KEB COMBIVERT F5 BASIC Applications Manual page 173

U/f-Characteristic Adjustment
6.5.5 Voltage
Stabilization
(uF.9)
Fig. 6.5.5.a Voltage stabilization
uF.9 = 1...649 V
650 = off (default)
Example: uF.9 = 230V
Fig. 6.5.5.b Example: Acceleration with load
with voltage stabilization
Motord speed
Voltage stabilization
PT1-time constant
(uF.19)
(only for F5-G >= D-housing)
© KEB Antriebstechnik, 2002
All rights reserved
Due to fluctuations of the mains voltage or the load the DC-link voltage and with it the
directly dependent output voltage can change. In the case of enabled voltage
stabilization the fluctuations of the output voltage are compensated. That means 100%
output voltage correspond to the value adjusted in uF.9, but maximally 110 % · (DC-
link voltage / √ 2 ). Furthermore, this function makes it possible to adapt motors with
a smaller rated current to the inverter.
U
250 V
uF.9 = 230V
CP.17=230 V
190 V
no Boost is adjusted
Motor voltage
Load
With uF.19 the time constant of a PT1-element is defined. The PT1-element serves for
the smoothing of the DC-link voltage. The initial value of the PT1-element is used as
actual value for the voltage stabilization.
uF.19 PT1-time constant
0
1
2
3
4
5
6
7
8
9
10
Name: Basis
KEB COMBIVERT F5
Functional Description
/U
N A
U bei U
A
U bei U
A
U bei U
A
U bei U
A
U
N
U
A
CP.16=50 Hz
uF.0 = 50Hz
without voltage stabilization
Motor speed
Motor voltage
Function off
2 ms
4 ms
8 ms
16 ms
32 ms
64 ms
128 ms
256 ms
512 ms
1024 ms
= 250V unstabilized
N
= 250V stabilized
N
= 190V stablized
N
= 190V unstablized
N
= Mains voltage
= Output voltage
f
Load
Date Chapter Section
6 5
17.04.02
6
Page
5