[Elecraft] KPA1500 power supply (remote)

[jerry]

On 2022-08-14 08:43, Dick Dievendorff wrote:
> The KPA1500 power supply container houses several power supplies. Only
> a small one is on all the time. It can run a microcontroller and
> switch the larger supplies, but not much else.

*** And with good reason.  It's hard to switch say 65Amps at 50V ( I 
don't know
the exact voltage of the PA, but 50 - 53V is common ).  And PA's are 
very sensitive to voltage
drop.  The less, the better.

    I have a very quiet homebrew amp with a remote mounted power supply.  
The supply lives
in a box under the bed.  Right now I duck under the bed to turn it on & 
off.  I have a high power
12V relay on the bench.  I plan to put that relay at the AC line input 
and use a separate 12V power
supply to power it.  A couple of wires to the RF deck going to a little 
tiny toggle switch on
the front panel.  Two other small wires will also go to the power supply 
to talk to it via CAN bus,
which can monitor output current and two power supply temperatures.  I 
*could* extend the CAN bus
to a processor to control the power input relay, but I don't want to 
work that hard :).

              - Jerry, KF6VB



> 
> The 50V and 12v supplies are switched completely off when the amp is
> “off”. The fans are associated with the 50v supply.
> 
> It’s like a TV set that can be operated by a remote control. Or a wall
> power switch that can be turned on by a microcontroller.
> 
> 73 de Dick, K6KR
> 
>> On Aug 14, 2022, at 08:17, Rick Tavan <rick at tavan.com> wrote:
>> 
>> I leave my KPA1500 PS on continuously, whether I'm local or remote. 
>> No
>> observed ill effects. When the amp is off, the PS is silent. I haven't
>> measured its current drain in that condition but I expect it is 
>> minimal. I
>> have a remote relay box that I could use to key a larger relay in the 
>> 230V
>> AC supply line but I don't see any need to do that.
>> 
>> 73,
>> 
>> /Rick N6XI
>> 
>>> On Sun, Aug 14, 2022 at 6:30 AM Jorge Diez - CX6VM 
>>> <cx6vm.jorge at gmail.com>
>>> wrote:
>>> 
>>> Hello!
>>> 
>>> when you use the KPA1500 remotely, the power is always on. With which 
>>> it
>>> could spend several years on continuously. Could this be harmful to
>>> the power supply?
>>> 
>>> Is it thought and designed to withstand this?
>>> 
>>> Is there a way to turn the power on and off remotely?
>>> 
>>> thanks!
>>> 
>>> --
>>> 73,
>>> Jorge
>>> CX6VM/CW5W
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>> 
>> 
>> --
>> --
>> 
>> Rick Tavan
>> Truckee and Saratoga, CA
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