ABB ACS880 Firmware Manual page 426

426 Parameters
No. Name/Value
97.11 TR tuning
25...400%
97.12 IR comp step-up
frequency
0.0 ... 50.0 Hz
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Description
Rotor time constant tuning.
This parameter can be used to improve torque accuracy in
closed-loop control of an induction motor. Normally, the motor
identification run provides sufficient torque accuracy, but
manual fine-tuning can be applied in exceptionally demanding
applications to achieve optimal performance.
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
Rotor time constant tuning.
IR 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
97.13 IR compensation as shown below.
U / U
N
(%)
Relative output voltage with IR
compensation
100%
97.13
97.12 Field weakening
0.0 Hz = Breakpoint disabled.
IR compensation breakpoint for step-up applications.
point
Def/FbEq16
100%
1 = 1%
0.0 Hz
f (Hz)
1 = 1 Hz