Re: {Collins} [Bulk] Re: [Bulk] Re: 30L-1 - convert between 115V and 230V



Hmmmmm..  Well, and then there is the fact that there is no free lunch.
Efficiency is efficiency and loss is loss. The actual loss in a transformer
is closely related to the current squared times the winding resistance of
the transformer.

Put the two windings in the primary in series for 240 and the winding
resistances sum up and you have half the current of a 115 V install on the
line cord but squared times twice the resistance in the windings.

Now parallel the windings for 115 Vac operation and the line current doubles
but then it is split into two halves by the parallel winding and you have
the very same current in each winding. 

Same winding current(s), thus same transformer loss for either the 240 V or
the 120 V install..  The only place it might make a difference is in the
loss in the line cord itself and that better be pretty minor or you have
chosen the wrong size wire to start with.

Bill 

-----Original Message-----
From: Collins [mailto:collins-bounces+wcarns=austin.rr.com@xxxxxxxxxxxxx] On
Behalf Of Stanley M Miln
Sent: Saturday, November 08, 2014 1:54 PM
To: Dave; 'David Harmon'; 'Rick Poole WA1RKT'; 'collins'
Subject: Re: {Collins} [Bulk] Re: [Bulk] Re: 30L-1 - convert between 115V
and 230V

  Current draw is what heats up the Transformer and  the power supply not
the Voltage. There is half the  current going down the power cord on 240
Volts.
              Stan K6RMR

> Watts are watts no difference in  heat dissipated in power supply 
> transformer.  Primary windings are in either series or parallel in the 
> same transformer.  The iron doesn't know the difference.
>
> -----Original Message-----
> From: Stanley M Miln [mailto:k6rmr@xxxxxxxxxxx]
> Sent: Friday, November 07, 2014 7:44 PM
> To: Dave; 'David Harmon'; 'Rick Poole WA1RKT'; 'collins'
> Subject: [Bulk] Re: {Collins} [Bulk] Re: 30L-1 - convert between 115V 
> and 230V
>
>  Hi Dave
> One good thing about running the 30L1 on 240Volts  is you only pull 
> about
> 4
> amps on the AC in instead  of 8 Amps. That would generate less heat  
> in the Power Supply.
>                    Stan K6RMR
>
>> It is my understanding that stock 30L1 amps came from the factory 
>> wired for
>> 120 volts.  (or maybe a little lower back then).  I have had them 
>> wired both ways and have had identical performance.  Rewiring the 
>> terminal strip[ is touchy since it gets fragile with age.  Also, some 
>> of the AC distributing experts out there have issues with the Collins
>> 240 volt setup which I don't totally understand,  something about 
>> line balance. When I had the shack wired for 240 I added a 120v 20 
>> amp line direct to the panel.  That is where my current 30L1 lives
happily.
>> Dave
>> W7VM
>> -----Original Message-----
>> From: Collins
>> [mailto:collins-bounces+d.gow=frontier.com@xxxxxxxxxxxxx] On Behalf 
>> Of David Harmon
>> Sent: Friday, November 07, 2014 3:33 PM
>> To: 'Rick Poole WA1RKT'; 'collins'
>> Subject: [Bulk] Re: {Collins} 30L-1 - convert between 115V and 230V
>> Importance: High
>>
>> Rick....there is a service bulletin pertaining to ensuring that the 
>> fuse holders are wired correctly....see the CCA website.
>> Also....with the unit upside down looking toward the front....the 
>> terminal strip counts R/L...opposite to what you might think.
>> Follow the rig manual to make the changes on the TS.
>>
>>
>> 73
>>
>> David Harmon
>> K6XYZ
>> Sperry, OK
>>
>> -----Original Message-----
>> From: Collins
>> [mailto:collins-bounces+k6xyz=sbcglobal.net@xxxxxxxxxxxxx]
>> On
>> Behalf Of Rick Poole WA1RKT
>> Sent: Friday, November 7, 2014 5:26 PM
>> To: collins
>> Subject: {Collins} 30L-1 - convert between 115V and 230V
>>
>> I have three 30L-1 amps, two wired for 115V and one wired for 230V.  
>> I can discern absolutely no difference in the performance, and it'll 
>> be more convenient if all three are wired for 115V, so I'm converting 
>> the
>> 230 back to 115.
>>
>> I have this vague recollection that there was more to the conversion 
>> to
>> 230
>> than just changing the jumpers on the power strip.  Someone on one of 
>> these reflectors had come up with a recommendation to do X in order 
>> to prevent some bad thing from happening.  But, I can't find, or 
>> remember, the details.
>>
>> Ring any bells with anyone?
>>
>> Rick WA1RKT
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