vacon • 89 Parameters
6
6.1.10.3 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 Cur-
rent
) 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.
NOTE! If you use long motor cables (max. 100m) 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.
Table 74. Motor stall protection settings
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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