These are current loop PI parameters for vector control. These parameters are automatically
obtained through "Asynchronous motor complete self-learning" or "Synchronous motor nolo-
ad self-learning", and need not be modified.
The dimension of the current loop integral regulator is integral gain rather than integral time.
Note that too large current loop PI gain may lead to oscillation of the entire control loop.
Therefore, when current oscillation or torque fluctuation is great, manually decrease the pro-
portional gain or integral gain here.
-111-
Chapter 6 Description of Function Codes
Function
code
Name
Description
(setting range)
Factory
Default
Change
F03.17
Speed loop integral
property
Units' digit: integral separation
0: invalid
1: valid
0
※
F03.18
Synchronous machine
field weakening mode
0: Field weakening is invalid
1: Direct calculation mode
2: Automatic adjustment mode
0
※
F03.19
Synchronous machine
field weakening depth
50%
~
500%
100%
※
F03.20
Maximum field
weakening current
1%
~
300%
50%
※
F03.21
Field weakening
automatic adjustment
gain
10%
~
500%
100%
※
F03.22
Field weakening
integral multiple
2
~
10
2
※
The provides two field weakening modes: direct calculation and automatic adjustment.
In direct calculation mode, directly calculate the demagnetized current and manually adjust
the demagnetized current by means of F03.19. The smaller the demagnetized
current is, the
smaller the total output current is. However, the desired field weakening effect may not be
achieved.
In automatic adjustment mode, the best demagnetized current is selected automatically. This
may influence the system dynamic performance or cause instability.
The adjustment speed of the field weakening current can be changed by modifying the values
of F03.21 and F03.22. A very quick adjustment may cause instability. Therefore, generally do
not modify them manually.
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