5.8 L: Protection Functions
328 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
• T
rated
= Motor rated torque (N∙m)
The rated torque is calculated using the following expression.
P
Motor
= Motor Rated Power (kW)
â– 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
(0.1 - 1000.0)
Set one of these parameters to enable L3-25:
• L3-04 = 2 [Stall Prevention during Decel = Intelligent (Ignore Decel Ramp)]
• L3-11 = 1 [Overvoltage Suppression Select= Enabled]
Note:
If you set this value incorrectly when L3-11 = 1, it can cause large current ripples and ov [Overvoltage], Uv1 [DC Bus Undervoltage], or oC
[Overcurrent] faults.
Manually Adjust Parameters
Use this formula to find the load inertia ratio:
â– L3-26: Additional DC Bus Capacitors
No.
(Hex.)
Name Description
Default
(Range)
L3-26
(0455)
Expert
Additional DC Bus
Capacitors
Sets the capacity for external main circuit capacitors. Usually it is not necessary to change this
setting.
0 μF
(0 to 65000 μF)
â– L3-27: Stall Prevention Detection Time
No.
(Hex.)
Name Description
Default
(Range)
L3-27
(0456)
Stall Prevention Detection
Time
Sets a delay time between reaching the Stall Prevention level and starting the Stall Prevention
function.
50 ms
(0 - 5000 ms)
â– L3-35: Speed Agree Width for Auto Decel
No.
(Hex.)
Name Description
Default
(Range)
L3-35
(0747)
Expert
Speed Agree Width for Auto
Decel
Sets the width for speed agreement when L3-04 = 2 [Decel Stall Prevention Selection = Automatic
Decel Reduction]. Usually it is not necessary to change this setting.
0.00 Hz
(0.00 - 1.00 Hz)
Set this parameter when hunting occurs while you use a frequency reference through an analog input.
â—† L4: Speed Detection
L4 parameters set the output of signals to the MFDO terminals, for example frequency agree and frequency detection.
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