Efficient Networks S120 manual Vector V/f control r0108.2 = 0 5.2 Voltage boost

Vector V/f control (r0108.2 = 0) 5.2 Voltage boost

Parameter	Meaning
values

5Precise frequency drives

6Precise frequency drives with flux current control (FCC)

19Independent voltage setpoint

Application / property

Characteristic that takes into account the technological particularity of an application (e.g. textile applications):

a)whereby the current limitation (Imax controller) only affects the output voltage and not the output frequency, or

b)by disabling slip compensation

Characteristic that takes into account the technological particularity of an application (e.g. textile applications):

a)whereby the current limitation (Imax controller) only affects the output voltage and not the output frequency, or

b)by disabling slip compensation

Voltage losses in the stator resistance for static / dynamic loads are also compensated (flux current control FCC). This is particularly useful for small motors, since they have a relatively high stator resistance.

The user can define the output voltage of the Motor Module independently of the frequency using BICO parameter p1330 via the interfaces (e.g. analog input AI0 of Terminal Board 30 –> p1330 = r4055[0]).

5.2Voltage boost

With an output frequency of 0 Hz, the V/f characteristics yield an output voltage of 0 V. The voltage boost must be entered to:

●Magnetize the induction motor.

●Maintain the load.

●Compensate for the losses (ohmic losses in the winding resistors) in the system

●Generate a breakaway/acceleration/braking torque.

The voltage boost can be increased permanently (p1310) or during acceleration (p1311).

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Figure 5-2 Voltage boost total

Drive Functions	171
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4