12.8 L: PROTECTION
780 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
Note:
When Auto-Tuning changes the value of E2-11 [Motor Rated Power (kW)], the drive will automatically set this parameter to the value
for a Yaskawa standard motor (4 poles). When you use a PM motor, the drive uses the value in E5-01 [PM Mot Code Selection] to
change this parameter.
Automatically Adjust Parameters
Execute the Inertia Tuning process when A1-02 = 3 or 7 [Control Method = CLVector or PM CLVector].
Parameters are automatically adjusted.
Manually Adjust Parameters
Use this formula to find the motor acceleration time:
• J
Motor
= Moment of inertia of motor (kg m
2
)
• n
rated
= Motor rated speed (min
-1
, r/min)
• T
rated
= Motor rated torque (N∙m)
The rated torque is calculated using the following expression.
P
Motor
= Motor Rated Power (kW)
■ L3-25 Load Inertia Ratio
No.
(Hex.)
Name Description
Default
(Range)
L3-25
(046F)
Expert
Load Inertia Ratio
Sets the ratio between motor inertia and machine inertia.
1.0
(1.0 - 1000.0)
Set one of these parameters to enable L3-25:
• L2-29 = 2 [KEB Method = Single KEB2 Ride-Thru]
• L3-04 = 1 [StallP@Decel Enable = Enabled] and L3-50 = 1 [StallP@Decel Mode = Automatic Decel
Reduction]
• L3-11 = 1 [Overvolt Supression Select = Enabled]
• H1-xx = 42 or 43 [DI Function Select = KEB Thru2 NC or KEB Thru2 NO]
Note:
• If you set this value incorrectly when L2-29 = 1, H1-xx = 42 or 43, or L3-11 = 1, it can cause large current ripples and ov
[Overvoltage], Uv1 [DC Bus Undervoltage], or oC [Overcurrent] faults.
• KEB Tuning will automatically set this value.
Automatically Adjust Parameters
Do Inertia Tuning when A1-02 = 3 or 7 [Control Method = CLVector or PM CLVector]. The drive will
automatically adjust parameters.
Manually Adjust Parameters
Use this formula to find the load inertia ratio:
■ L3-26 DC Bus Capacitors Extension
No.
(Hex.)
Name Description
Default
(Range)
L3-26
(0455)
Expert
DC Bus Capacitors
Extension
Sets the capacity for external main circuit capacitors. Sets this parameter when you use the KEB
Ride-Thru function. Usually it is not necessary to change this setting.
0 μF
(0 to 65000 μF)
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