Parameters 361
0000h…FFFFh Selection of actions to be prevented by user lock. -
97
97 Motor control
Switching frequency; slip gain; voltage reserve; flux braking;
anti-cogging (signal injection); IR compensation.
97.01 Switching
frequency reference
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.
4 kHz
2 kHz 2 kHz 2
4 kHz 4 kHz 4
8 kHz 8 kHz 8
12 kHz 12 kHz 12
97.02 Minimum switching
frequency
Lowest switching frequency that is allowed. Depends on the
frame size.
1.5 kHz
1.5 kHz 1.5 kHz (available only in R0...R2 frames) 1.5
2kHz 2 kHz. 2
4kHz 4 kHz. 4
8kHz 8 kHz. 8
12 kHz 12 kHz 12
97.03 Slip gain 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%).
100%
0…200% Slip gain. 1 = 1%
97.04 Voltage reserve 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
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.
-2%
-4…50% Voltage reserve. 1 = 1%
No. Name/Value Description Def/FbEq16
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