Lenze i700 - Manual (Page 137)

Lenze · i700 servo inverter · Reference manual · DMS 1.5 EN · 03/2014 · TD05
137
5 Motor control & motor settings
5.14 Parameterising the V/f characteristic control
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Parameterisable functions
Optionally the following functions can be activated for the V/f characteristic control:
• "DC-injection braking" function
• "Flying restart" function
In the Lenze setting these two functions are deactivated.
5.14.1 Defining the V/f characteristic shape
For purposes of adaption to different load profiles, the shape of the characteristic can be selected:
0x2B00 | 0x3300 - VFC: V/f characteristic - shape
[5-9] Principle of a linear V/f characteristic (on the left) and a quadratic V/f characteristic (on the right)
Selection list
(Lenze setting printed in bold)
Info
0 Linear (standard) Linear characteristic for drives with constant load torque
over the speed.
1 Square-law (pumps and fans) Square-law characteristic for drives with a linear or
square-law load torque over the speed.
• Square-law V/f characteristics are preferably used for
centrifugal pumps and fan drives.
• Please always check whether the corresponding drive
is suitable for operation with a quadratic V/f
characteristic!
• If your pump drive or fan drive is not suitable for
operation with a square-law V/f characteristic, use
the linear V/f characteristic instead, or select the
servo control.
2 User-defined User-definable V/f characteristic for drives requiring an
adaptation of the magnetising current via the output
speed.
• The user-definable V/f characteristic can for instance
be used for operation on special machines like the
reluctance motor, for the suppression of oscillations
on the machine, or for energy optimisation.
 Write access  CINH  OSC  P  RX  TX UNSIGNED_8
0
0
0
0
f
set
V V
f
set
Frequency at ref. point
0x2B01:2 | 0x3301:2
Voltage at ref. point
0xB01:1 | 0x3301:1 Voltage at ref. point
0x2B01:1 | 0x3301:1
Frequency at ref. point
0x2B01:2 | 0x3301:2