Sinee EM730 Series, User Manual

Page: 187 / 345

User Manual of EM730/EM730E Series Inverter
187
V/F=2*X* (rated voltage of the motor)/(rated frequency of the motor)
Function
code
Function code
name
Parameter description Unit
Default
setting
Attribute
F05.01
Frequency point F1
of multi-point VF
0.00 - F05.03 Hz 0.50
●
F05.02
Voltage point V1 of
multi-point VF 0.0
～
100.0 (100.0 = Rated
voltage)
% 1.0
●
F05.03
Frequency point F2
of multi-point VF
F05.01
～
F05.05 Hz 2.00
●
F05.04
Voltage point V2 of
multi-point VF
0.0-100.0 % 4.0
●
F05.05
Frequency point F3
of multi-point VF F05.03 to rated frequency of
motor (reference frequency)
Hz 5.00
●
F05.06
Voltage point V3 of
multi-point VF
0.0-100.0 % 10.0
●
The code parameters F05.01 to F05.06 are valid when the multi-point polyline VF is
selected (F05.00=1).
All V/F curves are dependent on the curve set by the percentage of input frequency and the
percentage of output voltage, linearized in sections within different input ranges.
The rated frequency of the motor is the final frequency of the V/F curve, and also the
frequency corresponding to the highest output voltage. Percentage of the input frequency: rated
frequency of the motor = 100.0%; percentage of the output voltage: rated voltage U
e
of the
motor = 100.0%.
The relationships of the three voltage points and frequency points must meet the following
requirements: V1<V2<V3, F1<F2<F3;
If the slope of the V/F curve is too large, the “overcurrent” protection may be
enabled. Particularly, if the low-frequency voltage is too high, the motor may be
overheated and even burnt, and the inverter may be subject to overcurrent stall or
overcurrent protection.