Vacon 20 SERIES User Manual

Parameter description vacon • 48
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3
3.9 Motor control
P9.1 FIELD WEAKENING POINT
Output frequency corresponding to max voltage.
Note: if P1.2 Nominal Frequency is changed, P9.1 will be set at same value.
P9.2 F
IELD WEAKENING POINT VOLTAGE
Motor voltage when frequency is above FWP, defined as % of nominal voltage.
Note: if P1.1 Nominal Voltage is changed, P9.2 will be set at 100%.
P9.3 U/
F SELECTION
0: linear
The voltage of the motor changes linearly as a function of output frequency
from zero frequency voltage P9.6 to the field weakening point (FWP)
voltage P9.2 at FWP frequency P9.1 This default setting should be
used if there is no special need for another setting.
Figure 6. Linear and quadratic curve of the motor voltage.
1: quadratic
(from voltage P9.6 at 0Hz, to voltage P9.2 at P9.1 frequency)
The voltage of the motor changes from zero point voltage P9.6 following a squared curve form
from zero to the field weakening point P9.2. The motor runs under-magnetized below the field
weakening point and produces less torque. Squared U/f ratio can be used in applications where
torque demand is proportional to the square of the speed, e.g. in centrifugal fans and pumps.
U[V]
f[Hz]
Default: Nominal
voltage of the motor
Linear
Squared
Field
weakening
point
Default:
Nominal frequency
of the motor

Vacon 20 SERIES Specifications

General

Output Voltage	0 to Input Voltage
Storage Temperature	-40°C to +70°C
Dimensions	Varies by model
Weight	Varies by model
Power Range	0.25 kW to 18.5 kW
Voltage Range	200 V to 480 V
Control Method	Sensorless vector control
Protection Class	IP20
Ambient Temperature	-10°C to +50°C
Communication Options	Modbus, CANopen
EMC Filter	Integrated
STO (Safe Torque Off)	Yes
Input Voltage	208-240 V, 380-480 V
Protection Features	Overvoltage, Undervoltage, Overcurrent, Overtemperature
Operating Temperature	-10°C to +50°C
Humidity	5% to 95% non-condensing