ABB ACS350 Series, User Manual

Page: 194 / 314

Actual signals and parameters
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2607 SWITCH FREQ CTRL Activates the switching frequency control. When active, the selection of
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.
ON
OFF Inactive 0
ON Active 1
2608 SLIP COMP RATIO 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
9904 MOTOR
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.
0
0...200% Slip gain 1 = 1%
2609 NOISE SMOOTHING 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 2606 SWITCHING FREQ is set
to 16 kHz.
DISABLE
DISABLE Disabled 0
ENABLE Enabled 1
2610 USER DEFINED U1 Defines the first voltage point of the custom U/f curve at the frequency
defined by parameter
2611 USER DEFINED F1. See section Custom U/f
ratio on page 112 .
19% of U
N
0...120% of U
N
V Voltage 1 = 1 V
2611 USER DEFINED F1 Defines the first frequency point of the custom U/f curve. 10
0.0...500.0 Hz Frequency 1 = 0.1 Hz
2612 USER DEFINED U2 Defines the second voltage point of the custom U/f curve at the frequency
defined by parameter
2613 USER DEFINED F2. See section Custom U/f
ratio on page 112 .
38% of U
N
0...120% of U
N
V Voltage 1 = 1 V
Parameters – complete descriptions
Index Name/Selection Description Def, FbEq
80...100°C * 100...120°C *
Drive
4 kHz
16 kHz
temperature
f
sw
limit
T
* Temperature depends on the drive output frequency.