Lust CDA3000 - Page 123

Application Manual CDA3000
5-9
5 Software functions
1
2
3
4
5
6
A
DE
EN
FR
Setting of mass moment of inertia of system (160-SCJ1,
162-SCJ2)
The mass moment of inertia of the system must be entered under param-
eters 160-SCJ1 (CDS1) and 162-SCJ2 (CDS2) in order to ensure opti-
mum running in control mode SFC/FOR.
If no mass moment of inertia is entered for the system, a 1:1 adjustment
of the mass moment of inertia is assumed and the mass moment of iner-
tia of the system is set equal to that of the motor.
Reduction of the mass moment of inertia of the system
J
M
= Mass moment of inertia of the motor (MOJNM)
J
red
= Reduced mass moment of inertia of system (SCJx)
i Transmission ratio
Figure 5.2 Reduction of mass moment of inertia
Note: Abovearatioof1:5(J
M
:J
red
) the mass moment of inertia of
the application must be specified, otherwise the control
response will not be stable.
Note: Specification of the mass moments of inertia is of signifi-
cance for control modes SFC and FOR. The speed controller
is set on the basis of the mass moments of inertia during
auto-tuning (see section 6.2 “Sensorless Flux Control” and
6.3 “ Field Oriented Regulation”).
M
3 ~
n
1
n
2
J
M
J
red
J
2i
J
red
=
J
2
i
2
=
J
2
n
1
n
2
()
2