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VACON® 3000
Application Guide
Above the frequency at the field weakening point, the output voltage stays at the set maximum value. Below the frequency at the
field weakening point, the U/f curve parameters control the output voltage. See the U/f parameters P3.1.4.1, P3.1.4.4 and P3.1.4.5.
When setting the parameters P3.1.1.1 (Motor nominal voltage) and P3.1.1.2 (Motor nominal frequency), the parameters P3.1.4.2 and
P3.1.4.3 automatically receive related values. To have different values for P3.1.4.2 and P3.1.4.3, change these parameters only after
setting the parameters P3.1.1.1 and P3.1.1.2.
7.113 (ID 604) U/f Midpoint Frequency
Location in the menu:
•
INU application: P3.1.4.4
Use this parameter to set the middle point frequency of the U/f curve.
This parameter gives the middle point frequency of the curve if the value of P3.1.4.1 is programmable.
7.114 (ID 605) U/f Midpoint Voltage
Location in the menu:
•
INU application: P3.1.4.5
Use this parameter to set the middle point voltage of the U/f curve.
This parameter gives the middle point voltage of the curve if the value of P3.1.4.1 is programmable.
7.115 (ID 606) Zero Frequency Voltage
Location in the menu:
•
INU application: P3.1.4.6
Use this parameter to set the zero frequency voltage of the U/f curve. The default value for the parameter is different for each unit
size.
7.116 (ID 607) Overvoltage Control
Location in the menu:
•
INU application: P3.1.2.5.1
Use this parameter to set the overvoltage controller out of operation.
The function is necessary when
•
the supply voltage changes, for example, between -15% and +10%, and
•
the process you control does not have the tolerance for the changes that the undervoltage controller and the overvoltage con-
troller make to the output frequency of the drive.
The overvoltage controller increases the output frequency of the drive
•
to keep the DC-link voltage in the permitted limits, and
•
to make sure that the drive does not trip because of an overvoltage fault.
The drive can trip when the overvoltage and undervoltage controllers are disabled.
7.117 (ID 608) Undervoltage Control
Location in the menu:
•
INU application: P3.1.2.5.2
Use this parameter to set the undervoltage controller out of operation.
The function is necessary when
188 | Danfoss A/S © 2021.09
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Parameter descriptions
AB319735759636en-000101 / DPD01822
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