12.9 L: Protection Functions
892 YASKAWA SIEPC71061705H GA700 Series Technical Manual
Note:
• This parameter is applicable when L3-05 = 1, 2 [Stall Prevention during RUN = Deceleration Time 1 (C1-02), Deceleration Time 2
(C1-04)].
• When L3-23 = 1 [Stall P Reduction at Constant HP = Automatic Reduction @ CHP Region], the drive will automatically decrease the
level in the constant output range.
• The upper limit of the setting range changes when C6-01 [Normal / Heavy Duty Selection] changes.
–150% when C6-01 = 0 [Heavy Duty Rating 1 (HD1) for Constant Torque Applications].
–110% when C6-01 = 1 [Normal Duty Rating 1 (ND1) for Variable Torque Applications].
Use an Analog Input to Change the Stall Prevent Level during Run
When H3-xx = 8 [MFAI Function Select = Stall Prevent Level During Run], you can change the stall prevention
level during run through the input gain and bias settings for terminals A1, A2, and A3.
If you set the input level for terminals A1, A2, and A3 [H3-xx = 8] and L3-06, the drive will use the smaller value
for Stall Prevent Level during Run.
Figure 12.138 Stall Prevention Level during Run with Analog Input
■ 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:
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