Efficient Networks S120 manual Structure of V/f control, Prerequisites for V/f control

Servo control 3.9 V/f control for diagnostics

Structure of V/f control

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Figure 3-14 Structure of V/f control

Prerequisites for V/f control

1.Initial commissioning has been carried out:

The parameters for V/f control have been initialized with appropriate values.

2.Initial 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

V/f control can now be commissioned.

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

Drive Functions	85
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4