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SURT 6000Kva + Step Down transformer to Transfer Switch - Different voltages? | Smart-UPS & Symmetra LX / RM

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SURT 6000Kva + Step Down transformer to Transfer Switch - Different voltages?

Discussion in Smart-UPS & Symmetra LX / RM started by Lenny , 6 days ago
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SURT 6000Kva + Step Down transformer to Transfer Switch - Different voltages?

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  • lennyburns

    I have a pair of SURT 6Kva UPS units, each with the same model and type od APC step down transformer.
    I use an APC ATS (Auto Transfer Switch) across each transformer to provide redundant power to my 110v devices with a single power cord.

    In the measurement section of the ATS, I see that the input voltages on each side wander around slightly, but always are about 5 volts off from each other.
    Here is what I see:

    Source Measurements
      Source A Source B
    Input Frequency:  60 Hz  60 Hz
    Input Voltage:  124 VAC  121 VAC

    So, I looked in the UPS  status pages on each UPS and I see less than 1v deviation between the output voltages of each.
    Like so...

    UPS-A

    Power
    Input Voltage: 243.3 VAC
    Output Voltage: 209.4 VAC
    Input Frequency: 60.02 Hz

    UPS-B

    Power
    Input Voltage: 244.8 VAC
    Output Voltage: 208.2 VAC
    Input Frequency: 60.02 Hz

    Why would the voltage be so different at the ATS measurements page?
    Can I adjust this or "tune" it via some interface or by making some internal adjustment?

     

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