9 Visualization
Maschinenfabrik Reinhausen GmbH 2020
190
6385142/08 EN
ETOS
®
ED
Bandwidth
You can use this parameter to set the maximum permissible deviation of the
measured voltage U
actual
from the desired value U
desired
.
In order to set the correct value, the transformer step voltage and nominal
voltage must be known. Note that a large bandwidth will result in a large
control deviation.
The bandwidth must always be greater than the following value:
|
±
B
|
≥ 0,6×
U
n
- 1
-
U
n
U
N
× 100
%
U
n-1
Step voltage of tap position n-1
U
n
Step voltage of tap position n
U
N
Nominal voltage
The following transformer values are used to determine the minimum band-
width:
Nominal voltage U
N
= 11000 V
Step voltage in tap position 4 U
Step4
= 11275 V
Step voltage in tap position 5 U
Step5
= 11000 V
Delay time T1
Delay time T1 delays the issuing of a tap-change command for a defined pe-
riod. This prevents unnecessary tap-change operations if the tolerance
bandwidth is exited briefly.
Response to delay time T1
If the control variable
is within the set bandwidth
, no control com-
mands are issued to the motor drive unit for the tap change. Control com-
mands will also not be issued to the motor-drive unit if the control variable
returns to the bandwidth
within the set delay time T1
. However, if the
control variable deviates from the set bandwidth for a long period
, a tap-
