Lenze i950

13.4 V/f
characterisc control for asynchronous motor (VFC open loop)
The V/f characterisc control is a motor control for convenonal frequency inverter applica-
ons. It is based on a simple and robust control mode for the operaon of asynchronous
motors with a linear or square-law load torque characterisc (e.g. fan). Because of the mini-
mal parameterisaon eort, such applicaons can be commissioned easily and quickly.
Precondions
•
The V
/f characterisc control is only suitable for asynchronous motors.
•
If y
ou want to actuate a drive with a square-law V/f characterisc: Please always check
whether the corresponding drive is suitable for operaon with a square-law V/f character-
isc!
•
Se
t the motor data according to the informaon on the nameplate of the motor. 4Mot
or
data ^ 38
13.4.1 Required commissioning steps
1.
Check wiring b
y means of manual test modes. 4
Tesng the motor control ^ 301
2.
Acvate motor control type: 0x2C00 = "V/f characterisc control (VFC open loop) [6]".
3.
Set
liming factors for the V/f characterisc:
1.
0x2540:001, Ra
ted mains voltage
2.
0x2B01:001, Base voltage
3.
0x2B01:002, Base frequency
4.
Set and opmise current controller 4Curr
ent controller. ^ 267
Seng and opmising the current controller is only required if at least one of the following
funcons is acve:
•
V
oltage vector control 4
Acvate voltage vector control (Imin controller) ^ 243
•
DC braking 4DC braking ^ 251
•
Flying restart funcon4Flying r
estart circuit ^ 249
5.
Select a characterisc shape suitable for the applicaon 4Dene V/f characterisc shape.
^ 241
6.
Set voltage boost ^ 245
7.
Acvate voltage vector control (Imin controller) ^ 243
8.
Ima
x controller ^ 272
9.
Oponal4Se
t load adjustment ^ 246
10.
Oponal4Flying r
estart circuit ^ 249
11.
Oponal4Set slip compensaon ^ 246
12.
Oponal4Se
t oscillaon damping ^ 247
Conguring the motor control
V
/f characterisc control for asynchronous motor (VFC open loop)
Required commissioning steps
239