ABB ACS880 Series Firmware Manual page 404

404 Parameters
No. Name/Value
97.10 Signal injection
Disabled
Enabled (5 %)
Enabled (10 %)
Enabled (15 %)
Enabled (20 %)
97.11 TR tuning
25...400%
97.12 IR comp step-up
frequency
0.0 ... 50.0 Hz
Description
Enables the anti-cogging function: a high-frequency
alternating signal is injected to the motor in the low speed
region to improve the stability of torque control. This removes
the "cogging" that can sometimes be seen as the rotor passes
the motor magnetic poles. Anti-cogging can be enabled with
different amplitude levels.
Notes:
• This is an expert level parameter and should not be
adjusted without appropriate skill.
• Use as low a level as possible that gives satisfactory
performance.
• Signal injection cannot be applied to asynchronous
motors.
Anti-cogging disabled.
Anti-cogging enabled with amplitude level of 5%.
Anti-cogging enabled with amplitude level of 10%.
Anti-cogging enabled with amplitude level of 15%.
Anti-cogging enabled with amplitude level of 20%.
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
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.
as shown below.
point
Def/FbEq16
Disabled
0
1
2
3
4
100%
1 = 1%
0.0 Hz
f (Hz)
1 = 1 Hz