From sheldondaitch at yahoo.com  Sun May 26 23:03:30 2019
From: sheldondaitch at yahoo.com (Sheldon Daitch)
Date: Mon, 27 May 2019 03:03:30 +0000 (UTC)
Subject: [Motorola] Motorola HPN3000A
References: <1318398577.1670191.1558926210677.ref@mail.yahoo.com>
Message-ID: <1318398577.1670191.1558926210677@mail.yahoo.com>

I finally dug out one of my HPN3000A power supplies, which had the USA 120VAC plug on the power cableand in verifying that the set up for the input voltage was correct for 120VAC, I notice there was no JU-1on the terminal strip.

What JU-1 does, in the 120VAC configuration, is to parallel the two 120VAC primary windings.

In theory, the power supply will work with only one of the 120VAC windings connected, but with only one windingbeing fed, the rating of the transformer is decreased.??

I checked power draw by the unit with only one winding and then with the jumper in place, two windings in parallel,and the VA is the same.

Is there any reason to believe Motorola shipped these units for 120VAC without the jumper in place?
Inquiring minds.
73
SheldonWA4MZZ