Output voltage of the frequency inverter in case of a v/f-rated frequency parameterized in C0015

Question:

What voltage does the frequency inverter output at its output terminals (U, V, W) , when it reaches the v/f-rated frequency (C0015) with its output frequency (C0050)?

Answer:

When the frequency inverter reaches the v/f (C0015) it always outputs its nominal voltage. It is dependent on the type of device (E82xVxxxK2x = 230 V, E82xVxxxK4x = 400 V), but independent from the mains voltage the frequency inverter is supplied with, provided that it is >= the nominal voltage of the frequency inverter.

Example:

The E82EV551K4C frequency inverter is supplied with a mains voltage (Umains) of 500 V. The v/f rated frequency (C0015) is set to 50 Hz.

Due to the type designation of the used drive controller (E82EV551K4C) you can detect that the nominal voltage (Unom) is 400 V. When the frequency inverter reaches the output frequency (C0050) of 50 Hz (= voltage/frequency-nominal frequency C0015), the connected motor is supplied with an output voltage (C0052) of 400 V (see graphic below).

In this example the mains voltage of 500 V leads to a field weakening range beginning with an output frequency of at least  62.5 Hz, as due to the high mains voltage the frequency inverter has a voltage reserve of 100 V above the voltage/frequency nominal point of 50 Hz.

Note:
The formula of the v/f-rated frequency can be found in the manual.