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102
ACS550 User’s Manual
Start-Up
2607
SW FREQ CTRL
The switching frequency may be reduced if the ACS550 internal temperature rises above a limit. See Figure. This
function allows the highest possible switching frequency to be used based on operating conditions. Higher switching
frequency results in lower acoustic noise.
0 =
OFF
– The function is disabled.
1 =
ON
– The switching frequency is limited according to the figure.
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
MOTOR
CTRL
MODE
=
3 (
SCALAR
:
SPEED
).
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 and is added to the switching frequency set by parameter 2606
(
SWITCHING
FREQ
). This parameter has no effect if parameter 2606 = 12 kHz.
0 =
DISABLE
1 =
ENABLE
Code Description
90 °C
100 °C
ACS550
1 kHz
Temperature
80 °C
100 °C
ACS550
4 kHz
12 kHz
Temperature
R7/R8 Drives
f
sw
Limit
R1…R6 Drives
f
sw
Limit
8 kHz
90 °C
4 kHz