Inovance MD330H - Page 156

MD380 User Manual Desc
ription of Function Codes
- 155 -
Function Code Parameter Name Setting Range Default
F2-13 Excitation adjustment proportional gain 0–20000 2000
F2-14 Excitation adjustment integral gain 0–20000 1300
F2-15 Torque adjustment proportional gain 0–20000 2000
F2-16 Torque adjustment integral gain 0–20000 1300
These are current loop PI parameters for vector control. These parameters are automatically
obtained through "Asynchronous motor complete auto-tuning" or "Synchronous motor no-
load auto-tuning", and need not be modied.
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
proportional gain or integral gain here.
Function Code Parameter Name Setting Range Default
F2-18
Field weakening mode of
synchronous motor
0: No eld weakening
1: Direct calculation
2: Automatic adjustment
1
F2-19
Field weakening depth of
synchronous motor
50%–500% 100%
F2-20 Maximum eld weakening current 1%–300% 50%
F2-21
Field weakening automatic
adjustment gain
10%–500% 100%
F2-22 Field weakening integral multiple 2–10 2
These parameters are used to set eld weakening control for the synchronous motor.
If F2-18 is set to 0, eld weakening control on the synchronous motor is disabled. In this
case, the maximum rotational speed is related to the AC drive bus voltage. If the motor's
maximum rotational speed cannot meet the requirements, enable the field weakening
function to increase the speed.
The MD380 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 F2-19. The smaller the demagnetized
current is, the smaller the total output current is. However, the desired eld weakening
effect may not be achieved.
• In automatic adjustment mode, the best demagnetized current is selected automatically.
This may inuence the system dynamic performance or cause instability.
The adjustment speed of the field weakening current can be changed by modifying the
values of F2-21 and F2-22. A very quick adjustment may cause instability. Therefore,
generally do not modify them manually.