n
L3-21: Accel/Decel Rate Calculation Gain
Determines the proportional gain used by overvoltage suppression (L3-11 = 1), Single Drive KEB 2 (L2-29 = 1), and Intelligent
Stall Prevention during deceleration (L3-04 = 2) to calculate acceleration and deceleration rates.
No. Name Setting Range Default
L3-21 Accel/Decel Rate Calculation Gain 0.10 to 10.00
<1>
<1> This value is reset to its default value when the control mode is changed (A1-02). The value shown here is for OLV.
Adjustment for Single Drive KEB 2 (L2-29 = 1) and Intelligent Stall Prevention During Deceleration
• Reduce L3-21 in steps of 0.05 if there is a fairly large speed or current ripple.
• Small reductions of L3-21 can help solve problems with overvoltage and overcurrent.
• Decreasing this setting too much can cause slow DC bus voltage control response and may also lengthen deceleration times
beyond optimal levels.
Adjustment for Overvoltage Suppression
• Increase this setting in steps of 0.1 if overvoltage occurs as a result of a regenerative load when overvoltage suppression is
enabled (L3-11 = 1).
• Decrease L3-21 in steps of 0.05 if there is a fairly large speed ripple when overvoltage suppression is enabled.
n
L3-24: Motor Acceleration Time for Inertia Calculations
Sets the time to accelerate the motor from stop to the maximum speed at motor rated torque. Set this parameter when using
Single Drive KEB 2 (L2-29 = 1), Intelligent Stall Prevention during deceleration (L2-04 = 2), or the overvoltage suppression
function (L3-11 = 1).
No. Name Setting Range Default
L3-24 Motor Acceleration Time for Inertia Calculations 0.001 to 10.000 s
Determined by o2-04, C6-01,
E2-11, and E5-01
<1>
<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 OLV/PM.
Automatic Parameter Setup
In CLV/PM, use the Inertia Auto-Tuning function to let the drive automatically adjust this parameter. Refer to Auto-
Tuning on page 100.
Manual Parameter Setup
Make the calculations in the formula below:
L3-24 =
2 J [kgm
2
] n [r/min]
60 T [Nm]
rated
rated
Calculate the rated torque in the formula below:
60 P [kW] 10
3
2 n [r/min]
T [Nm] =
Motor
rated
rated
n
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. Name Setting Range Default
L3-25 Load Inertia Ratio 1.0 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.
Automatic Parameter Setup
Note:
PM motor control modes are not available on 600 V class drives, CIMR-Ao5oooooooo.
In CLV for induction motors or PM motors, use the Inertia Auto-Tuning function to let the drive automatically adjust this
parameter. Refer to Auto-Tuning on page 100.
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
255
5
Parameter Details
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