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    Rapid Cycling During Power Outages

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    SpotcheckBilly

    Posts : 6
    Join date : 2012-03-03

    Rapid Cycling During Power Outages

    Post by SpotcheckBilly on Fri Apr 20, 2012 4:55 pm

    We have occasional power outages in our area mostly due to storm activity that more often than not include a rapid series of on/off cycles before the power fully goes off.

    Since I'm aware that this behavior can really adversely affect tube gear I installed an Intermatic Panel Guard whole house surge protector and an APC G50 power filter that is equipped with a variable delay turn on/shut off feature.

    I'm able to set this delay anywhere between 4 and 255 seconds. My question is - what is a safe delay time to use for my ST120 with KT120's? At this time I've dialed it in at 60 seconds. Is that about right or should I go for more delay time?

    Otherwise, our power provider does pretty well. So far the input voltage runs between 120 and 122 V and I've yet to experience any brown-outs. But the season has just started. affraid

    Cheers,
    SB

    Bob Latino
    Admin

    Posts : 2411
    Join date : 2008-11-26
    Location : Massachusetts

    Re: Rapid Cycling During Power Outages

    Post by Bob Latino on Fri Apr 20, 2012 5:20 pm

    Hi SB,

    On your Panel Guard ... Everyone may have a different opinion but probably 30 seconds minumum for the quad cap to discharge to the point where a restart won't take out the rectifier. Having your Panel Guard set up for 60 seconds IMHO is fine. You probably don't need any more delay than that.

    Bob

    SpotcheckBilly

    Posts : 6
    Join date : 2012-03-03

    Re: Rapid Cycling During Power Outages

    Post by SpotcheckBilly on Fri Apr 20, 2012 5:30 pm

    Bob,

    Thank you for the prompt response. Rather be safe than sorry Very Happy

    Cheers,
    SB

    heyraz

    Posts : 58
    Join date : 2011-10-26

    Re: Rapid Cycling During Power Outages

    Post by heyraz on Fri Apr 20, 2012 6:46 pm

    I thought the purpose of the diode mod was to protect the rectifier tube from a rapid cycle power outage. In the diode mod diagram however, the diodes are between the transformer and the rectifier. Why not between the rectifier and the quad cap?

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