Danfoss VACON 3000 Application Manual page 194

VACON® 3000
Application Guide
Parameter
P3.1.4.2 (Field Weakening Point Frequency)
P3.1.4.3 (Voltage at Field Weakening Point)
7.135 (ID 655) Maximum Modulation Index
Location in the menu:
• INU application: P3.1.2.6.5
This parameter can be used to control how the drive modulates the output voltage.
Reducing this value limits the maximum output voltage. If a sinusoidal filter is used set this parameter to 96%.
Higher DC link use increases current harmonics.
7.136 (ID 656) Load Drooping Time
Location in the menu:
• INU application: P3.1.2.4.7
Use this parameter to set the drooping time of the motor. Use load drooping to get a dynamic speed drooping when the load
changes. This parameter gives the time during which the speed is restored 63% of the change.
7.137 (ID 657) Current Control Time
Location in the menu:
• INU application: P3.1.2.3.2
• AFE application: P3.2.2.2
Use this parameter to adjust the integrator time constant of the current controller. This value is presented in seconds.
7.138 (ID 659) Stator Voltage Adjust
Location in the menu:
•
INU application: P3.1.2.7.4
Use this parameter to adjust the stator voltage in permanent magnet motors.
The identification run sets a value for this parameter automatically. If possible, make the identification run. You can make the
identification run with the parameter ID 631.
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) 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 Stator Voltage Adjust parameter 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 increa-
ses the more the U/f curve is different from the back-EMF curve.
194 | Danfoss A/S © 2021.09
Induction motor (IM)
Motor nominal frequency
100.0%
N O T I C E
Parameter descriptions
AB319735759636en-000101 / DPD01822