Looking for VAX6000 items (Paul Koning)

Paul Koning paulkoning at comcast.net
Thu Jul 15 15:22:41 CDT 2021

> On Jul 15, 2021, at 4:19 PM, Michael Thompson via cctech <cctech at classiccmp.org> wrote:
>> From: Paul Koning <paulkoning at comcast.net>
>> To: Chris Zach <cz at alembic.crystel.com>, "cctalk at classiccmp.org"
>>        <cctalk at classiccmp.org>
>> Subject: Re: Looking for VAX6000 items
>> A number of the large disk drives use 3 phase motors; RP04/5/6 are
>> examples as well.
>> Three phase motors won't run on single phase power without help from run
>> capacitors.  (There is no such thing as "two phase power" -- 220 volts is
>> single phase, balanced.)
>>        paul
> The RP06 uses 220VAC single phase motors for the spindle and blower.

Interesting.  I distinctly remember a disk drive installation manual that warned about phase order.  Perhaps that was for the RP04 and not the RP05/6 ?


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