24 Nov
2014
24 Nov
'14
1:20 p.m.
On Nov 24, 2014, at 12:28 PM, Johnny Billquist <bqt
at update.uu.se> wrote:
Stuff I know need 3-phase:
VAX 86x0 machines. They have 3-phase motors for the fans. (Don't wire things up
backwards, or your airflow will run backwards, which is not good.)
RP06 disk drives. They use 2 phases for their motors.
I wasn't aware that the KL needs 3-phase, but it might just be that the power
supplies are large enough, and complicated enough, that you can't just rewire them.
The main DC supply for the KL CPU requires 3-phase. It uses a ferro-resonant transformer
and that requires 3-phase. There are also a number of 3-phase fans.
Since I don't have 3-phase at my shop, I'm planning on re-doing my KL's power
supplies to be modern switchers run off of 240v (to keep the current draw lower). That
and replacing the 3-phase fans should allow me to run my KL from 240v.