48049-137-05EN

Minimum (Under) and Maximum (Over) Frequency Protection

Provides pickup and dropout values for frequency.

  • Pickup value (A) is set to activate an alarm or trip.

  • Pickup time delay (B) is set to start timing once the pickup value has been passed.

  • Dropout value (C) is set to deactivate the alarm and/or contact.

  • Dropout time delay (D) is set to start timing once the dropout value has been passed.

  • Fmin has a dropout value ≥ pickup value.

  • Fmax has a dropout value ≤ pickup value.

  • When system frequency is set to 400 Hz, the frequency protection is disabled.

Minimum/Maximum Frequency Curves

Minimum Protection Maximum Protection
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