Page 38 (60) Motor Pump Enhanced Protection Application SV9000
Parameters 7. 10— 7. 13, Stall protection
General
Motor stall protection protects the motor from short time overload situations like a stalled
shaft. The reaction time of stall protection can be set shorter than with motor thermal
protection. The stall state is defined with two parameters: 7.11 Stall Current, and 7.13 Stall
Frequency. If the current is higher than the set limit and 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.
7.10 Stall protection
Operation:
0 = Not in use
1 = Warning
2 = Trip function
Tripping and warning will display the same message code. If tripping is set on, the drive
will stop and activate the fault stage. Setting the parameter to 0 will deactivate the
protection and will reset the stall time counter to zero.
I
f
Par. 7.13
Stall area
Par. 7.11
Figure 6.2-21: Setting the Stall Characteristics
7.11 Stall current limit
The current can be set to 0.0—200% x I
nMotor
.
In a stall state the current is above this limit. See figure 6.2-21. The value is set as a
percentage of the motor's name plate data, parameter 1.13, motor's nominal current. If
parameter 1.13 is adjusted, this parameter is automatically restored to the default value.
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