Emotron VS10 - V;F Characteristic Control Energy-Saving (VFC Eco)

7.2.1.4. V/f characteristic control energy-saving (VFC Eco)
In case of the energy-saving V/f characteristic control (VFCplusEco). the motor voltage of
the inverter is detected by means of a linear characteristic as a function of the rotating
field frequency or motor speed to be generated. Moreover, the motor is always driven in
the optimal efficiency range via a cosϕ control and the resulting voltage reduction
(reduced copper losses in the asynchronous motor).
Details
Select energy-saving V/f characteristic control with linear characteristic:
1. Motor control mode 0x2C00 (P300.00) = "V/f characteristic control (VFC open loop) [6]"
2. V/f characteristic shape 0x2B00 (P302.00) = "Eco [3]"
Setting of the V/f characteristic:
• Limiting factors for the V/f characteristic are rated mains voltage 0x2540:001 (P208.01),
minimum frequency 0x2915 (P210.00) and 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 again is
preset according to the product key of the inverter. Mains voltage
 90
• The base frequency 0x2B01:002 (P303.02) is usually set to the rated motor frequency
(motor nameplate data).
Eco efficiency range:
• The Eco efficiency range (grey) is between the V/f-standard characteristic (black) and
the V/f Eco characteristic (green).
• The V/f Eco characteristic (green) is defined by the operating 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).
The current output frequency can exceed the set maximum frequency if the gain for
the slip compensation in 0x2B09:001 (P315.01) is set to a value higher than 0.
Parameter
Name / value range / [default setting]
Info
0x2B0D:001
(P330.01)
VFC-ECO: Minimum voltage
(VFC-ECO: Min. voltage)
20 ... [20] ... 100 %
• From version 02.00
Defining the operating point of the V/f eco characteristic. The V/f eco
characteristic defines the lower limit of the eco efficiency range.
•
100 % ≡ Base voltage 0x2B01:001 (P303.01)
Next steps
• The inverter provides different functions by means of which the drive behaviour can
be further optimised
.  Optimisation of motor control  122
• A optimisation of the control loops is not mandatory for this motor control type but
may lead to a better control mode.
 Optimisation of the control loops  133