Danfoss VACON 100 FLOW Series Application Manual page 172

VACON® 100 FLOW
Application Guide
Selec- Selection Description
tion name
num-
ber
0 Linear The voltage of the motor changes linearly as a function of the output frequency. The voltage changes
from the value of P3.1.4.6 (Zero Frequency Voltage) to the value of P3.1.4.3 (Voltage at Field Weakening
Point) at a frequency set in P3.1.4.2 (Field Weakening Point Frequency). Use this default setting if a dif-
ferent setting is not necessary.
1 Squared The voltage of the motor changes from the value of P3.1.4.6 (Zero Frequency Voltage) to the value of
P3.1.4.2 (Field Weakening Point Frequency) at a squared curve. The motor operates undermagnetized
below the field weakening point and produces less torque. Use the squared U/f ratio in applications
where the torque demand is in relation to the square of the speed, for example in centrifugal fans and
pumps.
2 Program- It is possible to program the U/f curve with 3 different points: the zero frequency voltage (P1), the mid-
mable point voltage/ frequency (P2), and the field weakening point (P3). Use the programmable U/f curve at
low frequencies if it is necessary to have more torque. Use the identification run (P3.1.2.4) to find the
optimal settings automatically.
U[V]
Un
ID603
A
Illustration 37: Linear and Squared Change of the Motor Voltage
A Default: Nominal voltage of the motor
B Field weakening point
C Linear
172 | Danfoss A/S © 2023.08
C D
B
E
ID602
D Squared
E Default: Nominal frequency of the motor
AB298035655957en-000201 / DPD01083
Parameter Descriptions
f[Hz]