KPA 500 Fan Not Running
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KPA 500 Fan Not Running
 
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Having a KPA 500 fan problem I believe. Was running the amp during RTTY contest and experienced - a Hi Temp hard fault. The case was very warm to the touch and the fan was not running. KPA Menu - Fan Ctl - is set to normal. So I let it cool down and then ran a test calling CQ a normal run rate (Amp putting out abt 200W) and watched temp climb and the fan does did not come on. When I shut the KPA off, the fan does not run. Does anyone know at what thresholds fan should start running ? Is there some way to do a fan test?73 Paulkc2nyu
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Hi Paul,
My fan turns on at 50 decrees C. If the fan doesn't turn on when you turn off the amp it sounds like there is something wrong with the fan. This function is not related to internal temperature. 73, Mike K2MK
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Re: KPA 500 Fan Not Running
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In reply to this post by Elecraft mailing list
I would try to manually spin the fan by hand to check if it has become bound up
Next I'd check to ensure the fan is firmly plugged in From: paul ecker via Elecraft <[hidden email]> To: "[hidden email]" <[hidden email]> Sent: Saturday, May 16, 2015 2:31 PM Subject: [Elecraft] KPA 500 Fan Not Running Having a KPA 500 fan problem I believe. Was running the amp during RTTY contest and experienced - a Hi Temp hard fault. The case was very warm to the touch and the fan was not running. KPA Menu - Fan Ctl - is set to normal. So I let it cool down and then ran a test calling CQ a normal run rate (Amp putting out abt 200W) and watched temp climb and the fan does did not come on. When I shut the KPA off, the fan does not run. Does anyone know at what thresholds fan should start running ? Is there some way to do a fan test?73 Paulkc2nyu ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Elecraft mailing list
Check for two things -1) nothing is jamming the fan so that it won’t turn, and 2) the fan is plugged into the power supply properly as described in the assembly manual.
When the KPA is powered off using the front panel switch, we discharge the power supply capacitors through the fans, which is why the fans will start up at that time. If this is not happening, then the fan is not receiving power. Check these two things and let me know what you find. - Jack Brindle, W6FB Elecraft Engineering > On May 16, 2015, at 11:31 AM, paul ecker via Elecraft <[hidden email]> wrote: > > Having a KPA 500 fan problem I believe. Was running the amp during RTTY contest and experienced - a Hi Temp hard fault. The case was very warm to the touch and the fan was not running. KPA Menu - Fan Ctl - is set to normal. So I let it cool down and then ran a test calling CQ a normal run rate (Amp putting out abt 200W) and watched temp climb and the fan does did not come on. When I shut the KPA off, the fan does not run. Does anyone know at what thresholds fan should start running ? Is there some way to do a fan test?73 Paulkc2nyu > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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