Servo control
4.10 V/f control
Drive functions
138 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
1. Check the requirements for V/f control.
– First commissioning has been carried out:
The parameters for V/f control have been initialized with appropriate values.
– First commissioning has not been carried out:
The following relevant motor data must be checked and corrected:
r0313 Motor pole pair number, actual (or calculated)
p0314 Motor pole pair number
p1318 V/f control ramp-up/ramp-down time
p1319 V/f control voltage at zero frequency
p1326 V/f control programmable characteristic frequency 4
p1327 V/f control programmable characteristic voltage 4
p1338[0...n] V/f mode resonance damping gain
p1339[0...n] V/f mode resonance damping filter time constant
p1349[0...n] V/f mode resonance damping maximum frequency
2. Set the rated motor speed via parameter p0311.
3. Activate V/f control with the parameter setting of p1317 = 1.
Note
Automatic activation of additional functions
With p1317 = 1, the following functions are also activated automatically:
Resonance damping (p1338)
In order to obtain a pure diagnostic mode without any influence on actual values, the
resonance damping must be deactivated (p1338 = 0)
Vdc controller (p1240, p1244, p1248, p1250)
Limitation of the up ramp as a result of M, P and I limits
The ramp-function generator is stopped as soon as the current limit p0640 is
exceeded.
4. Issue the enable signals for operation.
5. Enter the speed setpoint.
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