Siemens SIPROTEC 4/5 Handbuch Seite 96

Commissioning
5.2 Changing the Polarity-Reversal Frequency
Check the test values for the injection unit 7XT71 on the 7UM62/7UM85.
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If the test values are correct, setting the frequency is completed.
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Note the new frequency on the label on the device.
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Figure 5-4
NOTE
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If the 7UM62/7UM85 does not display correct values, repeat the frequency setting on the injection unit
7XT71 until the values roughly correspond to the required operating conditions.
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Label for the Set Frequency
SIPROTEC 4/5, Injection unit 7XT71, Manual
C53000-B1174-C128-8, Edition 05.2020