MR TRAFOGUARD ISM, Руководство по эксплуатации

Страница: 92 / 224

6 Functions and settings
Maschinenfabrik Reinhausen GmbH 2016 92 5163667/00 EN TRAFOGUARD® ISM®
Behavior only with delay time T1
If the measured voltage U
actual
is within the set bandwidth , no control
commands are issued to the motor-drive unit for the tap-change operation.
Control commands will also not be issued to the motor-drive unit if the meas-
ured voltage returns to the tolerance bandwidth
within the set delay time
T1 . However, if the measured voltage deviates from the set bandwidth for
a long period , a tap-change command occurs after expiration of the
set delay time T1. The on-load tap-changer carries out a tap-change in a
raise or lower direction to return to the tolerance bandwidth.
Figure 78: Behavior of the regulation function with delay time T1
1 + B %: Upper limit 4 Set delay time T1
2 U
desired
: Desired value 5 U
actual
: Measured voltage
3 - B %: Lower limit 6 B%: Tolerance bandwidth
A U
actual
is outside the band-
width. Delay time T1 starts.
B U
actual
is within the bandwidth
before delay time T1 is com-
plete.
C U
actual
is outside the band-
width. Delay time T1 starts.
D U
actual
is still outside the band-
width when delay time T1 is
complete. Tap-change opera-
tion is initiated.
Setting delay time T1
To set the delay time T1, proceed as follows:
1.
Go to Settings > Parameters > Control > Delay time T1 .
2. Enter delay time T1.
3. Press the Accept button to save the modified parameter.