Announcement

Collapse
No announcement yet.

Fenton BS-1700 UPS - bad AC input relay X-cap

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Fenton BS-1700 UPS - bad AC input relay X-cap

    On a Fenton BS-1700 UPS, it has the problem of not always starting up (often, with a relay chattering) when AC is applied to the mains input.
    So I tried checking the X-class series capacitor (which acts as a reactive component for current limiting for the AC input relay which closes when AC is applied to the mains input - it is not controlled by any other circuitry) and upon measuring, it was less than half of its rated 0.33uF capacity, and replacing this component fixed this problem.

    The X-class capacitor at fault was a Carli unit - I've seen X-class capacitors lose significant capacitance in some cases over time during use.

    A good tip from me is to check any X-class capacitors which are being used as current limiting capacitors as I mentioned earlier.
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
Working...
X