WEG CFW08 Vector inverter User Manual page 97

DETAILED PARAMETER DESCRIPTION
[Factory Setting]
Parameter
(1)
P297
Switching Frequency
(1) This parameter can be changed only with the inverter disabled (motor stopped).
96
Range
Unit Description / Notes
4...7 Defines the switching frequency of the IGBTs in the inveter.
[ 4 - 5kHz ]
-
The switching frequency is a comprimise between the motor acoustic
noise level and the inverters IGBTs losses. Higher switching
frequencies cause lower motor acoustic noise level, but increase
the IGBTs losses, increasing the drive components temperature and
thus reducing their useful life.
The predominant frequency on the motor is twice the switching
frequency setat P297.
Thus, P297=4 (5kHz) results in an audible motor noise corresponding
to 10kHz. This is due to the used PWM technique .
The reduction of the switching frequency also contributes to the
reduction of instability and ressonance that may occur in certain
application conditions, as well as reduces the emission of
electromagnetic energy by the inveter.
The reduction of the switching frequencies also reduces the leakage
currents to ground, which may avoid the nuisance activation of the
ground fault protection (E00).
The option 15kHz (P297=7) is not available in vector control mode.
Use currents according to table below:
Inverter Model
CFW080016S2024...
CFW080016B2024...
CFW080026S2024...
CFW080026B2024...
CFW080040S2024...
CFW080040B2024...
CFW080070T2024...
CFW080073B2024...
CFW080100B2024...
CFW080160T2024...
CFW080010T3848...
CFW080016T3848...
CFW080026T3848...
CFW080027T3848...
CFW080040T3848...
CFW080043T3848...
CFW080065T3848...
CFW080100T3848...
CFW080130T3848...
CFW080160T3848...
Switching
P297
Frequency (f )
sw
4 5kHz
5 2.5kHz
6 10kHz
7 15kHz
2,5kHz 5kHz
(P297=5) (P297=4)
1.6A 1.6A
1.6A 1.6A
2.6A 2.6A
2.6A 2.6A
4.0A 4.0A
4.0A 4.0A
7.0A 7.0A
7.3A 7.3A
10A 10A
16A 16A
1.0A 1.0A
1.6A 1.6A
2.6A 2.6A
2.7A 2.7A
4.0A 4.0A
4.3A 4.3A
6.5A 6.5A
10A 10A
13A 13A
16A 16A
15kHz
10kHz
(P297=6) (P297=7)
1.6A
1.6A
1.6A
1.6A
2.1A
2.6A
2.6A
2.6A
3.4A
4.0A
4.0A
4.0A
6.3A
7.0A
7.3A
7.3A
10A
10A
12A
14A
1.0A
1.0A
1.6A
1.6A
2.3A
2.6A
2.7A
2.7A
3.6A 2.8A
3.0A
3.9A
6.3A
6.5A
6.4A
8.4A
9A
11A
10A
12A