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How does the ATV630 Process drives stall function work?

Issue:
How does the ATV630 Process drives stall function work?

Product Line:
Altivar 630, Process drive

Environment:
All

Cause:
Stall function

Resolution:
This function helps to prevent a motor overload by monitoring the motor current and the speed rise time. 
A stalling condition is when: 
An output frequency is smaller than the stalling frequency [Stall Frequency] StP3 
And an output current is higher than the stalling current [Stall Current] StP2 
During a time longer than the stalling time [Stall Max Time] StP1 
That means that you must meet three conditions, then a stalling condition occurs, an [Motor Stall Error] StF error is triggered. 

For example,
Set StP3=10HZ, StP2=100% (meaning rated motor current)
StP1=5s 
When the drive is running at 9.9HZ, motor current is above rated motor current, then after 5S, an [Motor Stall Error] StF error is triggered. 
If the drive is running at 10.1HZ, an StF error is not triggered. 
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