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UPS Systems

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    UPS Systems

    25. Undervoltage protection for a UPS should:
    A- Inhibit the ATS
    B- Open the AC input breaker
    C- Start the generator
    D- Open the inverter input breaker

    Does anyone know the answer to this question? I thought they might be referring to DC Undervoltage to open the inverter input breaker (D) since one of the electrical tests for a UPS is: "Test dc undervoltage trip level on inverter input breaker" (NETA-ATS 7.222.2.B.4). According to testguy, that was not the correct answer.

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    Quote Originally Posted by Cantonellis View Post
    25. Undervoltage protection for a UPS should:
    A- Inhibit the ATS
    B- Open the AC input breaker
    C- Start the generator
    D- Open the inverter input breaker

    Does anyone know the answer to this question? I thought they might be referring to DC Undervoltage to open the inverter input breaker (D) since one of the electrical tests for a UPS is: "Test dc undervoltage trip level on inverter input breaker" (NETA-ATS 7.222.2.B.4). According to testguy, that was not the correct answer.
    According to NETA 7.22.2.D.4 upon DC undervoltage, shall trip the inverter input breaker.

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