ABB ACH550-01 User Manual page 246

Code Description
2607 SWITCH FREQ CTRL
Activates the switching frequency control. When active, the selection of
parameter 2606
temperature increases. See the figure below. This function allows the
highest possible switching frequency at a specific operating point.
Higher switching frequency results in lower acoustic noise.
0 = – The function is disabled.
OFF
1 = – The switching frequency is limited according to the figure.
ON
2608 SLIP COMP RATIO
Sets gain for slip compensation (in %).
• A squirrel-cage motor slips under load. Increasing the frequency as
the motor torque increases compensates for the slip.
• Requires parameter 9904
0 = No slip compensation.
1...200 = Increasing slip compensation. 100% means full slip
compensation.
2609 NOISE SMOOTHING
This parameter introduces a random component to the switching
frequency. Noise smoothing distributes the acoustic motor noise over a
range of frequencies instead of a single tonal frequency resulting in
lower peak noise intensity. The random component has an average of
0 Hz. It is added to the switching frequency set by parameter 2606
(
SWITCHING FREQ
12 kHz.
0 =
DISABLE
1 =
ENABLE
234
SWITCHING FREQ
f
sw
limit
12 kHz
8 kHz
4 kHz
80 °C
MOTOR CTRL MODE
). This parameter has no effect if parameter 2606 =
.
ACH550 User's Manual
Range
0=OFF, 1=ON
is limited when the drive internal
R1...R4 drives
R5...R6 drives
temperature
90 °C 100 °C
0...200%
= 3 (
0...1
Parameter listing and descriptions
Drive
T
: ).
SCALAR FREQ