6.2.15.1 Voltage frequency operation
This operation mode is intended for an easy start-up.
The v/f operation is defined by these parameters:
The voltage-frequency characteristic is defined by 3 voltage /frequency pairs:
• The voltage at frequency 0 Hz is defined with dr45 ASM v/f boost.
• An additional point of support for the characteristic can be set with dr46
ASM v/f V1 and dr47 ASM v/f F1
• dr05 rated voltage and dr06 rated frequency define the rated point of the
voltage frequency characteristic.
The dr48 v/f characteristic mode defines how the characteristic is calculated and
which is the reference value for the percentage voltage specifications.
The DC link voltage compensation and the maximum modulation level also influ-
ence the voltage/frequency characteristic.
A superimposed control can adapt the voltage online via process data with param-
eter mo32. After power off/on, mo32 is zero again.
The rated motor speed (dr04 rated speed) is required to calculate the number of
pole pairs. Since all setpoint specifications must be made in revolutions per minute,
the required frequency is only reached if dr04 is correctly parameterized.
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