Un
U[V]
f[Hz]
Nominal
voltage of the motor
Linear
Squared
Field
weakening
point
Nominal frequency
of the motor
Fig. 13: Linear and squared change of the motor voltage
P3.1.2.15 OVERVOLTAGE CONTROL (ID 607)
Use this parameter to set the overvoltage controller out of operation.
See the description in P3.1.2.16 Undervoltage Control.
P3.1.2.16 UNDERVOLTAGE CONTROLLER (ID 608)
Use this parameter to set the undervoltage controller out of operation.
When you enable P3.1.2.15 or P3.1.2.16, the controllers start to monitor the changes in the
supply voltage. The controllers change the output frequency if it becomes too high or too low.
To stop the operation of the undervoltage and the overvoltage controllers, disable these 2
parameters. This is useful if the supply voltage changes more than -15% to +10%, and if the
application does not tolerate the operation of the controllers.
P3.1.2.17 STATOR VOLTAGE ADJUST (ID 659)
Use this parameter to adjust the stator voltage in permanent magnet motors.
It is possible to use this parameter only when the parameter P3.1.1.8 Motor Type has the
value PM motor. If you set induction motor as the motor type, the value is automatically set to
100%, and you cannot change the value.
When you change the value of P3.1.1.8 (Motor type) to PM Motor, the U/f curve will increase
automatically to be equal with output voltage of the drive. The set U/f ratio does not change.
PARAMETER DESCRIPTIONS
VACON · 115
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