Looking for an IBM 3803

Patrick Finnegan pat at vax11.net
Mon Sep 6 08:50:02 CDT 2021

On Mon, Sep 6, 2021, 06:36 Curious Marc via cctalk <cctalk at classiccmp.org>

> I got both the 3420s and the 3808 from Sellam. On the restoration docket,
> now with a better chance thanks to the ALDs which I recently got from
> Gabriel himself. I scanned my 3420 ALDs and gave them to Gabriel in return.
> Biggest annoyance, besides humongous size and weight, is the amount of 3
> phase power required.

>From what I remember, the only thing that requires 3 phase in the whole
system is the blower motor in the 3420 drives. The rest are powered off of
single phase 200-240VAC.

The large 3 phase input on it 3803 is likely overkill for even a controller
and full string of 8 drives. It's easier to oversize things and have a 3x
safety margin, then deal with running close to the limits and risk any
problems from poorly installed site wiring.



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