ABB ACS550-01 User Manual page 102

102
Code Description
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 = – The function is disabled.
OFF
1 = – The switching frequency is limited according to the figure.
ON
f
sw
Limit
12 kHz
8 kHz
4 kHz
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 and is added to the switching frequency set by parameter 2606
( ). This parameter has no effect if parameter 2606 = 12 kHz.
SWITCHING FREQ
0 =
DISABLE
1 =
ENABLE
Start-Up
R1...R6 Drives
ACS550
Temperature
80 °C 90 °C 100 °C
= 3 (
MOTOR CTRL MODE
f
sw
R7/R8 Drives
Limit
4 kHz
1 kHz
90 °C
: ).
SCALAR SPEED
ACS550 User's Manual
ACS550
Temperature
100 °C