Motor Control - ABB ACS560 Firmware Manual

No. Name/Value
0000h...FFFFh
97

97 Motor control

97.01 Switching
frequency reference
2 kHz
4 kHz
8 kHz
12 kHz
97.02 Minimum switching
frequency
1.5 kHz
2 kHz
4 kHz
8 kHz
12 kHz
97.03 Slip gain
0...200%
97.04 Voltage reserve
-4...50%
Description
Selection of actions to be prevented by user lock.
Switching frequency; slip gain; voltage reserve; flux braking;
anti-cogging (signal injection); IR compensation.
Defines the switching frequency of the drive that is used as
long as the drive does not heat too much. See section
Switching frequency on page 72.
Higher switching frequency results in lower acoustic noise-
Notes
• If you have a multimotor system, contact your local ABB
representative.
• 2 kHz option is not available in R0...R2 frames.
2 kHz
4 kHz
8 kHz
12 kHz
Lowest switching frequency that is allowed. Depends on the
frame size.
1.5 kHz (available only in R0...R2 frames)
2 kHz.
4 kHz.
8 kHz.
12 kHz
Defines the slip gain which is used to improve the estimated
motor slip. 100% means full slip gain; 0% means no slip 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%).
Slip gain.
Defines the minimum allowed voltage reserve. When the
voltage reserve has decreased to the set value, the drive
enters the field weakening area.
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
If the intermediate circuit DC voltage U
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.
Voltage reserve.
Parameters 361
= 550 V and the
dc
Def/FbEq16
-
4 kHz
2
4
8
12
1.5 kHz
1.5
2
4
8
12
100%
1 = 1%
-2%
1 = 1%