8 Sep
2021
8 Sep
'21
8:45 a.m.
The easiest thing to do is to pick up some cheap VFDs which will take 1ph
in and put out 3ph to run the blower motor.
Patrick Finnegan
On Wed, Sep 8, 2021, 11:34 Chuck Guzis via cctalk <cctalk at classiccmp.org>
wrote:
As long as you don't need the full blower
capacity, you can probably do
the 3-phase-to-single-phase trick by using a capacitor from the third
lead to either (which one will determine rotation direction) of the two
other leads and feeding those leads with single-phase. It's done very
often here with 3-phase shop equipment acquired by residential
hobbyists. For motors, it's not critical, but it's not something that
you'd want to do for electronics--the phase distortion rules that out.
--Chuck
On 9/7/21 11:31 PM, Curious Marc wrote:
Yes, we are hoping that we can power the blower
with 3 phase and the
rest directly from the 240V electric car circuit? Not sure if that can
be rewired for that.
Marc
> On Sep 6, 2021, at 6:50 AM, Patrick Finnegan <pat at vax11.net> wrote:
>
> ?
> On Mon, Sep 6, 2021, 06:36 Curious Marc via cctalk
> <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
>
> 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.
>
> Pat
>
>
--
--Chuck
Sent from my digital computer