Function library
7-225
L
EDSVS9332P-D21 EN 3.0
7.5.60.9 Field weakening
The field weakening range does not have to be set if the motor type was set in C0086. All required
settings are done automatically. The motor is operated in the field weakening mode if:
•
The output voltage of the controller exceeds the rated motor voltage set in C0090.
•
The controller is no longer able to increase the output voltage with rising speed due to the
mains voltage or 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.
7.5.60.10 Switching frequency changeover
The switching frequency of the inverter can be selected:
•
8 kHz fixed, for power-optimised operation (C0018 = 1)
– maximum power output of the controller, but with audible pulse operation
•
16 kHz fixed, for noise-optimised operation (C0018 = 2)
– inaudible pulse operation of the controller, but with reduced power output (torque)
•
Automatic changeover between power-optimised and noise-optimised operation (C0018 = 0)
Automatic switching frequency changeover
Theautomaticswitchingfrequencychangeovercanbeusedifthedriveistobeoperatedinthe
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 opera tes with 8 kHz in the current limitation
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