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”.
Summary of Contents for speecon 7200ma
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