Before it. Literally run a green wire from the X2 terminal to the single point ground or to the steel backplane assuming you have one.
The protective fuse on X1 should be prior to the filter also. Dave On 1/2/2016 7:26 AM, John Thornton wrote: > I do have a "control transformer" which can be identified by the three > fuses on top. One for X1 (secondary) and one each for L1 and L2. I > went back and found out which was X1 and X2 and will correct my wiring > today. My question is I have a filter on X1 and X2 should I ground > before or after the filter? > > JT > > On 1/1/2016 6:41 PM, John Kasunich wrote: >> 120V transformer secondaries (in the USA) need to be grounded on >> one side, even if they are part of a machine control panel. >> >> Such transformers are referred to as "control power transformers" >> and traditionally powered electro-mechanical control devices such >> as relays and contactors. Today they still power those things, and >> they also power AC-to-DC supplies that run the electronic parts of >> the control. The low voltage DC power distribution (typically 24V) >> is sometimes un-grounded, sometimes single-point grounded, for >> exactly the noise reasons Berthos mentions. But the 120V "control >> power" isn't used a the "reference" for anything - it is still "dirty" >> power, although not as dirty as the main power that might be going >> to a VFD or whatever. > > > > ------------------------------------------------------------------------------ > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
