Engineering Guide CDA3000
4-9
4 Software functions
DE
EN
1
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A
4.
Enter moment of inertia of application
4.1
Enter moment of inertia of load
The moment of inertia of the load is necessary in order to attain
an optimum dynamic response with the SFC and FOR control
modes.
If no moment of inertia is specified, the external moment of inertia
is set equal to that of the motor shaft (moment of inertia adapta-
tion J
M
=J
red
).
Calculation of “reduced” moment of inertia on motor shaft
Figure 4.4
Example
➢
In the example the moment of inertia of the load is known:
Select parameter SCJ1 and set to 0.003 kgm²
4.2
Enter motor moment of inertia
If the motor is a standard motor to DIN VDE 0530, it is not neces-
sary to give the moment of inertia of the motor shaft. In the case
of a special motor (e.g. an asynchronous motor) it is required to
optimize the control loop.
