Protective Functions; I 2 T Current Limitation - Faulhaber 22 BX4 SC Series Technical Manual

Description of functions
5.5

Protective functions

2
5.5.1 I t current limitation
2
I t current limitation protects the motor against overheating. A thermal current model
which calculates the motor temperature is created for this purpose. The motor current is
influenced depending on the calculated temperature. The following values are relevant for
2
I t current limitation:
 Peak current (I
The current is limited to the peak current for as long as the thermal current model cal-
culates a non-critical temperature.
Continuous current (I

The current is limited to the continuous current if the thermal model calculates a critical
temperature.
Functionality of the I
The functionality of I
Fig. 19: Example of I
Area I:
 When the motor is started, the peak current is preset as the set value at the current con-
troller.
 As the load (X
peak current (I
The current controller comes into effect and limits the motor current to the peak cur-

rent (I
ture in a thermal current model.
2nd edition, 31-03-2020
):
max
):
cont
2
t current limitation
2
t current limitation is explained below with the aid of an example.
I
I
max
I
cont
T
model
T
crit
2
t current limitation
) increases, the current in the motor becomes higher and higher until the
1
) is reached.
max
). At the same time, the flowing current is used to calculate a model tempera-
max
I II III
X X
1 2
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36
t
t
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