YASKAWA F7 User Manual page 125

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If L3-04=2, the intelligent stall prevention function is enabled. The active deceleration time is used as a starting point and the
Drive will attempt to decelerate as quickly as possible without causing the DC Bus voltage to exceed the stall prevention level.
The fastest time possible is 1/10 the active deceleration time.
If L3-04=3, the stall prevention with braking resistor function is enabled. The DC bus voltage level is controlled during fast
deceleration and allows for a faster than normal deceleration time. Use this setting with a braking resistor when overvoltage
fault (OV) sometimes occurs even under settings 1 or 2.
IMPORTANT
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In Flux Vector Control Mode (A1-02=3), setting stall prevention with DB resistor (L3-04=3) cannot be done.
Basic Programming 5 - 24
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