Setting The Frequency - Siemens SIPROTEC 4/5 Handbuch

Commissioning
5.2 Changing the Polarity-Reversal Frequency
Unscrew the 4 screws used to attach the Z-shaped angle brackets to the housing and remove the Z-
²
shaped angle brackets (see
Pull off the 2 covering caps on the front cover upward or downward as appropriate (see
²
Unscrew and remove the screws located in the center at the top and bottom of the front cover.
²
[scabbaufront, 1, en_US]
Figure 5-1
Carefully pull the pluggable printed circuit board assembly from the housing and put it down so that the
²
DIP switch S1 is accessible.
Once you have performed the necessary work on the printed circuit board assembly, reinstall the plug-
²
gable printed circuit board assembly using similar steps in reverse order.
Injection Unit in the Flush-Mounting Housing 7XT7100-0EA00
Switch off the plant providing the auxiliary voltage for the injection unit 7XT71.
²
Switch off all signaling voltages fed to the device.
²
Pull off the 2 covering caps on the front cover upward or downward as appropriate (see
²
Unscrew and remove the screws located in the center at the top and bottom of the front cover (see
²
Figure 5-1).
Carefully pull the pluggable printed circuit board assembly from the housing and put it down so that the
²
DIP switch S1 is accessible.
Once you have performed the necessary work on the printed circuit board assembly, reinstall the plug-
²
gable printed circuit board assembly using similar steps in reverse order.
5.2.3

Setting the Frequency

You can set the polarity-reversal frequency (frequency of the square-wave generator) using the DIP switch S1
on the printed circuit board assembly.
32
Figure 4-2).
Removing the Front Cover
Figure
Figure
SIPROTEC 4/5, Injection unit 7XT71, Manual
C53000-B1174-C128-8, Edition 05.2020
4-1).
4-1).