SS-30DV dc-power supply problem

[VECTOR]

When I turn on this supply (SS-30DV) the fan turns on briefly then off.
I assumed this was normal and it would turn on if the temp. increases
etc. However the supply would turn off after a variable period of  time
(~20 min) and then after about 10 min I was able to turn it on again!!
Since the fan was not turning on I thought the supply was over heating
and the over-temp. protection cct. would trip before the fan would come
on. This is not the way it should work of course. The temp. sensing cct.
should turn the fan on long before the over-temp cct. Oddly, at times, I
could run for 3-4 hrs and it would not trip! My station is a Kenwood
710GA, 50w dual band, I use VHF 90% of the time. Has anyone experienced
this problem with this supply? I'm a retired elec/tech, if I could get a
schematic I could trouble shoot it, the fan or fan cct is not working
properly, this may have been the problem from the getgo hard to tell as
it worked fine for about 8 mo.

73 Richard

VE7PNP

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[Drew AF2Z]

I have an SS-30DV. I don't know if this helps you, but...

In this weather, shack temp typically 80F and more, the fan is audible
all the time, even under very light load. I'm not sure what temperature
it turns on.

In winter, shack temp 50F, the fan is off. I don't recall hearing it run
at all, even when I've been operating the K3/100 CW for a while; maybe
it runs at a lower speed that I don't hear. (I'm kind of sensitive to
fan noise; replaced the original K3 fans because they sometimes kicked
in with a very faint rattling sound.)

Anyhow, if I were you I'd turn a hair dryer on the thing and see if the
fans go on at all.

73,
Drew
AF2Z



On 07/18/20 20:14, R.Shanks wrote:

> When I turn on this supply (SS-30DV) the fan turns on briefly then off.
> I assumed this was normal and it would turn on if the temp. increases
> etc. However the supply would turn off after a variable period of  time
> (~20 min) and then after about 10 min I was able to turn it on again!!
> Since the fan was not turning on I thought the supply was over heating
> and the over-temp. protection cct. would trip before the fan would come
> on. This is not the way it should work of course. The temp. sensing cct.
> should turn the fan on long before the over-temp cct. Oddly, at times, I
> could run for 3-4 hrs and it would not trip! My station is a Kenwood
> 710GA, 50w dual band, I use VHF 90% of the time. Has anyone experienced
> this problem with this supply? I'm a retired elec/tech, if I could get a
> schematic I could trouble shoot it, the fan or fan cct is not working
> properly, this may have been the problem from the getgo hard to tell as
> it worked fine for about 8 mo.
>
> 73 Richard
>
> VE7PNP
>
> ______________________________________________________________
> 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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