User`s manual

75
Stall Prevention Function Chapter 6-3
Set Values • This function will decrease the output frequency if the output current
exceeds the set current value by a minimum of approximately 100 ms so
that the Inverter will continue operating without stalling. The Inverter will
increase the output frequency to return to the set frequency reference
level when the output current is less than the set value.
• The Inverter accelerates or decelerates the output frequency according to
the preset acceleration or deceleration time. (Acceleration time 1: n16,
n17 or acceleration time 2: n18, n19)
• Set the parameter as percentage based on the rated Inverter current as
100%.
• The default setting does not need any changes in normal operation.
• Decrease the set value if the capacity of the motor is smaller than that of
the Inverter or the motor stalls with the default value.
The set value is normally 2 or 3 times higher than the rated current of the
motor. Set this current in percentage based on the rated Inverter current
as 100%.
n57 Stall Prevention during Operation Changes during
operation
No
Setting
range
30 to 200 (%) Unit of
setting
1% Default setting 160
Stall Prevention during Acceleration
Output
current
Output
frequency
n57 (Stall prevention level
during acceleration)
Time
The output frequency is controlled
so that the Inverter will not stall.
Time