Functions and Technical Specifications
4-11
EM 148-FC
Frequency Converter
A5E00065321-03
Control mode
This parameter determines the relationship between the frequency output by the
frequency converter and the voltage.
Linear voltage/frequency characteristic:
Linear voltage rise from the minimum voltage when f = 0 to the rated voltage at
the rated frequency of the motor.
This adjustment ensures an almost constant torque until the rated operating
speed is reached.
Quadratic voltage/frequency characteristic:
A slow increase in voltage at the start and therefore reduced torque.
This adjustment is particularly suitable for machines such as rotary pumps or
fans, since these have a perfect squared torque/frequency curve.
0
U
N
A
f
f
N
Figure 4-1
Linear and quadratic voltage/frequency characteristic
Содержание SIMATIC EM 148-FC
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Страница 66: ...Mode of Functioning 5 10 EM 148 FC Frequency Converter A5E00065321 03 ...
Страница 70: ...Dimensioned Drawing B 2 EM 148 FC Frequency Converter A5E00065321 03 ...
Страница 76: ...4 Product Information on Manual EM 148 FC Frequency Converter Edition 04 2003 A5E00476687 03 ...