4-134
Within the constant power region, the stall prevention level in acceleration is shown
as bellows:
Stall prevention level in acceleration (in CH region) =【Stall prevention level in acceleration (08-01)】×【Fbase (01-12)】
Output frequency
08-21 is the limit value that the stall prevention level in CH region is reduced lower than
the required level. Refer to the following figure.
Figure 4.3.68 Stall prevention level and limit in acceleration
Stall prevention selection in deceleration (08-00=xx0xb)
Stall prevention in deceleration function will automatically delay the deceleration time
according to the DC voltage to prevent over-voltage in deceleration.
. In deceleration, when DC voltage exceeds the stall prevention level, the deceleration
will stop. When DC voltage is lower than the detection level, it continues to
decelerate.
. Stall prevention level can be set by 08-02, see Table 4.3.13.
Table 4.3.13 Stall prevention level
Inverter model
08-02 default value
(Stall prevention selection in
deceleration, DC current)
220V class, 1 to 10HP 395VDC
220V class, 15HPor above models 385VDC
01-14＜400V 680VDC
01-14 >400V, 1 to 15HP 790VDC
440V class
01-14 >400V, 20 HP or above
models
770VDC
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