On Thu, 12 Jan 2012, Viesturs L?cis wrote: > Date: Thu, 12 Jan 2012 17:43:21 +0200 > From: "[UTF-8] Viesturs L?cis" <viesturs.la...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Servo drive? > > 2012/1/12 andy pugh <bodge...@gmail.com>: >> On 12 January 2012 15:27, andy pugh <bodge...@gmail.com> wrote: >>>> Is it supposed to receive any additional 5V, 12V or something similar >>>> for logic power? >>> >>> Yes, Vdd. >> >> On reflection, it might be wise to use a DC/DC convertor for Vdd, so >> that it has a floating, isolated logic power, that can be safely >> referenced to PSU gnd. >> > > And how much would such a convertor cost? I would need to convert > 330VDC to 12VDC. > > Since I have to connect controller's GND to Vss, I could take +12V > from PC PSU for logic power. But that introduces a risk of burning > down a PC, if something happens in the chip, so I could sacrifice a PC > PSU just for +12V supply to the logics of these chips. > > Viesturs
Yow! Yow! Yow! Dont even think about running a line operated drive with a PC power supply _Everything_ connected to the IRAM module must be isolated with a minimum test voltage of 3750VAC from low side control and 2500VAC from ground! I am advising against this unless you are familiar with high voltage high power circuits, isolation circuits, and guaranteeing that DC-DC converters and isolators to not fail in such a way as to compromise isolation. > > ------------------------------------------------------------------------------ > RSA(R) Conference 2012 > Mar 27 - Feb 2 > Save $400 by Jan. 27 > Register now! > http://p.sf.net/sfu/rsa-sfdev2dev2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ RSA(R) Conference 2012 Mar 27 - Feb 2 Save $400 by Jan. 27 Register now! http://p.sf.net/sfu/rsa-sfdev2dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
