Lenze i550

10.4.3.4 Energy-saving V/f characterisc (VFC-Eco)
In the case of the energy-saving V/f characterisc control (VFCEco), the motor voltage of the
inverter is ascertained based on a linear characterisc as a funcon of the rotary eld fre-
quency or the motor speed to be generated. In addion, the motor is always operated in the
opmum eciency range by means of a cosϕ control and the resulng voltage dip (reducon
of copper losses in the asynchronous motor). This is useful for energy eciency with applica-
ons such as conveyors, where the torque and energy requirements are high during accelera-
on, but lower as soon as the load reaches the staonary speed.
Details
Select energy-saving V/f characterisc control with linear characterisc:
1.
Motor control mode 0x2C00 (P300.00) = "V/f characterisc control (VFC open loop) [6]"
2.
V/f characterisc shape 0x2B00 (P302.00)= "Eco [3]"
Seng of the V/f characterisc:
•
The liming factors for the V/f characterisc are the rated mains voltage 0x2540:001
(P208.01), the minimum frequency 0x2915 (P210.00) and the maximum frequency
0x2916 (P211.00).
•
The base voltage 0x2B01:001 (P303.01) is usually set to the rated motor voltage (motor
nameplate data). The base voltage is preset to the rated mains voltage. This in turn is pre-
set according to the product key of the inverter. 4Mains voltage ^ 39
•
The base frequency 0x2B01:002 (P303.02) is usually set to the rated motor frequency
(motor nameplate data).
Eco eciency range:
•
The Eco eciency range (grey) is between the V/f-standard characterisc (black) and the
V/f Eco characterisc (green).
•
The V/f Eco characterisc (green) is dened by the operang point that results from the
minimum voltage 0x2B0D:001 (P330.01) and the base frequency 0x2B01:002 (P303.02).
•
The minimum voltage 0x2B0D:001 (P330.01) has to be set in percent with reference to the
base voltage 0x2B01:001 (P303.01).
0
[V]
[Hz]
0
20 %
100 %
0x2B01 001:
0x2B01 002:
0x2540 001:
0x29160x2915
0x2B0D 001:
The current output frequency can exceed the set maximum frequency if the
gain for the slip compensaon in 0x2B09:001 (P315.01) is set to a value higher
than 0.
Parameter
Address Name / seng range / [default seng] Info
0x2B0D:001
(P330.01)
VFC-ECO: Minimum voltage
(VFC-ECO: Min. voltage)
20 ... [20] ... 100 %
•
From version 02.00
Dening the operang point of the V/f eco characterisc. The V/f eco
characterisc denes the lower limit of the eco eciency range.
•
100 % ≡ Base voltage 0x2B01:001 (P303.01)
0x2B0D:006
(P330.06)
Cos phi actual value
(Cos Phi actual)
•
Read only
•
From version 02.00
Conguring the motor control
V/f characterisc control for asynchronous motor (VFC open loop)
Dene V/f characterisc shape
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