[Amps] Sort Start

[Larry Carman]

The Henry RF generator using a 4 KW power supply at 4000 VDC and a filter
choke
only use a .5 second soft start. The 1/2 second delay seems to be plenty
even
with 30 mf of caps and no filter choke.  I've been running this arrangement
or years. Too much soft start in certain instances will cause the bypass
relays
to energize too slow and cause relay clattering amongst other problems.

Regards,
Larry N5BIP

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]On
Behalf Of Will Matney
Sent: Tuesday, August 09, 2005 11:30 AM
To: amps at contesting.com
Subject: Re: [Amps] Sort Start


You can add a soft start, some do and some don't. A 10 second delay though
is a little too long for the soft start on the HV transformer. You only need
about 4 to 5 seconds as that's actually over the time it takes for the
transformer to settle down. Some circuits are a little faster than that.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 8/9/05 at 11:15 AM Rich wrote:

>Gentleman, I have started bread boarding my power supply.  So far I have
>it set for the filament transformer and fan to come on first, run for 3
>( adjustable ) min then kick in a relay for 0 to280v to the HV trans , I
>have a 50ohm 100 watt resistor in line for 10 sec then full voltage (as
>set by the autotransformer) to the HV transformer.
>The caps bank will be 33uF at 6000vdc ( 3 caps 100mF 2000vdc each ),
>transformer will be set 3000 to 40000vdc.
>Before I bolt it all down and hard wire it do I need a soft start for
>the filament?
>The tube is a 4-1000a
>
>Rich , kd0zz
>
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