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What is the meaning of Frequency adaptation mode parameter and what is the adapted frequency?

The device has an algorithm to automatically calculate the network frequency, learned frequency is shown in “Adapted frequency field”.

When the “Frequency adaptation mode” is set to “Auto” the frequency will be automatically updated. When the device has measured voltage for approximately 45 seconds the adapted frequency field will update even it has been set previously.
 
In case the adaption mode is set to “manual” you can set the frequency in adapted frequency field which will not be updated even the measured frequency is different but relay will internally use the adapted frequency whenever available.
 
“Fixed” mode means that frequency will not have any update from measured voltage (or current for some models) and the set value only will be used. This mode is recommended to be used especially with line differential function.
 
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