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Note 1: When making the above adjustments, increase or decrease settings in steps of
10% or so while checking how things change.
Note 2: Depending on the settings of f207 and f208, the frequency may exceed the
upper-limit frequency if the inverter is set so as to accelerate the load in the
shortest possible time.
Figure 2. 6 Relations of speed response and f207 , f208
NO. Parameter Name Setting Range Default
f209 Stall prevention control coefficient 1
10~250% 100
Use this parameter along with f210 adjusts characteristics in a region in which the
frequency is above the base frequency (region where the field is weak). If a heavy load
is applied instantaneously (or transiently), the motor may stall before the load current
reaches the current set with the stall prevention level 1 parameter (f107). In many cases,
this kind of stall can be avoided by gradually reducing the setting of f209.
NO. Parameter Name Setting Range Default
f210 Stall prevention control coefficient 2
50~150% 100
Using this parameter along with f209 adjusts characteristics in a region in which the
frequency is above the base frequency (region where the field is weak).
* How to make adjustments in a region (region where magnetic field is weak) above the
base frequency:
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General