Sender: eric@ruckus.brouhaha.com From: Eric Smith Newsgroups: alt.sys.pdp10 Subject: RP06 power requirements (was Re: RM03 on a KS10) References: Organization: Eric Conspiracy Secret Labs X-Eric-Conspiracy: There is no conspiracy. Date: 12 Nov 2001 13:48:54 -0800 Message-ID: Lines: 27 User-Agent: Gnus/5.0807 (Gnus v5.8.7) Emacs/20.7 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii NNTP-Posting-Host: ruckus.brouhaha.com X-Trace: 12 Nov 2001 13:49:14 -0800, ruckus.brouhaha.com Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!enews.sgi.com!news.spies.com!ruckus.brouhaha.com Xref: chonsp.franklin.ch alt.sys.pdp10:7543 m_thompson@NOSPAMids.net (Michael Thompson) writes: > The Rhode Island Computer Museum has a KS10 (and Megan Gentry's ADP > KS10). They don't have three-phase power available so using the RP06 > disks is a problem. This is a common myth. The RP06 does NOT need three-phase power, though that it is how it is normally wired. You don't even need a capacitor-start arrangement to produce "fake" three-phase, because the drive doesn't even use the third phase. The RP06 motor only has a single winding, which is wired between two of the phases. For normal US three phase power, this is 208V. But according to the Memorex 677 drive manual (included in the DEC maintenance docs), the motor will actually run on a wide range of voltages, including 220-240V. I don't recall the limits of the range. The electronics runs between one phase and neutral on 120V. So a split-phase 120V/240V circuit (with neutral) would work fine. If you have a 240V circuit with no neutral, you could use a 2:1 step-down transformer to power the logic, or it might be possible to reconfigure the electronics power supply for 240V. The RP06 also has a three-phase "output" for daisy-chaining a second drive. (You're not supposed to put more than two drives in a power chain.) This is simply the three input phases permuted so as to distribute the load. ###### Sender: prep@k9 Newsgroups: alt.sys.pdp10 Subject: Re: RP06 power requirements (was Re: RM03 on a KS10) References: From: Paul Repacholi Message-ID: <87g07j8lzn.fsf@prep.synonet.com> Lines: 23 User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Organization: iQnet Cache-Post-Path: angelina.pe!unknown@p229.perth02.dial.usertools.net X-Cache: nntpcache 2.3.3 (see http://www.nntpcache.org/) Cache-Post-Path: news.satix.net!unknown@203.132.92.2 X-Cache: nntpcache 2.3.3 (see http://www.nntpcache.org/) NNTP-Posting-Host: news.satix.net X-Trace: ozemail.com.au 1005618190 203.132.96.3 (Tue, 13 Nov 2001 13:23:10 EST) NNTP-Posting-Date: Tue, 13 Nov 2001 13:23:10 EST Distribution: world Date: 13 Nov 2001 10:04:28 +0800 Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!HSNX.atgi.net!newspeer.cwnet.com!sjc1.nntp.concentric.net!newsfeed.concentric.net!newsfeed.ozemail.com.au!ozemail.com.au!not-for-mail Xref: chonsp.franklin.ch alt.sys.pdp10:7527 Eric Smith writes: > The RP06 motor only has a single winding, which is wired between two of > the phases. For normal US three phase power, this is 208V. But > according to the Memorex 677 drive manual (included in the DEC > maintenance docs), the motor will actually run on a wide range of > voltages, including 220-240V. I don't recall the limits of the range. I have two PR06s and a 677. All the motors are 3 phase. > The electronics runs between one phase and neutral on 120V. So a > split-phase 120V/240V circuit (with neutral) would work fine. Yep, you should be able to re-jumper the PS to 220v or 110v. Or 240v like over here. We do have 3 phase as 'standard', even into many homes though. -- Paul Repacholi 1 Crescent Rd., +61 (08) 9257-1001 Kalamunda. West Australia 6076 Raw, Cooked or Well-done, it's all half baked. EPIC, The Architecture of the future, always has been, always will be. ###### From: Wilber Williams Newsgroups: alt.sys.pdp10 Subject: Re: RP06 power requirements (was Re: RM03 on a KS10) Date: Thu, 15 Nov 2001 20:19:10 +1000 Organization: The University of Queensland Lines: 33 Message-ID: <3BF3969E.3FAD32B1@its.uq.edu.au> References: <87g07j8lzn.fsf@prep.synonet.com> NNTP-Posting-Host: chook.cc.uq.edu.au Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: bunyip.cc.uq.edu.au 1005819613 3450 130.102.128.100 (15 Nov 2001 10:20:13 GMT) X-Complaints-To: news@uq.edu.au NNTP-Posting-Date: 15 Nov 2001 10:20:13 GMT X-Mailer: Mozilla 4.78 [en] (Win98; U) X-Accept-Language: en Path: chonsp.franklin.ch!pfaff.ethz.ch!news-zh.switch.ch!news-ge.switch.ch!kanja.arnes.si!news-hub.siol.net!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news1.optus.net.au!optus!bunyip.cc.uq.edu.au!not-for-mail Xref: chonsp.franklin.ch alt.sys.pdp10:7595 See if http://chook.cc.uq.edu.au/In%20Progress/EK-RP056-IN-001%20RP05%20%26%20RP06%20Disk%20Drive%20Installation%20Manual.pdf or http://chook.cc.uq.edu.au/In%20Progress/Memorex%20677-01%20DEC%20and%20677-51%20DEC%20Disc%20Storage%20Drives%20Technical%20Manual.pdf have anything useful... Wilber Paul Repacholi wrote: > > Eric Smith writes: > > > The RP06 motor only has a single winding, which is wired between two of > > the phases. For normal US three phase power, this is 208V. But > > according to the Memorex 677 drive manual (included in the DEC > > maintenance docs), the motor will actually run on a wide range of > > voltages, including 220-240V. I don't recall the limits of the range. > > I have two PR06s and a 677. All the motors are 3 phase. > > > The electronics runs between one phase and neutral on 120V. So a > > split-phase 120V/240V circuit (with neutral) would work fine. > > Yep, you should be able to re-jumper the PS to 220v or 110v. > Or 240v like over here. We do have 3 phase as 'standard', > even into many homes though. > > -- > Paul Repacholi 1 Crescent Rd., > +61 (08) 9257-1001 Kalamunda. > West Australia 6076 > Raw, Cooked or Well-done, it's all half baked. > EPIC, The Architecture of the future, always has been, always will be.