ABB ACS560 - Page 363

Parameters 363
97.13 IR compensation Defines the relative output voltage boost at zero speed (IR
compensation). The function is useful in applications with a
high break-away torque where vector control cannot be
applied.
See also section IR compensation for scalar motor control on
page 66.
Typical IR compensation values are shown below.
WARNING! Set IR compensation value as low as
possible. Large IR compensation value can lead to
overheating of the motor and damage to the drive, if
operated for longer periods at low speed.
3.50%
0.00…50.00% Voltage boost at zero speed in percent of nominal motor
voltage.
1 = 1%
97.20 U/F ratio Selects the form for the U/f (voltage to frequency) ratio below
field weakening point. For scalar control only.
Linear
Linear Linear ratio for constant torque applications. 0
Squared Squared ratio for centrifugal pump and fan applications.
With squared U/f ratio the noise level is lower for most
operating frequencies.
1
No. Name/Value Description Def/FbEq16
U / U
N
(%)
f (Hz)
Field weakening point
Relative output voltage. No
IR compensation.
Relative output voltage. IR
compensation set to 15%.
15%
100%
50% of nominal
frequency
3-phase 380…415V drives
P
N
(kW) 0, 37 0, 75 1, 1 2, 2 4 7, 5 15 37 132
IR
compen
-sation
(%)
3, 5 3, 5 3, 2 2, 5 2 1, 5 1.3 1.1 0.6