YASKAWA A1000 Technical Manual page 287


L3-23: Automatic Reduction Selection for Stall Prevention during Run
This function reduces the Stall Prevention during run level in the constant power range.
No.
L3-23 Automatic Reduction Selection for Stall Prevention During Run
Setting 0: Disabled
The level set in L3-06 is used throughout the entire speed range.
Setting 1: Enabled
The Stall Prevention level during run is reduced in the constant power range. The lower limit will be 40% of L3-06.

L3-24: Motor Acceleration Time for Inertia Calculations
Sets the time it takes to accelerate the motor from stop to the maximum speed at motor rated torque. This parameter
should be set 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).
No.
L3-24 Motor Acceleration Time for Inertia Calculations
<1> Parameter L3-24 is defaulted for a YASKAWA standard 4-pole motor. During Auto-Tuning, L3-24 will be initialized to a YASKAWA standard
4-pole motor if parameter E2-11 is changed. This value also changes based on the motor code set to E5-01 when using the Open Loop Vector
Control Mode for PM motors.
Automatic Parameter Setup
In Closed Loop Vector Control for induction motors or PM motors, the Inertia Auto-Tuning function can be used to let
the drive automatically adjust this parameter.
Manual Parameter Setup
Calculations are made as follows:
The rated torque can be calculated as follows:

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).
No.
L3-25
When set incorrectly, a fairly large current ripple can result during Single Drive KEB 2 (L2-29 = 1) and overvoltage
suppression (L3-11 = 1) or other faults such as ov, Uv1, and oC may occur.
Automatic Parameter Setup
In Closed Loop Vector Control for induction motors or PM motors the Inertia Auto-Tuning function can be used to let the
drive automatically adjust this parameter.
Manual Parameter Setup
Parameter L3-25 can be calculated by:
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Name
Name
Refer to Auto-Tuning on page
2 J [kgm 2 ] n
L3-24 =
60 T
rated
60 P
Motor
T [Nm] =
rated 2 n
rated
Name
Load Inertia Ratio
Refer to Auto-Tuning on page
Machine Inertia
L3-25 =
Motor Inertia
5.8 L: Protection Functions
Setting Range
0 or 1
Setting Range
0.001 to 10.000 s
120.
[min -1 ]
rated
[Nm]
[kW] 10 3
-1
[min ]
Setting Range
1.0 to 1000.0
120.
Default
0
Default
Determined by o2-04, C6-01, E2-11, and E5-01
<1>
Default
1.0
5
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