YASKAWA GA800 Technical Reference page 983

• J = Moment of inertia of motor (kg m
Motor
• n = Motor rated speed (min
rated
• T
= Motor rated torque (N∙m)
rated
The rated torque is calculated using the following expression.
P = Motor Rated Power (kW)
Motor
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L3-25: Load Inertia Ratio
No.
Name
(Hex.)
L3-25 Load Inertia Ratio
(046F)
Expert
Set one of these parameters to enable L3-20:
• L2-29 = 1 [Kinetic Energy Backup Method = Single Drive KEB Ride-Thru 2]
• L3-04 = 2 [Stall Prevention during Decel = Intelligent (Ignore Decel Ramp)]
• L3-11 = 1 [Overvoltage Suppression Select= Enabled]
• H1-xx = 7A or 7B [MFDI Function Selection = KEB Ride-Thru 2 Activate (N.O./N.C.)]
Note:
• If you set this value incorrectly when L2-29 = 1, H1-xx = 7A or 7B, 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
When A1-02 = 3, 7 [Control Method Selection = CLV, CLV/PM], do Inertia Tuning. Parameters are automatically
adjusted.
Manually Adjust Parameters
Use this formula to find the load inertia ratio:
■
L3-26: Additional DC Bus Capacitors
No.
Name
(Hex.)
L3-26 Additional DC Bus
Capacitors
(0455)
Expert
■
L3-27: Stall Prevention Detection Time
No.
Name
(Hex.)
L3-27 Stall Prevention Detection
Time
(0456)
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
2 )
-1 , r/min)
V/f CL-V/f OLV CLV AOLV
Sets the ratio between motor inertia and machine inertia.
V/f CL-V/f OLV CLV AOLV
Sets the capacity for external main circuit capacitors. Usually it is not necessary to change this
setting. Sets this parameter when you use the KEB Ride-Thru function.
V/f CL-V/f OLV CLV AOLV
Sets a delay time between reaching the Stall Prevention level and starting the Stall Prevention
function.
12.9 L: Protection Functions
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
1.0
(0.1 - 1000.0)
Default
(Range)
0 μF
(0 to 65000 μF)
Default
(Range)
50 ms
(0 - 5000 ms)
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