Vacon 100 - Page 228

P3.1.2.10 OVERVOLTAGE CONTROL (ID 607)
See the description in P3.1.2.11 Undervoltage Control.
P3.1.2.11 UNDERVOLTAGE CONTROL (ID 608)
When you enable P3.1.2.10 or P3.1.2.11, 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.
P3.1.2.13 STATOR VOLTAGE ADJUST (ID 659)
NOTE!
The identification run sets a value for this parameter automatically. We
recommend that you make the identification run, if it is possible. You can make the
identification run with the parameter P3.1.2.4.
It is possible to use this parameter only when the parameter P3.1.2.2 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 P3.1.2.2 (Motor type) to PM Motor, the parameters P3.1.4.2
(Field Weakening Point Frequency) and P3.1.4.3 (Voltage at Field Weakening Point) will
increase automatically to be equal with output voltage of the drive. The set U/f ratio does not
change. This is done to prevent the operation of the PM motor in the field weakening area.
The nominal voltage of the PM motor is much lower than the full output voltage of the drive.
The nominal voltage of the PM motor agrees to the back-EMF voltage of the motor at
nominal frequency. But in a different motor manufacturer, it can be equal to, for example,
the stator voltage at nominal load.
Stator Voltage Adjust helps you to adjust the U/f curve of the drive near the back-EMF curve.
It is not necessary to change the values of many U/f curve parameters.
The parameter P3.1.2.13 gives the output voltage of the drive in percentage of the nominal
voltage of the motor at the nominal frequency of the motor. Adjust the U/f curve of the drive
above the back-EMF curve of the motor. The motor current increases the more the U/f curve
is different from the back-EMF curve.
VACON · 228 PARAMETER DESCRIPTIONS
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