122
R
1
jX
11
R
2
jX
21
I
1
I
2
I
0
X
m
U
1
1-S
S
R
2
Fig.6-11 Equivalent circuit diagram for asynchronous motor in steady state
The R
1
, X
11
, R
2
, X
21
, X
m
, I
o
in Fig.6-11 respectively indicate the stator resistance, stator leakage inductive
reactance, rotator resistance, rotator leakage inductive reactance, mutual inductive reactance and
no-load current. Function code P03.07 is the sum of leakage inductive reactance of the stator and rotator.
If the parameters of the asynchronous motor are known, please write the actual values into
P03.18~P03.22. P03.22 is the no-load current of asynchronous motor. You can directly enter the no-load
current value.
If the motor parameter auto-tuning is conducted, the set values of P03.18~P03.22 will be refreshed after
the normal completion of the auto-tuning.
After changing the power of the asynchronous motor (P03.12), the drive will set the parameters of
P03.14~P03.21 to be the default parameters of the motor.(The rated voltage of motor 1 (P03.13) needs to
be set according to the nameplate by the user).
To provide effective overload protection for motors of different models, it is necessary to adjust the
allowable maximum output current of the drive, as shown in Fig.6-12.
Fig.6-12 Overload protection coefficient setting of motor
The adjustment value can be set according to your need. In the same conditions, if you want to realize
quick protection upon the motor overload, set a small value for P03.23; otherwise, a bigger value shall be
set.
Overload protection coefficient of motor 2
20.0~110.0%
100.0%
P03.23
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