Vacon 100 hvac Applications Manual page 124

VACON · 124
U[V]
Un
ID603
Default: Nominal
voltage of the motor
Fig. 12: Linear and squared change of the motor voltage
P3.1.2.15 OVERVOLTAGE CONTROL (ID607)
See the description in P3.1.2.16 Undervoltage Control.
P3.1.2.16 UNDERVOLTAGE CONTROLLER (ID608)
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 (ID659)
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.
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.
9
Linear
Squared
PARAMETER DESCRIPTIONS
Field
weakening
point
Default:
Nominal frequency
of the motor
ID602
TEL. +358 (0)201 2121 · FAX +358 (0)201 212 205
f[Hz]