Lenze i950 Series, Manual, Page: 239 / 500

13.4 V/f characteristic control for asynchronous motor (VFC open loop)
The V/f characteristic control is a motor control for conventional frequency inverter applica-
tions. It is based on a simple and robust control mode for the operation of asynchronous
motors with a linear or square-law load torque characteristic (e.g. fan). Because of the mini-
mal parameterisation effort, such applications can be commissioned easily and quickly.
Preconditions
•
The V/f characteristic control is only suitable for asynchronous motors.
•
If you want to actuate a drive with a square-law V/f characteristic: Please always check
whether the corresponding drive is suitable for operation with a square-law V/f character-
istic!
•
Set the motor data according to the information on the nameplate of the motor.
4
Motor
data
^
38
13.4.1 Required commissioning steps
1 . Check wiring by means of manual test modes.
4
Testing the motor control
^
301
2
.
Activate motor control type: 0x2C00 = "V/f characteristic control (VFC open loop) [6]".
3
.
Set limiting factors for the V/f characteristic:
1
.
0x2540:001 , Rated mains voltage
2 .
0x2B01:001 , Base voltage
3
.
0x2B01:002 , Base frequency
4 . Set and optimise current controller
4
Current controller .
^
267
Setting and optimising the current controller is only required if at least one of the following
functions is active:
• Voltage vector control
4
Activate voltage vector control (Imin controller)
^
243
•
DC braking
4
DC braking
^
251
•
Flying restart function
4
Flying restart circuit
^
249
5 . Select a characteristic shape suitable for the application
4
Define V/f characteristic shape .
^
241
6 .
Set voltage boost
^
245
7
.
Activate voltage vector control (Imin controller)
^
243
8 .
Imax controller
^
272
9
.
Optional
4
Set load adjustment
^
246
10
.
Optional
4
Flying restart circuit
^
249
11 . Optional
4
Set slip compensation
^
246
12
. Optional
4
Set oscillation damping
^
247
Configuring the motor control
V/f characteristic control for asynchronous motor (VFC open loop)
Required commissioning steps
239