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Query on online UPS supply

Discussion in 'Power Electronics' started by yeshu137, Nov 30, 2018.

  1. yeshu137

    yeshu137

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    Nov 30, 2018
    Dear All,
    Please help me to figure out that i am having a equipment of 400VA specification.
    i am driving it by 1KVA online UPS although it is not working.
    i checked power supply inputs are 100-240V~7-3A 50-60Hz.

    Kindly help.
    Thanks,
    Ankit
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    8,686
    1,691
    Nov 17, 2011
    These specs are more like 700 VA (100 V * 7 A or 240 V * 3 A).
    Does the equipment work when connected directly to mains without the UPS?
     
  3. yeshu137

    yeshu137

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    0
    Nov 30, 2018
    Yes it is working fine with mains.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    8,686
    1,691
    Nov 17, 2011
    Does other equipment work on this UPS? If not, the problem seems to be the UPS.
     
  5. yeshu137

    yeshu137

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    0
    Nov 30, 2018
    Other equipment are working fine. Only this equipment is a special case. I want to know the reason behind it.
     
  6. kellys_eye

    kellys_eye

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    Jun 25, 2010
    WHAT equipment? How is it different from 'other equipment'?
     
  7. 73's de Edd

    73's de Edd

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    818
    Aug 21, 2015
    Any chance that the LOAD to the UPS supply is being an inductive motor load?
    IN WHICH CASE . . . . . if you use AC line powering WITHOUT any MONITORING . . . you might actually be using 5X or more power upon initial power up and then tapering down after coming up to speed.
    You would then not even detect it with AC line power . . . pending possibly there being a light on the same line and its resultant slight / short time dimming clue.
    Meanwhile the use of the UPS, results in a " I CAN"T handle this" on powerup, and no spin up action.
     
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