4 activating voltage vector control, Activating voltage vector control, Voltage vector control – Lenze E94AxPExxxx User Manual
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Motor interface
6.6
V/f control (VFCplus)
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Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
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6.6.1.4
Activating voltage vector control
The Voltage Vector Control (VCC), which can be activated, is an alternative to the voltage boost. The
voltage vector control is used if a high starting torque has to be ensured. The voltage vector control
ensures that the motor current required for this purpose is available in the zero speed range.
The voltage vector control is activated by defining a current setpoint in
and can be
deactivated again by setting "0.0 A".
• The voltage vector control is additive to the voltage boost.
• When the current setpoint is defined, provide a reserve of 20 % to prevent a motor stalling
caused by sudden additional loads.
• Example for starting torque = rated motor torque:
The current setpoint must be parameterised in
to approx. 120 % of the load current.
Setting of the controller parameters
For the gain (
) and the reset time (
), accept the values that have been detected for
the current controller gain (
) and reset time (
Since the voltage vector control controls the current value which has a higher background noise due
to its calculation, the reset time might possibly be increased.
Short overview: Parameters for voltage vector control
Tip!
For controllers with a power > 55 kW we recommend to use the voltage vector control for
horizontal drives for improving the smooth running characteristics.
Note!
A disadvantage of the voltage vector control is the increased current at low speeds. This
causes higher losses and thus an increased heating of the machine.
Parameter
Info
Lenze setting
Value Unit
VFC: VVC current setpoint
0.00 A
VFC: VVC gain
0.00 V/A
VFC: VVC reset time
2000.00 ms