Siemens SINAMICS S120 Function Manual page 113

Commission V/f control
1. Check the requirements for V/f control.
2. Set the rated motor speed via parameter p0311.
3. Activate the function with the parameter setting of p1317 = 1.
4. Set the enables for operation.
5. Specify the speed setpoint.
Note
Automatic activation of additional functions
With p1317 = 1, the following functions are also activated automatically:
• Resonance damping (p1338)
• Vdc controller (p1240, p1244, p1248, p1250)
• Limitation of the up ramp as a result of M, P and I limits
• As soon as the current limit p0640 is exceeded, then the ramp-function generator is
V/f characteristic
The speed setpoint is converted to the frequency specification taking into account the
number of pole pairs. The synchronous frequency associated with the speed setpoint is
output (no slip compensation).
Figure 3-11
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
In order to obtain a pure diagnostic mode without any influence on actual values, the
resonance damping must be deactivated (p1338 = 0)
stopped
V/f characteristic
Servo control
3.9 V/f control
111