WEG CFW08 Vector inverter Plus - Page 97

96
DETAILED PARAMETER DESCRIPTION
Range
[Factory Setting]
Parameter Unit Description / Notes
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:
P297
(1)
4...7
Switching Frequency [ 4 - 5kHz ]
-
Defines the switching frequency of the IGBTs in the inveter.
P297
4
5
6
7
Switching
Frequency (f
sw
)
5kHz
2.5kHz
10kHz
15kHz
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.
(1)
This parameter can be changed only with the inverter disabled (motor stopped).
Inverter Model
CFW080016S2024...
CFW080016B2024...
CFW080026S2024...
CFW080026B2024...
CFW080040S2024...
CFW080040B2024...
CFW080070T2024...
CFW080073B2024...
CFW080100B2024...
CFW080160T2024...
CFW080010T3848...
CFW080016T3848...
CFW080026T3848...
CFW080027T3848...
CFW080040T3848...
CFW080043T3848...
CFW080065T3848...
CFW080100T3848...
CFW080130T3848...
CFW080160T3848...
10kHz
(P297=6)
1.6A
1.6A
2.6A
2.6A
4.0A
4.0A
7.0A
7.3A
10A
14A
1.0A
1.6A
2.6A
2.7A
3.6A
3.9A
6.5A
8.4A
11A
12A
15kHz
(P297=7)
1.6A
1.6A
2.1A
2.6A
3.4A
4.0A
6.3A
7.3A
10A
12A
1.0A
1.6A
2.3A
2.7A
2.8A
3.0A
6.3A
6.4A
9A
10A
2,5kHz
(P297=5)
1.6A
1.6A
2.6A
2.6A
4.0A
4.0A
7.0A
7.3A
10A
16A
1.0A
1.6A
2.6A
2.7A
4.0A
4.3A
6.5A
10A
13A
16A
5kHz
(P297=4)
1.6A
1.6A
2.6A
2.6A
4.0A
4.0A
7.0A
7.3A
10A
16A
1.0A
1.6A
2.6A
2.7A
4.0A
4.3A
6.5A
10A
13A
16A