Lenze i550

13.5 Switching frequency changeover
The output voltage of the inverter is a DC voltage with sine-coded pulse width modulaon
(PWM). This corresponds by approximaon to a AC voltage with variable frequency. The fre-
quency of the PWM pulses is adjustable and is called "switching frequency".
Not all products support all opons.
Details
The switching frequency has an impact on the smooth running performance and the noise
generaon in the motor connected as well as on the power loss in the inverter. The lower the
switching frequency, the beer the concentricity factor, the smaller the power loss and the
higher the noise generaon.
Parameter
Address Name / seng range / [default seng] Info
0x2939
(P305.00)
Switching frequency
(Switching freq.)
* Default seng depending on the size.
Selecon of the inverter switching frequency.
Abbreviaons used:
•
"Variable": adaptaon of the switching frequency as a funcon of the
current. The carrier frequency is reduced dependent on the heatsink
temperature and the ixt-load.
•
"Fix.": the carrier frequency is xed, no frequency reducon.
•
"Drive-opmised": reduces the capacive currents from the motor to
the earth.
•
"Min. Pv": increases the capacive currents from the motor to the
earth.
1 4 kHz variable / drive-opmised
2 8 kHz variable / drive-opmised
3 16 kHz variable / drive-opmised
5 2 kHz xed / drive-opmised
6 4 kHz xed / drive-opmised
7 8 kHz xed / drive-opmised
8 16 kHz xed / drive-opmised
11 4 kHz variable / min. Pv
12 8 kHz variable / min. Pv
13 16 kHz variable / min. Pv
15 2 kHz xed / min. Pv
16 4 kHz xed / min. Pv
17 8 kHz xed / min. Pv
18 16 kHz xed / min. Pv
21 8 kHz variable / drive-opmised / 4 kHz min.
22 16 kHz variable / drive-opmised / 4 kHz
min.
23 16 kHz variable / drive-opmised / 8 kHz
min.
31 8 kHz variable /min. Pv / 4 kHz min.
32 16 kHz variable /min. Pv / 4 kHz min.
33 16 kHz variable /min. Pv / 8 kHz min.
0x293A
(P116.00)
Actual switching frequency
(Actual sw. freq.)
•
Read only
Display of the currently acve switching frequency of the inverter.
Example:
•
"16 kHz variable / drive-opmised / 4 kHz min. [22]" is selected as
switching frequency in 0x2939 (P305.00).
•
An increase of the ambient temperature and/or the load have caused
a decrease of the switching frequency to 8 kHz. In this case, this
parameter indicates the selecon "8 kHz power loss-opmised [7]".
1 2 kHz drive-opmised
2 4 kHz drive-opmised
3 8 kHz drive-opmised
4 16 kHz drive-opmised
5 2 kHz power loss-opmised
6 4 kHz power loss-opmised
7 8 kHz power loss-opmised
8 16 kHz power loss-opmised
Device funcons
Switching frequency changeover
510