Motor Control - ABB ACS880-x04 Firmware Manual

No. Name/Value
97

97 Motor control

97.01 Switching
frequency reference
0.000 ...
24.000 kHz
97.02 Minimum switching
frequency
0.000 ...
24.000 kHz
97.03 Slip gain
0 ... 200%
97.04 Voltage reserve
-4 ... 50%
97.05 Flux braking
Disabled
Description
Motor model settings.
When parameter 97.09 Switching freq mode
defines the switching frequency when it is not otherwise being
internally limited.
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
Switching frequency reference.
When parameter 97.09 Switching freq mode
defines a minimum switching frequency reference. The actual
switching frequency will not fall below this limit under any
circumstances.
Notes:
• This is an expert level parameter and should not be
adjusted without appropriate skill.
• The drive has internal switching frequency limits that may
override the value entered here.
Minimum switching frequency.
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.
Defines the level of flux braking power. (Other stopping and
braking modes can be configured in parameter group
Start/stop mode).
See section Flux braking
Note: This is an expert level parameter and should not be
adjusted without appropriate skill.
Flux braking is disabled.
is set to Custom,
is set to Custom,
= 550 V and the
dc
(page 62).
Parameters 429
Def/FbEq16
4.500 kHz
1000 = 1 kHz
1.500 kHz
1000 = 1 kHz
100%
1 = 1%
-2%
1 = 1%
Disabled
21
0