Looking for an IBM 3803

William Donzelli wdonzelli at gmail.com
Mon Sep 6 09:20:25 CDT 2021

> 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.

It is overkill, but a full string can really punish the circuit
breaker with enormous current surges. Better to overdo it with a
breaker that can handle the spike of all eight 3420s deciding to do
some reversing within a few seconds of each other.

Even a simple setup with a 3803 and a single 3420 will create large
surges that a household circuit may not like much.


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