[Boatanchors] Dynamotor Power Supply.

[D C _Mac_ Macdonald]

I have one of those I bought several years ago on eBay but have not yet used.  What is the load sharing connection that is required to double the two outputs up?

73 de Mac, K2GKK/5​
(Since 30 Nov '53)​
Oklahoma City, OK​
USAF Retired 61-81​
FAA Retired 94-10

________________________________
From: boatanchors-bounces at mailman.qth.net <boatanchors-bounces at mailman.qth.net> on behalf of David Stinson <arc5 at ix.netcom.com>
Sent: Sunday, September 9, 2018 12:02
To: boatanchors at mailman.qth.net; milsurplus at mailman.qth.net
Subject: [Boatanchors] Dynamotor Power Supply.

This is my SCR-274N  (HF Only configuration):
https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fphotos.app.goo.gl%2Fun2hHT2vFDizxLLU8&amp;data=02%7C01%7C%7C2a83ea55a0394e9eaaa608d61676463e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636721094564989945&amp;sdata=fFTYclOD1BFkSnj1LdgTwGFp0aENNArPeaPPl9JzJTo%3D&amp;reserved=0

This is the power supply that runs the
entire set with no dynamotor problems (as long
as it has the two big "starter" caps on it:
https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fphotos.app.goo.gl%2FCuiW2Qmu14zKafW9A&amp;data=02%7C01%7C%7C2a83ea55a0394e9eaaa608d61676463e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636721094564989945&amp;sdata=AiTD%2BPvAEkYA1Q5Wj8IALjA0NU43VqbBVFH8tEncvPE%3D&amp;reserved=0

It is made by Astec, two 24V at 15 amps which I
"tweaked" to 26V.  Googled info on it.
You have to use a small ribbon cable between the
two supplies to get them to load-share.
https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fphotos.app.goo.gl%2F5nzd88GhQoHRJJNk9&amp;data=02%7C01%7C%7C2a83ea55a0394e9eaaa608d61676463e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636721094564989945&amp;sdata=lY4hw4leypMdmxSVKTPvYCa3wvXKI0YicNx30vecvJ0%3D&amp;reserved=0

Each supply has a 100,000 uFd 30 VDC (40 surge)
"computer printer" cap across it for surges.
It starts all the 274N dynos all at once without
any trouble, but will not start the BC-375 dyno.
For that, I use a Astron 28V at 50 Amp with the
"battery charger" option across two lawn tractor
batteries, float charge set at 27V.  It does
the job well for the 375 and the ATD ( I think
the ATD would start with the 274N supply).

These ASTEC supplies show-up on Ebay from
time to time.  Just have to keep an eye out.

GL OM ES 73 DE Dave AB5S