8400 StateLine C | Reference manual
Motor control (MCTRL)
V/f characteristic control - energy-saving (VFCplusEco)
144 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
5.5 V/f characteristic control - energy-saving (VFCplusEco)
This function extension is available from version 10.00.00!
With the energy-saving V/f characteristic control mode (VFCplusEco), the motor voltage of
the inverter is detected by means of a linear characteristic depending on the field
frequency to be created or the motor speed. Moreover, a cosϕ control and the resulting
voltage reduction causes the motor to be always operated in the optimum efficiency range
(reduction of copper losses in the asynchronous motor).
Hence, these are the advantages of this motor control mode:
– Good robustness
– Easy parameter setting
– High energy efficiency (lower heating of the motor in partial load operational range)
– Same speed accuracy and maximum torques as with VFCplus
Predestinated application areas of this motor control mode are materials handling
technology and pump and fan systems.
This motor control mode serves to improve efficiency of standard asynchronous motors
with efficiency class IE1 (standard IEC 60034-30 2008) in the range 0 … M
efficiency_max
between 0 … 20 % (Ø 5 … 10 %).
– For asynchronous motors with energy efficiency class IE2 the potential for efficiency
improvement is reduced to approx. 0 ... 15 %.
– Description of M
efficiency_max
: Indicates the torque [%] of M
rated_motor
, where the
motor has the max. efficiency.)
In case of asynchronous motors with a higher energy efficiency class (IE2 and IE3), the
absolute energy saving of the motor control mode is lower due to improved efficiency
of the machine. However, energy saving is still achieved in a higher load range.
M
efficiency_max
is performance-related and listed in the following table for some power
values of the energy efficiency class IE1 and IE2:
M
Efficiency_max
(related to M
rated_motor
)
Power IE1 IE2
0.25 kW 75 %
0.75 kW 65 % 75 %
2.2 kW 55 % 85 %
7.5 kW 30 % 45 %
22 kW 23 %
45 kW 21 %
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