[Milsurplus] Dynamotor inrush

[Mark K3MSB]

I replied to Paul earlier

"And I would get one if i could find one!"

Within driving distance...

Mark K3MSB

On Thu, Aug 22, 2024, 2:29 PM Tom <noflood1 at sonic.net> wrote:

>   Also using a PP-1104, affectionately known a "Ampszilla", to spin a
> DY-17 dynamotor for an ART-13. I originally ran it on a dedicated 30 amp
> 120 volt circuit and then restrapped for a 15 amp 240 circuit, it ran much
> better.
>
>
>                                                     W6TOM
>
>
>
> On 2024-08-22 10:03, Paul Thekan wrote:
>
> I use a PP-1104 C/G power supply.
> 28v@ 50A or 12 v @ 100. I believe the supply was originally intended to
> be used for charging fork lift batteries.
> It is a great suppy and had never bogged down...except once 30 yrs ago
> when I was going to  turn on a T-195 xmtr I'd just  got.
> I turned on the xmtr ..and immediately a big groan came the power
> supply..the lights in the garage dimmed..and the 40 amp fuse on the Xmtr
> blew.
> The xmtr was stored somewhere damp with the air flow cover open and I
> guess the moisture formed a film on the comutators that formed a short. Got
> them cleaned up ..no damage and the T_195 was fully operational and on the
> air.
> Use the supply on ART 13s, BC 375s, BC 191s as well others..
>
> Paul
> N6FEG
>
> On Thu, Aug 22, 2024, 9:40 AM Mark K3MSB <mark.k3msb at gmail.com> wrote:
>
>> That's why it's on a floor mover from Harbor Freight!     Easy to roll.
>>
>> Mark K3MSB
>>
>> On Thu, Aug 22, 2024, 11:34 AM Jim Whartenby via Milsurplus <
>> milsurplus at mailman.qth.net> wrote:
>>
>>> Moving it must put a strain on your back!  <grin>
>>> Jim
>>>
>>> Logic: Method used to arrive at the wrong conclusion, with confidence.
>>> Murphy
>>>
>>>
>>> On Thursday, August 22, 2024 at 08:33:16 AM CDT, Mark K3MSB <
>>> mark.k3msb at gmail.com> wrote:
>>>
>>>
>>> That's what I do for my SCR-274N setup.    A pair of tractor batteries
>>> in series across the 28V PS Output,   I don't have any problems.
>>>
>>> [image: image.png]
>>>
>>>
>>> On Thu, Aug 22, 2024 at 8:58 AM CL in NC via Milsurplus <
>>> milsurplus at mailman.qth.net> wrote:
>>>
>>> I think most folks just run a pair of car batteries in series for those
>>> big loads with a charger in place to keep things up to snuff, but with the
>>> price of batteries today, a big enough switcher supply is more affordable.
>>> A 24 volt supply is usually cheaper than a 28, sometimes by a lot, and you
>>> can adjust them up to about 26.5, no real reason to run 28 as there was
>>> only 28 when the aircraft engines were running, 24 when not.  Meanwell
>>> supply's are very radio quiet.
>>>
>>> Charlie, W4MEC in NC
>>>
>>>
>>>
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