2 Functions
344
7SD5 Manual
C53000-G1176-C169-1
Figure 2-139 Logic diagram of the frequency protection
2.18.2 Setting Notes
General Frequency protection is only in effect and accessible if address 136 FREQUENCY
Prot. is set to Enabled during configuration of protective functions. If the function is
not required, Disabled is to be set.
The frequency protection function features 4 frequency stages f1 to f4 each of which
can function as overfrequency stage or underfrequency stage. Each zone can be set
active or inactive. This is set in addresses:
• 3601 O/U FREQ. f1 for frequency stage f1,
• 3611 O/U FREQ. f2 for frequency stage f2,
• 3621 O/U FREQ. f3 for frequency stage f3,
• 3631 O/U FREQ. f4 for frequency stage f4,
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