2.9 L: Protection Functions
382 YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING
• 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 Select = KEB Ride-Thru 2 Activate (N.O./N.C.)]
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 Motor Code Selection] to change L3-
24.
■ 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 L3-20:
• 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 Select = 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.
■ 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. Sets this parameter when you use the KEB Ride-Thru function.
0 μF
(0 to 65000 μF)
■ 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.
60 ms
(0 - 5000 ms)
■ L3-34: Torque Limit Delay Time
No.
(Hex.)
Name Description
Default
(Range)
L3-34
(016F)
Expert
Torque Limit Delay Time
Sets the filter time constant that returns the torque limit to its initial value when KEB operation
operates in Single Drive KEB Ride-Thru mode.
Determined by A1-02
(0.000 - 1.000 s)
When vibration occurs during operation of Single Drive KEB Ride-Thru 2, increase this parameter in 0.010-unit
increments.
Note:
The Single Drive KEB Ride-Thru 2 mode operates when L2-29 = 1 [KEB Method Selection = Single Drive KEB Ride-Thru 2] and H1-xx =
7A or 7B [Terminal Sx Function Selection = KEB Ride-Thru 2 (N.C./N.O.)].
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