Lenze EVF9333−xV - Manual (Page 223)

Commissioning
Switching frequency of the inverter
6
6.9
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6.9−1 EDSVF9333V EN 6.2−04/2012
6.9 Switching frequency of the inverter
The switching frequency of the inverter influences the smooth running
behaviour, the power loss in the controller and the noise generation in the
connected motor. The Lenze setting is the optimum value for standard
applications. General rule:
The lower the switching frequency the
ƒ lower the power loss.
ƒ higher the noise generation.
ƒ better the concentricity factor.
You can select between two switching frequency modes:
Code sine−wave modulated (sin) flat top modulated (f_top)
C0018 0, 1, 4, 5, 6 2, 3
)
Note!
ƒ In the flat top modulation, the concentricity factor at low
speeds is lower than in the sine−wave modulation. For most
standard applications a sine−wave modulated switching
frequency is optimal.
ƒ The maximum output frequency of the controller depends on
the selected switching frequency (see C0018).
ƒ When C0018 = 0 and C0018 = 6, the switching frequency is
automatically changed over depending on the output current
of the controller.
ƒ Please note that for operation with high switching frequencies
the output current must be reduced to prevent the controller
from being heated inadmissibly (derating).
ƒ Adapt the current limit values (C0022 and C0023) so that the
currents listed in the technical data are not exceeded.
In addition you can set to change over to a lower switching frequency when
the heatsink temperature reaches an adjustable limit value. This serves to
prevent the drive from being inhibited by the error "overtemperature" and
the motor coasts without torque.
Description