Lenze i550

10.4.3.1 Linear V/f characterisc
The linear V/f characterisc leads to a constant torque.
Details
Select 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)= "Linear [0]"
Seng of the V/f characterisc:
•
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).
0
[V]
[Hz]
0
0x2B01 001:
0x2B01 002:
0x2540 001:
0x29160x2915
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.
Example
Mot power
•
400 V/50 Hz
Sengs
•
Maximum frequency 75 Hz
•
Minimum frequency 10 Hz
Explanaon
•
Graphic on the le: The inverter is operated with a rated mains voltage of 400 V.
•
Graphic on the right: The inverter is operated with a rated mains voltage of 480 V. This
allows the output voltage to further increase above 50 Hz.
0
[V]
[Hz]
0
0
[V]
[Hz]
010 50 75 10 50 75
400 400
480
Parameter Designaon Seng for this example
0x2540:001 (P208.01) Rated mains voltage 400 Ve [1] (on the le) / 480 Ve [2] (on the right)
0x2915 (P210.00) Minimum frequency 10 Hz
0x2916 (P211.00) Maximum frequency 75 Hz
0x2B01:001 (P303.01) Base voltage 400 V
0x2B01:002 (P303.02) Base frequency 50 Hz
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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