PDP-11 power requirements

[Allison]

Ethan Dicks wrote:
> On Thu, Feb 5, 2009 at 1:47 PM,  <tiggerlasv at aim.com> wrote:
>   
>> I can't speak towards the older, larger Unibus models,
>> such as the 11/45, 11/55, 11/60, and 11/70.
>>
>> However, these models generally had a standard 115volt line cord:
>>
>>
>> 11/02    11/03     11/23    11/23+   11/24
>> 11/34     11/34a   11/44    11/53     11/73
>> 11/83     11/84     11/93    11/94
>>
>> If it's in a rack, it MAY have a power distribution module
>> at the base, with a 20-amp or 30-amp power cord, but
>> in most (if not all) cases, the individual chassis inside the rack
>> will have standard 115volt line cords that plug into it.
>>     
>
> My Unibus machines are racked, not loose, but I _thought_ that the
> 11/44 and perhaps the 11/24 had a 20A 115V plug (i.e.   -- |   vs  |
> |  ).  Mine go into a power distribution box at the bottom of the rack
> and I haven't unplugged them in a long time, but that's what I recall.
>
> Little stuff like the 11/34 and 11/04 in BA-11s use "standard" US 15A
> 110V plugs, though, as would anything in a BA23 (Qbus, large and
> small).  I don't know anything about the newer stuff after the 11/73,
> though.
>
>   
Anything in a BA11, BA23, BA123, BA213 are 110V at 15a or 220-240 at 7A
requirement though most had cord sets for local power. for USA that meant
15A outlet.  Most all Qbus fits that (exception was a 48V DC flavor for 
telco).
The larger set of PDP11 were 15A or could run on 15a (plug change) as
only the monsters drew full requirement.

I ran a 11/730 two cab (730, RA81 and two RL02) on 15A in the lab for years.
Even though the book says 30A outlet.

Allison

> -ethan
>
>