Siemens SINAMICS S120 Function Manual page 88

Servo control
3.9 V/f control for diagnostics
Structure of V/f control
Figure 3-14
Prerequisites for V/f control
1. First commissioning has been carried out:
2. First commissioning has not been carried out:
Note
With synchronous motors, V/f mode is normally only stable at low speeds. Higher speeds
can induce vibrations.
Commissioning V/f control
1. Verify the preconditions for V/f control mode.
2. Set p0311 –> rated motor speed
3. Set p1317 = 1 –> activates the function
4. Activate the enable signals for operation
5. Specify the speed setpoint –> evaluate the diagnostic function
88
Structure of V/f control
The parameters for V/f control have been initialized with appropriate values.
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
V/f control can now be commissioned.
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions