V/F Characteristic Control - Energy-Saving (Vfc Eco) - Lenze i55AE125B Manual

Motor control
Motor control selection
V/f characteristic control (VFC)
8.2.1.4

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 fre-
quency 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)
2. V/f characteristic shape
Setting of the V/f characteristic:
Limiting factors for the V/f characteristic are rated mains voltage
•
minimum frequency 0x2915 (P210.00)
The base voltage 0x2B01:001 (P303.01)
•
nameplate data). The base voltage is preset to the rated mains voltage. This again is preset
according to the product key of the inverter.
The base frequency 0x2B01:002 (P303.02)
•
(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)
The minimum voltage 0x2B0D:001 (P330.01)
•
base voltage 0x2B01:001
The current output frequency can exceed the set maximum frequency if the
gain for the slip compensation in
than 0.
Parameter Name / value range / [default setting]
0x2B0D:001 VFC-ECO: Minimum voltage
(P330.01) (VFC-ECO: Min. voltage)
20 ... [20] ... 100 %
• From version 02.00
0x2B0D:006 Cos phi actual value
(P330.06) (Cos Phi actual)
• Read only
• From version 02.00
0x2822:004 Axis commands: Identify motor data (energized)
(P327.04) (Axis commands: Identify mot.)
0 ... [0] ... 1
0x2822:005 Axis commands: Calibrate motor data (non-energized)
(P327.05) (Axis commands: Calibrate mot.)
0 ... [0] ... 1
170
= "V/f characteristic control (VFC open loop) [6]"
0x2B00 (P302.00)= "Eco [3]"
and maximum frequency
is usually set to the rated motor voltage (motor
4Mains voltage
is usually set to the rated motor frequency
and the base frequency
has to be set in percent with reference to the
(P303.01).
[V]
0x2540 001 :
0x2B01 001 :
0x2B0D 001 :
0
0
0x2915
0x2B09:001 (P315.01)
0x2540:001 (P208.01),
0x2916 (P211.00).
^ 144
0x2B01:002 (P303.02).
100 %
20 %
0x2B01 002 :
[Hz]
0x2916
is set to a value higher
Info
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)
1 = start automatic identification of the motor data.
• Inverter characteristics, motor equivalent circuit diagram data and
controller settings are identified and set automatically.
• During the procedure, the motor is energised!
1 = start automatic calibration of the motor data.
• A default inverter characteristic is loaded.
• the motor equivalent circuit diagram data and controller settings are
calculated on the basis of the currently set rated motor data.
• The motor is not energised.