Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 981
■ L3-11: Overvoltage Suppression Select
No.
(Hex.)
Name Description
Default
(Range)
L3-11
(04C7)
Overvoltage Suppression
Select
Sets the overvoltage suppression function.
0
(0, 1)
0 : Disabled
The drive does not adjust the regenerative torque limit or the output frequency. If you apply a regenerative load, the
drive can detect an ov [Overvoltage] fault. Use this setting with a dynamic braking option.
1 : Enabled
When a regenerative load increases the DC bus voltage, the drive decreases the regenerative torque limit and
increases the output frequency to prevent ov
■ L3-17: DC Bus Regulation Level
No.
(Hex.)
Name Description
Default
(Range)
L3-17
(0462)
DC Bus Regulation Level
Sets the target value for the DC bus voltage when the overvoltage suppression function and the Decel
Stall Prevention function (Intelligent Stall Prevention) are active.
200 V Class: 375 V,
400 V Class: 750 V
(200 V Class: 150 to 400 V,
400 V Class: 300 to 800 V)
Note:
This value is initialized when E1-01 [Input AC Supply Voltage] is changed.
Sets this parameter for any of the following circumstances.
• L3-11 = 1 [OV Suppression Function Select = Enabled].
• L3-04 = 2 [Decel Stall Prevention Selection = Automatic Decel Reduction].
■ L3-20: DC Bus Voltage Adjustment Gain
No.
(Hex.)
Name Description
Default
(Range)
L3-20
(0465)
Expert
DC Bus Voltage Adjustment
Gain
Sets the proportional gain used to control the DC bus voltage.
Determined by A1-02
(0.00 - 5.00)
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 stall prevention during deceleration function causes ov [Overvoltage] and Uv1 [DC Bus Undervoltage] faults when you start deceleration
and L2-29 = 1, H1-xx = 7A or 7B, or L3-04 = 2, gradually increase this parameter in 0.1-unit increments. If the setting value is too high, it
can cause large speed or current ripples.
• If sudden increases in the regenerative load cause ov faults and L3-11 = 1, gradually increase this parameter in 0.1-unit increments. If the
setting value is too high, it can cause large speed or current ripples.
■ L3-21: OVSuppression Accel/Decel P Gain
No.
(Hex.)
Name Description
Default
(Range)
L3-21
(0466)
Expert
OVSuppression Accel/Decel
P Gain
Sets the proportional gain to calculate acceleration and deceleration rates.
Determined by A1-02
(0.10 - 10.00)
Set one of these parameters to enable L3-20:
• L2-29 = 1 [Kinetic Energy Backup Method = Single Drive KEB Ride-Thru 2]
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