They may be using polyfuses in their design, which restore the path when the overload goes away. They look very different than traditional fuses.
Ray --J. Ray Mitchell Jr. jrmitche...@gmail.com (818)324-7573 The things we admire in men, kindness and generosity, openness, honesty, understanding and feeling are the concomitants of failure in our system. And those traits we detest, sharpness, greed, acquisitiveness, meanness, egotism and self-interest are the traits of success. And while men admire the quality of the first they love the produce of the second. -John Steinbeck, novelist, Nobel laureate (1902-1968) On Fri, Jan 16, 2015 at 8:52 AM, Kirk Wallace <kwall...@wallacecompany.com> wrote: > On 01/15/2015 11:32 PM, Marius Liebenberg wrote: > ... snip > > I use similar drives all the time and I put 110vdc on a 80vdc drive > > the other week. > > The cover shows 80VAC max. which would be (80 * 1.4 =) 112VDC max. and > shows 110VDC max on the cover. > > > I thought that the drives was cooked but when I tested it with the > > correct voltage it was fine. It seems that hey have an input current > > and voltage sensing circuit and will not damage easily. > > I took the cover off to see inside. I need to take some close up > pictures to document the various bits. > > > > Most of these drive originate from the same factory and my exerience > > with them has been very good. Some of them does have a fuse on the > > pcb. > > I looked for a fuse but didn't find one, although giving it more thought > a fuse these days might look like a SMT resistor. I'll have to look closer. > > > > I did break one drive when I unplugged the motor while the drive was > > still under power. > > There was some chatter on the CNCzone/Tormach forum recently about > unplugging a fourth axis and killing the driver. Some people said they > do it all the time, which sees hard to believe. It came to mind that it > would be nice to have the connector latch interlocked with the drive > power so the drive is turned off well before the connector breaks output > contact. > > -- > Kirk Wallace > http://www.wallacecompany.com/machine_shop/ > http://www.wallacecompany.com/E45/ > > > ------------------------------------------------------------------------------ > New Year. New Location. New Benefits. New Data Center in Ashburn, VA. > GigeNET is offering a free month of service with a new server in Ashburn. > Choose from 2 high performing configs, both with 100TB of bandwidth. > Higher redundancy.Lower latency.Increased capacity.Completely compliant. > http://p.sf.net/sfu/gigenet > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ New Year. New Location. New Benefits. New Data Center in Ashburn, VA. GigeNET is offering a free month of service with a new server in Ashburn. Choose from 2 high performing configs, both with 100TB of bandwidth. Higher redundancy.Lower latency.Increased capacity.Completely compliant. http://p.sf.net/sfu/gigenet _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
