Stall Prevention; L3-04 Stall Prevention During Deceleration Selection - YASKAWA F7 User Manual

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Stall Prevention

L3-04 Stall Prevention During Deceleration Selection

Setting
0
1
2
3
The stall prevention during deceleration function adjusts the deceleration time in order to prevent OV fault trips during
deceleration. If L3-04=0, stall prevention is disabled, and if the load is large and the deceleration time short enough, the Drive
may fault and stop.
If L3-04=1, the standard stall prevention function is enabled. If, during deceleration, the DC Bus voltage exceeds the stall
prevention level (see table below), the Drive will discontinue decelerating and maintain speed. Once the DC Bus voltage has
dropped below the stall prevention level, deceleration will continue. Fig 5.11 demonstrates deceleration when L3-04=1.
Drive Voltage
480Vac
Output
Frequency
DC Bus
Voltage
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240Vac
E1-01 ≥ 400Vac
E1-01 < 400Vac
a a
Basic Programming 5 - 23
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Description
Disabled
General purpose (Enabled) ( factory default )
Intelligent stall prevention (Enabled)
Stall prevention with DB resistor (Enabled)
Stall Prevention Level during Deceleration
b
b
Fig 5.11 Stall Prevention
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380Vdc
760Vdc
660Vdc
a - Set decel time
b - Decel time is extended
t
380/660/760Vdc
t
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