4-172
Figure 4.4.57 Stall prevention during acceleration
If the motor is used in the constant power (CH) region, the stall prevention level (08-01) is automatically
reduced to prevent the stall.
Stall prevention level during acceleration (Constant horsepower)
Stall Prev. Lev. Acceleration (CH) = Stall prevention level in acceleration (08-01) x Fbase (01-12)
Output frequency
Parameter 08-21 is the stall prevention limit value in Constant Horsepower region. Refer to Fig.4.4.58.
Figure 4.4.58 Stall prevention level and limit in acceleration
Stall prevention selection during deceleration (08-00=xx0xb)
Stall prevention during deceleration automatically increases the deceleration time according based on the
DC-bus voltage to prevent over-voltage during deceleration. Refer to Fig.4.4.59 for stall prevention during
deceleration
When the DC-bus voltage exceeds the stall prevention level deceleration will stop and the inverter will wait
for the DC-bus voltage to fall below the stall prevention level before continuing deceleration. Stall
prevention level can be set by 08-02, see Table 4.4.10.
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