Siemens SIPROTEC 4 7XT71 Mode D'emploi page 29

Frequency of polarity reversal
Fig. 9-3
✧ Adjust the desired frequency at DIP-switches S101.1 to S101.4 according to
Table 9-1 .
✧ Reinstall the device as described in Chapter 9.2.2.
✧ If you have disconnected the cables from the terminal strip, reconnect the
cables to the screw terminals. Observe the correct wiring when doing so.
✧ Take the device into operation.
✧ Check the test value for the Injection Unit 7XT71 at the Multifunctional Machine
Protection 7UM62.
✧ If the test values are correct, the frequency setting is finished.
✧ Note the new frequency on the sticker affixed to the device.
Fig. 9-4
NOTE
If the Multifunctional Machine Protection 7UM62 does not show any correct values
yet, repeat the frequency setting at the Injection Unit 7XT71 until the values ap-
proximate the required operating conditions.
SIPROTEC 4, Injection Unit 7XT71, Product Information
C53000-B1175-C128-1, Edition 01.2014
1.5 Hz (default)
Setting the polarity reversal frequency with DIP switch S101
(examples)
Umpolfrequenz /
Frequency of polarity reversal
Sticker for adjusted frequency
Frequency of polarity reversal
0,5 Hz
1,0 Hz
X
1,5 Hz
2,0 Hz
2,5 Hz
3,0 Hz
3,5 Hz
4,0 Hz
0.5 Hz
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