9
Scalar Control (V/f)
9-6 | CFW700
P0145 – Field Weakening Speed
P0146 – Intermediate Speed
Adjustable
Range:
0 to 18000 rpm
Factory
Setting:
P0145 = 1800 rpm
P0146 = 900 rpm
Properties:
Adj and cfg
Access groups
via HMI:
Description:
This function allows the adjustment of the curve that links output voltage and frequency by means of parameters,
as presented by the
, in V/f mode.
It is necessary when the used motor has a rated frequency different from 50 Hz or 60 Hz, or when a quadratic
V/f curve, for energy saving in the operation of centrifuge pumps and fans, is desired, or even in special
applications, such as, for instance, when a transformer is used at the inverter output, between it and the motor.
The function is activated with P0202=2 (Adjustable V/f).
The factory setting of P0144 (8.0 %) is adequate for standard motors with rated frequency of 60 Hz. When using
a motor with rated frequency (adjusted in P0403) different from 60 Hz, the default value for P0144 may become
inadequate, being able to cause difficulties in the motor starting. A good approximation for the setting of P0144
is given by the formula:
P0144 =
3 x P0142
P0403
If it is necessary to increase the starting torque, increase gradually the value of P0144.
Output
Voltage
Line rated voltage
100 %
P0142
P0143
P0144
0.1Hz
3Hz
P0146
P0145
P0134
P0202=2
Speed/
Frequency
Figure 9.7:
V/f curve in function of P0142 to P0146
Содержание CFW700
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Страница 8: ...Summary...
Страница 34: ...2 General Information 2 4 CFW700...
Страница 38: ...3 About the CFW700 3 4 CFW700...
Страница 56: ...7 Starting up and Settings 7 4 CFW700...
Страница 58: ...8 Available Control Types 8 2 CFW700...
Страница 78: ...10 VVW Control 10 8 CFW700...
Страница 158: ...13 Digital and Analog Inputs and Outputs 13 28 CFW700...
Страница 184: ...16 Read only Parameters 16 12 CFW700...