ABB ACS880 - Motor Control

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
Motor model settings.Motor control97
4.500 kHz / real32
When parameter 97.9 Switching freq mode is set to
Custom, defines the switching frequency when it is not
otherwise being internally limited.
Switching frequency
reference
97.1
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
1000 = 1 kHz / 1000 =
1 kHz
Switching frequency reference.0.000 ... 24.000 kHz
1.500 kHz / real32
When parameter 97.9 Switching freq mode is set to
Custom, defines a minimum switching frequency reference.
Minimum switching
frequency
97.2
The actual switching frequency will not fall below this limit
under any circumstances.
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
Note: The drive has internal switching frequency limits that
may override the value entered here.
1000 = 1 kHz / 1000 =
1 kHz
Minimum switching frequency.0.000 ... 24.000 kHz
100 % / real32Defines the slip gain which is used to improve the estimated
motor slip. 100% means full slip gain; 0% means no slip
Slip gain97.3
gain. The default value is 100%. Other values can be used
if a static speed error is detected despite having the setting
at full slip gain.
Example (with nominal load and nominal slip of 40 rpm):
A 1000 rpm constant speed reference is given to the drive.
Despite having full slip gain (= 100%), a manual tachometer
measurement from the motor axis gives a speed value of
998 rpm. The static speed error is
1000 rpm - 998 rpm = 2 rpm. To compensate the error, the
slip gain should be increased to 105%
(2 rpm / 40 rpm = 5%).
1 = 1 % / 100 = 1 %Slip gain.0...200 %
-2 % / real32Defines the minimum allowed voltage reserve. When the
voltage reserve has decreased to the set value, the drive
enters the field weakening area.
Voltage reserve97.4
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
If the intermediate circuit DC voltage U
dc
= 550 V and the
voltage reserve is 5%, the rms value of the maximum
output voltage in steady-state operation is
0.95 × 550 V / sqrt(2) = 369 V
The dynamic performance of the motor control in the field
weakening area can be improved by increasing the voltage
reserve value, but the drive enters the field weakening area
earlier.
1 = 1 % / 100 = 1 %Voltage reserve.-5...50 %
Parameters 519