ABB ACS350 User Manual page 194

194
Parameters – complete descriptions
Index Name/Selection
2607 SWITCH FREQ CTRL Activates the switching frequency control. When active, the selection of
OFF
ON
2608 SLIP COMP RATIO
0...200%
2609 NOISE SMOOTHING
DISABLE
ENABLE
2610 USER DEFINED U1
0...120% of U V
N
2611 USER DEFINED F1
0.0...500.0 Hz
2612 USER DEFINED U2
0...120% of U V
N
Actual signals and parameters
Description
parameter 2606 SWITCHING FREQ is limited when the drive internal
temperature increases. See the figure below. This function allows the highest
possible switching frequency at a specific operation point.
Higher switching frequency results in lower acoustic noise, but higher internal
losses.
f
sw
limit
16 kHz
4 kHz
80...100°C *
* Temperature depends on the drive output frequency.
Inactive
Active
Defines the slip gain for the motor slip compensation control. 100% means
full slip compensation, 0% means no slip compensation. Other values can be
used if a static speed error is detected despite of the full slip compensation.
Can be used only with scalar control (i.e. when parameter
CTRL MODE setting is SCALAR:FREQ).
Example: 35 Hz constant speed reference is given to the drive. Despite of the
full slip compensation (SLIP COMP RATIO = 100%), a manual tachometer
measurement from the motor axis gives a speed value of 34 Hz. The static
speed error is 35 Hz - 34 Hz = 1 Hz. To compensate the error, the slip gain
should be increased.
Slip gain
Enables the noise smoothing function. Noise smoothing distributes the
acoustic motor noise over a range of frequencies instead of a single tonal
frequency resulting in lower peak noise intensity. A random component with
an average of 0 Hz is added to the switching frequency set by parameter
2606 SWITCHING FREQ.
Note: Parameter has no effect if parameter
to 16 kHz.
Disabled
Enabled
Defines the first voltage point of the custom U/f curve at the frequency
defined by parameter 2611
ratio on page 112.
Voltage
Defines the first frequency point of the custom U/f curve.
Frequency
Defines the second voltage point of the custom U/f curve at the frequency
defined by parameter 2613
ratio on page 112.
Voltage
Drive
temperature
100...120°C *
2606 SWITCHING FREQ is set
USER DEFINED F1. See section
USER DEFINED F2. See section
Def, FbEq
ON
T
0
1
0
9904 MOTOR
1 = 1%
DISABLE
0
1
19% of U
Custom U/f
1 = 1 V
10
1 = 0.1 Hz
38% of U
Custom U/f
1 = 1 V
N
N