ABB ACS880 - Page 550

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
0.00% / real32Defines the relative output voltage boost at zero speed
(IR compensation). The function is useful in applications
with a high break-away torque where direct torque
control (DTC mode) cannot be applied.
U / U
N
(%)
f (Hz)
Field weakening point
50% of nominal frequency
Relative output voltage
with IR compensation
100%
80.41
Relative output voltage.
No IR compensation.
See also section IR compensation for scalar motor
control .
IR compensation ref80.41
10 = 1% / 100 = 1%Voltage boost at zero speed in percent of nominal
motor voltage.
0.00 ... 50.00%
2.00 Hz / real32IR compensation (ie. output voltage boost) can be used
in step-up applications to compensate for resistive
losses in the step-up transformer, cabling and motor.
As voltage cannot be fed through a step-up transformer
at 0 Hz, a specific type of IR compensation should be
used.
This parameter adds a frequency breakpoint for
parameter 80.41 IR compensation ref as shown below.
U / U
N
(%)
Relative output voltage
with IR compensation
Field weakening point
80.41
80.42
100%
f (Hz)
0.0 Hz = Breakpoint disabled.
Note: This parameter cannot be changed while the
drive is running.
Step up frequency80.42
10 = 1 Hz / 100 = 1 HzIR compensation breakpoint for step-up applications.2.00 ... 300.00 Hz
550 Parameters