On Sat, 4 Dec 2010 11:07:54 +1000, Shane wrote: >On Fri, 3 Dec 2010 18:54:31 -0500 >Tony Harminc wrote: > >> On 3 December 2010 16:36, Pommier, Rex R. wrote: >> >> > One phase of the 3-phase power was out. Think 3380 disks that >> > (according to rumors propagated by my CE at the time) have to be >> > wired correctly so they don't spin backwards. >> >> I can say from personal experience that the motor in a 3211 printer >> will run backwards if any two of the three non-neutral wires are >> interchanged. > >(At least) one of the Amdahl disks had no phase protection and would >run backwards. Might have been the 3380 look-alike. > An ex-CDC CE described a similar behavior of CDC tape drives. He checked the phase before installing. Found a bad one. The union electrician tried the contacts pairwise with a voltmeter; 208 volts for each pair. Perfectly in spec; no problem recognized. In New York, you don't argue with the shop steward. Bob went in off-shift and rewired the outlet.
The CDC mainframes were liquid cooled. I don't know how the jurisdictional disputes were resolved. 308x must have had similar conflicts. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
