Lenze E82xVxxxKxxxxx - Manual (Page 270)

Function library
Optimising the operating behaviour
Inverter switching frequency
10
l
270 EDS82EV903 EN 3.0
10.3.2 Inverter switching frequency
Description
The switching frequency of the inverter influences the smooth running performance, the
power loss inside the controller, and the noise generation in the connected motor. The
Lenze setting of 8 kHz is the optimum value for standard applications. The following
general rule applies:
The lower the switching frequency the
ƒ lower the power loss.
ƒ higher the noise generation.
Moreover you can determine whether the switching frequency is changed over to 4 kHz if
the heatsink temperature only amounts to approx. 5 °C below the permissible maximum
temperature. This serves to prevent the drive from being inhibited by the
"overtemperature" error and the motor from coasting without torque.
)
Note!
Note that when operating with a switching frequency of 16 kHz the output
current must be reduced to prevent the controller from being overheated
(derating).
The current limit values (C0022 and C0023) must be adapted so that the
currents given in the technical data will not be exceeded.
Codes for parameter setting
Code Possible settings IMPORTANT
No. Name Lenze Selection
C0018
v
Switching
frequency 2 0 2 kHz sin General rule:
The lower the switching frequency
the
l lower the power loss
l higher the noise generation
Only operate mid−frequency
motors at 8 kHz sin or 16 kHz sin
(C0018 = 2 or 3)!
^ 270
1 4 kHz sin
2 8 kHz sin
low noise
generation
3 16 kHz sin
C0018
v
Switching
frequency
(only 8200 vect
or 15 ... 90 kW) 6 0 2 kHz sin General rule:
The lower the switching frequency
the
l lower the power loss
l higher the noise generation
Only operate mid−frequency
motors at 8 kHz sin or 16 kHz sin
(C0018 = 2 or 3)!
^ 270
1 4 kHz sin
2 8 kHz sin low noise
generation
3 16 kHz sin
4 2 kHz
low power loss
5 4 kHz
6 8 kHz
7 16 kHz
8 1 kHz sin
9 ... 11 Reserved
12 1 kHz low power loss