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L3-25: Load Inertia Ratio
Determines the ratio between the rotor inertia and the load. Set this parameter when using Single Drive KEB 2 (L2-29 = 1),
Intelligent Stall Prevention during deceleration (L3-04 = 2), or the overvoltage suppression function (L3-11 = 1).
Note: This function is available in OLV/PM control mode.
No. Name Setting Range Default
L3-25 Load Inertia Ratio 0.0 to 1000.0 1.0
When set incorrectly, a fairly large current ripple can result during Single Drive KEB 2 (L2-29 = 1). This may cause overvoltage
suppression (L3-11 = 1) or other faults such as ov, Uv1, and oC.
Calculate parameter L3-25 in the formula below:
L3-25 =
Machine Inertia
Motor Inertia
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L3-26: Additional DC Bus Capacitors
Sets the capacity of any additionally installed DC bus capacitors. This data is used in calculations for Single Drive KEB Ride-
Thru 2. Adjust this setting only if external capacity is connected to the DC bus and Single Drive KEB 2 is used.
No. Name Setting Range Default
L3-26 Additional DC Bus Capacitors 0 to 65000 μF 0 μF
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L3-27: Stall Prevention Detection Time
Sets a delay time from when the Stall Prevention level is reached and the actual Stall Prevention function is activated.
No. Name Setting Range Default
L3-27 Stall Prevention Detection Time 0 to 5000 ms 50 ms
u
L4: Speed Detection
These parameters set up the speed agree and speed detection functions that can be assigned to the multi-function output
terminals.
The speed is detected using the motor speed when A1-02 = 3 or 7.
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L4-01, L4-02: Speed Agreement Detection Level and Detection Width
Parameter 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.
No. Name Setting Range Default
L4-01 Speed Agreement Detection Level 0.0 to 240.0 Hz 0.0 Hz
L4-02 Speed Agreement Detection Width 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page 82, Settings 2, 3, 4, and 5.
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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.
No. Name Setting Range Default
L4-03 Speed Agreement Detection Level (+/-) -240.0 to 240.0 Hz 0.0 Hz
L4-04 Speed Agreement Detection Width (+/-) 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page 82, Settings 13, 14, 15, and
16.
1.8 L: Protection Functions
110
YASKAWA SIEP YAIZ1U 03B YASKAWA AC Drive – Z1000 Programming Manual
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