Lenze I51AE175B User Manual

8.2.1 V/f characterisc control (VFC)
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 suitable for asynchronous motors.
•
If you want to actuate 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 character-
isc!
•
From the motor nameplate data, 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
^ 114
•
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 (P300.00) = " V/f characterisc control
(VFC open loop) [6]".
•
0x2B00 (P302.00) provides dierent characterisc shapes which are described in detail in
the following subchapters.
•
Liming factors for the V/f characterisc are rated mains voltage 0x2540:001 (P208.01),
minimum frequency 0x2915 (P210.00) and maximum frequency 0x2916 (P211.00).
Parameter Name / value range / [default seng] Info
0x2B00
(P302.00)
V/f characterisc shape
(V/f charac.shape)
•
Seng can only be changed if the inverter is inhibi-
ted.
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.
4Linear V/f characterisc ^ 117
1 Quadrac 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 suitable for operaon with a
square-law V/f characterisc, use the linear V/f characterisc instead.
4Square-law V/f characterisc ^ 118
2 Mulpoint (from version 03.00) Linear characteriscs with an addional centre characterisc point for
the purpose of adaptaon to specic load proles.
4User-denable V/f characterisc ^ 119
3 Eco (from version 02.00) Linear characterisc with energy opmisaon in the paral load opera-
onal range.
4V/f characterisc control - energy-saving (VFC Eco) ^ 120
0x2B01:001
(P303.01)
V/f shape data: Base voltage
(V/f shape data: Base voltage)
0 ... [230]* ... 5000 V
* Default seng depending on the size.
Base voltage and base frequency dene the V/f rao and thus the gradi-
ent of the V/f characterisc.
•
The V/f base voltage is usually set to the rated motor voltage
0x2C01:007 (P320.07).
•
The V/f base frequency is usually set to the rated motor frequency
0x2C01:005 (P320.05).
0x2B01:002
(P303.02)
V/f shape data: Base frequency
(V/f shape data: Base frequency)
Device for 50-Hz mains: 0 ... [50]* ... 1500 Hz
Device for 60-Hz mains: 0 ... [60]* ... 1500 Hz
* Default seng depending on the size.
Motor control
Motor control selecon
V/f characterisc control (VFC)
116

Lenze I51AE175B Specifications

General

Brand	Lenze
Model	I51AE175B
Category	Inverter
Language	English