Function library
Function blocks
3.5.43 Internal motor control (MCTRL)
3−216
l
EDSVS9332P−EXT DE 2.0
3.5.43.9 Field weakening
The field weakening range does not need to be set if the motor type has been set in C0086. In this
case all settings required are made automatically. The motor is operated in the field weakening mode
if
l the output voltage of the controller exceeds the rated motor voltage set in C0090,
l the controller cannot increase the output voltage with rising speed any more because of the
mains voltage / DC−bus voltage.
Manual field weakening
A manual field weakening is possible via the input MCTRL−FLD−WEAK. For reaching the maximum
excitation this input must be triggered with +100 % (e.g. FIXED100%).
( Stop!
The available torque is reduced by the field weakening.
3.5.43.10 Switching frequency changeover
The switching frequency of the inverter can be selected:
l 8 kHz fixed, for power−optimised operation (C0018 = 1)
– maximum power output of the controller, but with audible pulse operation
l 16 kHz fixed, for noise−optimised operation (C0018 = 2)
– inaudible pulse operation of the controller, but with reduced power output (torque)
l Automatic changeover between power−optimised and noise−optimised operation (C0018 = 0)
Automatic switching frequency changeover
The automatic switching frequency changeover can be used if the drive is to be operated in the
noise−optimised range, but the available torque is not sufficient for acceleration processes.
Condition M = f(I) Function
M < M
N16
(I
N16
) Controller is operated with 16 kHz (noise−optimised)
M
N16
(I
N16
) < M < M
N8
(I
N8
) Controller switches over to 8 kHz (power−optimised)
M > M
max8
(I
max8
) Controller operates with 8 kHz in the current limitation
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