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Vmin significant drop, Bypass not in range; high voltage | Smart-UPS & Symmetra LX / RM

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Vmin significant drop, Bypass not in range; high voltage

Discussion in Smart-UPS & Symmetra LX / RM started by Eduard , 2/17/2019 7:01 PM
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Posted in: General

Vmin significant drop, Bypass not in range; high voltage

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  • edemura

    HI 

    I have Smart-UPS SRT 5000 and it reported Bypass not in range; 


    In the data log i can see that Vmin significantly dropped at 02/02/2019 18:57:44. What could cause Vmin to drop like this ?Could this be a reason for bypass?  It is still ongoing issue, last time occurred on 02/14

    Thank you

    1 Critical Alarm Present
     - Bypass not in range ; either frequency or voltage.
    UPS Input
    Input Voltage: 247.2  VAC @  60.0  Hz
    UPS Output
    Output Voltage: 207.8  VAC @  59.9  Hz
    Output VA: 9.7 %
    Output Efficiency: load too low
    Load Current: 2.5  Amps
    Output Watts: 9.7 %
    Output Energy Usage: 1170.67 kWh
    Data Log 
      Smart-UPS SRT 5000
    Date Time                    Vmin    Vmax    Vout   Iout %Wout %out FrqOut %Cap Vbat Tups 
     02/02/2019 20:37:59 243.13 247.16 207.81 2.44 9.44 9.51 60.00 100.00 217.03 +21.00 
     02/02/2019 20:27:59 246.20 247.22 207.81 2.44 9.67 9.61 59.95 100.00 217.22 +21.00 
     02/02/2019 20:17:59 246.27 247.06 207.80 2.50 9.61 9.66 59.95 100.00 217.13 +21.00 
     02/02/2019 20:07:59 246.28 247.05 207.83 2.41 9.42 9.31 59.94 100.00 217.22 +21.00 
     02/02/2019 19:57:59 246.23 247.06 207.84 2.47 9.46 9.28 60.00 100.00 217.25 +21.00 
     02/02/2019 19:47:59 241.55 247.02 207.81 2.50 9.66 9.64 60.00 100.00 217.25 +21.00 
     02/02/2019 19:37:59 246.00 246.72 207.80 2.53 9.55 9.64 60.00 100.00 217.38 +21.00 
     02/02/2019 19:27:44 246.05 246.72 207.80 2.44 9.38 9.37 60.00 100.00 217.72 +21.00 
     02/02/2019 19:17:44 245.73 246.77 207.81 2.50 9.44 9.70 60.00 100.00 217.75 +21.00 
     02/02/2019 19:07:44 222.42 246.91 207.78 2.50 9.56 9.65 60.00 100.00 217.69 +21.00 
     02/02/2019 18:57:44 166.64 246.91 207.80 2.44 9.64 9.54 60.00 100.00 217.72 +21.00 
     02/02/2019 18:47:44 244.59 245.41 207.78 2.50 9.52 9.51 59.94 100.00 217.72 +21.00 
    02/02/2019 10:37:41 245.63 246.55 207.80 2.50 9.44 9.65 60.00 100.00 217.81 +21.00 
     02/02/2019 10:27:41 245.56 246.55 207.83 2.50 9.61 9.58 59.95 100.00 217.09 +21.00 
     02/02/2019 10:17:41 245.17 246.36 207.83 2.47 9.43 9.56 60.00 100.00 216.47 +21.00 
    Attachments
  • liamg

    Hi Eduard - 

    Yes, these voltage drops would be the cause of your "Bypass not in range" alerts. This is in reference to the input power to the UPS, so you might have to speak to an electrician or your Utility company to know the exact cause of the sags. You can adjust the acceptable bypass range via the network management card. Go to the Configuration menu and then select "Power Options". 

  • edemura

    HI Liam

    Thank you for a quick reply. I appreciate your time.

    I will go ahead and change lower bypass voltage and talk to an electrician.

    Do you think input voltage and output voltage settings are not a problem in this case? I wanted to change rated output, but only value there  is 208/240 and Output upper limit is only 235, not sure if this might cause any problems.

    UPS Input
    Input Voltage: 247.2  VAC @  60.0  Hz
    UPS Output
    Output Voltage: 207.8  VAC @  59.9  Hz
    Output VA: 9.7 %
    Output Efficiency: load too low

    Again thank you for your help.
  • liamg

    Yes, you will definitely get improved performance by setting the output to match the nominal input. In this case that would be 240v. You have to turn off the UPS output in order to make this change.

  • edemura
    This discussion is marked as answered

    Thank you Liam. 

    I think at this point my problem has been solved. 

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