Group 3.9.3: Motor Stall
The motor stall protection protects the motor from
short time overload situations such as one caused by
a stalled shaft. The reaction time of the stall
protection can be set shorter than that of motor
thermal protection. The stall state is defined with two
parameters, P3.9.3.2 (Stall Current) and P3.9.3.4
(Stall Freq. Limit). If the current is higher than the set
limit and the output frequency is lower than the set
limit the stall state is true. There is actually no real
indication of the shaft rotation. Stall protection is a
type of overcurrent protection.
If you use long motor cables (max. 100 m)
together with small drives (≤ 1.5 kW) the
motor current measured by the drive can
be much higher than the actual motor
current due to capacitive currents in the
motor cable. Consider this when setting up
the stall protection functions.
Code Parameter Min Max Unit Default ID Description
P3.9.3.1 MotorStall Flt 0 3 0 709
0 = No action
1 = Alarm
2 = Fault (Stop according to stop mode)
3 = Fault (Stop by coasting)
P3.9.3.2 Stall Current 0.00 5.2 A 3.7 710
For a stall stage to occur, the current must
have exceeded this limit.
P3.9.3.3 Stall Time Limit 1.00 120.00 s 15.00 711
This is the maximum time allowed for a stall
stage.
P3.9.3.4 Stall Freq. Limit 1.00 P3.3.1.2 Hz 25.00 712
For a stall state to occur, the output frequency
must have remained below this limit for a
certain time.
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English (GB)
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