YASKAWA A1000 Series

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L3-03: Stall Prevention Limit during Acceleration
The Stall Prevention level is automatically reduced when the motor is operated in the constant power range. L3-03 sets the
lower limit for this reduction as a percentage of the drive rated current.
No. Name Setting Range Default
L3-03 Stall Prevention Limit during Acceleration 0 to 100% 50%
Stall Prevention level during Acceleration
Output frequency
L3-03
E1-06
Base frequency
L3-02
Figure 4.35 Stall Prevention Level and Limit During Acceleration
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L3-04: Stall Prevention Selection during Deceleration
Stall
Prevention during deceleration controls the deceleration based on the DC bus voltage and prevents an overvoltage fault
caused by high inertia or rapid deceleration.
No. Name Setting Range Default
L3-04 Stall Prevention Selection During Deceleration
0 to 5
<1>
1
<1> Settings 3 through 5 are not available in OLV/PM. Settings 2 through 5 are not available in AOLV/PM and CLV/PM.
Setting 3 is not available in models 4A0930 or 4A1200.
Setting 0: Disabled
The
drive decelerates according to the set deceleration time. With high inertia loads or rapid deceleration, an overvoltage fault
may occur. If an overvoltage fault occurs, use dynamic braking options or switch to another L3-04 selection.
Setting 1: General-purpose Stall Prevention
The drive tries to decelerate within the set deceleration time. The drive pauses deceleration when the DC bus voltage exceeds
the Stall Prevention level and then continues deceleration when the DC bus voltage drops below that level. Stall Prevention
may be triggered repeatedly to avoid an overvoltage fault. The DC bus voltage level for Stall Prevention depends on the input
voltage setting E1-01.
Drive Input Voltage Stall Prevention Level during Deceleration
200 V Class 377 Vdc
400 V Class 754 Vdc
600 V Class 1084 Vdc
Note: 1. Do not use this setting in combination with a Dynamic Braking Resistor or other dynamic braking options. If Stall Prevention during
deceleration is enabled, it will be triggered before the braking resistor option can operate.
2. This method may lengthen the total deceleration time compared to the set value. If this is not appropriate for the application consider
using a dynamic braking option.
Figure 4.36 illustrates the function of Stall Prevention during deceleration.
4.6 Basic Drive Setup Adjustments
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
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Start-Up Programming & Operation