3-1
SECTION 3
FUNCTIONAL DESCRIPTION
FUNCTIONAL DESCRIPTION
Functional circuit descriptions provided in this section apply to both the 50 hertz and 60 hertz
underfrequency relays. Refer to Figure 3-1 for a typical functional block diagram.
Sensing
When single-phase 120 Vac is applied to the sensing input, the input transformer provides the proper
signal levels to the voltage inhibit and input conditioning circuits.
Figure 3-1. Functional Block Diagram
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