Lenze i510 - Motor Control Selection; V;F Characteristic Control

7.2 Motor control selecon
The inverter supports dierent modes for closed-loop/open-loop motor control.
Parameter Name / value range / [default seng] Info
0x2C00
(PAR 300)
Motor contr
ol type
(Motor ctrl mode)
•
Seng can only be changed if controller inhibit is
acve.
Selecon of the motor control type.
4 Sensorless vector control (SLVC) This control type is used for sensorless vector control of an asynchro-
nous motor.
4Sensorless vector control (SLVC) ^ 82
6 V/f characterisc control (VFC open loop) This control mode is used for the speed control of an asynchronous
motor via a V/f characterisc and is the simplest con
trol mode.
4V/f characterisc control ^ 81
In the following subchapters, each motor control is described in detail.
7.2.1 V/f
characterisc c
on
tr
ol
The V
/f characterisc control is a motor control for convenonal frequency inverter applica-
ons. It is based on a simple and robust control mode for the operaon of asynchronous
motors with a linear or square-law load torque characterisc (e.g. fan). Because of the mini-
mal parameterisaon eort, such applicaons can be commissioned easily and quickly.
Precondions
•
The V/f characterisc control is only suit
able for asynchronous motors.
•
If you want to actua
te a drive with a square-law V/f characterisc: please always check
whether the corresponding drive is suitable for operaon with a square-law V/f characteris-
c!
•
From the motor nameplate da
ta, at least the rated speed and rated frequency must be
entered, so that the inverter can calculate the correct number of pole pairs. 4Motor data
^ 78
•
The motor must only be actuated above the rated motor frequency/rated voltage if this is
expressly approved by the motor manufacturer!
Details
This motor control type is acvated by seng 0x2C00 (PAR 300) = " V/f characterisc con
trol
(VFC open loop) [6]".
Parameter Name / value range / [default seng] Info
0x2B00
(PAR 302)
V/f characterisc shape
(V/f curve)
•
Seng c
an only be changed if controller inhibit is
acve.
Selecon of the V/f characterisc shape for the adaptaon to dierent
load proles.
0 Linear Linear characterisc for drives with constant load torque over the speed.
1 Square-law Square-law characterisc for drives with a linear or square-law load tor-
que over the speed.
•
Square-law V/f characteriscs are preferably used for centrifugal
pumps and fan drives.
•
Please always check whether the corresponding drive is suitable for
operaon with a square-law V/f characterisc!
•
If your pump drive or fan drive is not suit
able for operaon with a
square-law V/f characterisc, use the linear V/f characterisc ins
tead.
0x2B01:001
(PAR 303/001)
V/f characterisc data: Base voltage
(V/f char. data: Base voltage)
0 ... [230]* ... 5000 V
•
Default seng depending on the size.
Voltage in the reference point of the V/f characterisc.
•
The V/f base voltage is usually se
t to the rated motor voltage
0x2C01:007 (PAR 320/007).
0x2B01:002
(PAR 303/002)
V/f characterisc data
: Base frequency
(V/f char. data: Base frequency)
0 ... [50]* ... 599 Hz
•
Default seng depending on the size.
Frequency in the reference point of the V/f characterisc.
•
The V/f base frequency is usually set to the r
ated motor frequency
0x2C01:005 (PAR 320/005).
Motor control
Motor control selecon
V
/f characterisc control
81
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