52
(19) Stall Prevention Level During Acceleration (Cn-25)
(20) Stall Prevention Level During Running (Cn-26)
•A stall occurs if the rotor can not keep up with the rotating electromagnetic field in
the motor stator side when a large load is applied or a sudden acceleration or
deceleration is performed. In this case, the inverter should automatically adjust the
output frequency to prevent stall.
•The stall prevention function can be set independently for accelerating and
running.
•Stall Prevention During Acceleration : See Fig. 24. Stop acceleration if Cn-25
setting is exceeded. Accelerate again when the current recovers.
•Stall Prevention During running : See Fig. 25. Deceleration is started if the run
stall prevention level Cn-26 is exceeded, especially when an impact load is applied
suddenly. Accelerate again when the current level is lower than Cn-26.
Time
Load
current
Time
Output
frequency
The output frequency is
controlled to prevent stalling
Cn-25
Time
Load
current
Time
Output
frequency
The output frequency
decreases to prevent stalling
Deceleration time
upon Bn-02, Bn-04
Cn-26
Fig. 24 Acceleration stall prevention
function
Fig. 25 Run stall prevention function
•Set the parameters Cn-25 and Cn-26 as a percentage of inverter rated current
(100% corresponds to inverter rated current).
•See page 77 for stall prevention function selection.
(21) Communication Fault Detection Time (Cn-27)
•Please refer to “7200MA MODBUS/PROFIBUS Application Manual”.
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