12.8 L: PROTECTION
778 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
Figure 12.131 Stall Prevention Level during Run with Analog Input
■ L3-11 Overvolt Supression Select
No.
(Hex.)
Name Description
Default
(Range)
L3-11
(04C7)
Overvolt Supression 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 DCBus Regul.Level
No.
(Hex.)
Name Description
Default
(Range)
L3-17
(0462)
DCBus Regul.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.
400 V Class: 750 V
(400 V Class: 300 - 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 [Overvolt Supression Select = Enabled].
• L3-04 = 1 [StallP@Decel Enable = Enabled] and L3-50 = 1 [StallP@Decel Mode = Automatic Decel
Reduction].
■ L3-20 DCBus VoltAdj Gain
No.
(Hex.)
Name Description
Default
(Range)
L3-20
(0465)
Expert
DCBus VoltAdj 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 = 2 [KEB Method = Single KEB2 Ride-Thru]
• L3-04 = 1 [StallP@Decel Enable = Enabled] and L3-50 = 1 [StallP@Decel Mode = Automatic Decel
Reduction]
• L3-11 = 1 [Overvolt Supression Select = Enabled]
• H1-xx = 42 or 43 [DI Function Select = KEB Thru2 NC or KEB Thru2 NO]
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 = 42 or 43, 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.
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