[Milsurplus] Dynamotor inrush

[Paul Thekan]

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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