A2, or A3. Frequency reference loss isdetected when the frequency reference drops below 10% of the reference before or below 5% of the maximum outputfrequency within 400 ms.No. Name Setting Range DefaultL3-26 Additional DC Bus Capacitors 0 to 65000 μF 0 μFNo. Name Setting Range DefaultL3-27 Stall Prevention Detection Time 0 to 5000 ms 50 msNo. Name Setting Range DefaultL4-01 Speed Agreement Detection Level 0.0 to 400.0 Hz 0.0 HzL4-02 Speed Agreement Detection Width 0.0 to 20.0 Hz Determined by A1-02No. Name Setting Range DefaultL4-03 Speed Agreement Detection Level (+/-) -400.0 to 400.0 Hz 0.0 HzL4-04 Speed Agreement Detection Width (+/-) 0.0 to 20.0 Hz Determined by A1-02L3-25 = Machine InertiaMotor Inertia common_TMonly
