On Tue, 22 Nov 2016, Greg Bentzinger wrote: > Date: Tue, 22 Nov 2016 22:54:55 +0000 (UTC) > From: Greg Bentzinger <skullwo...@yahoo.com> > To: "emc-users@lists.sourceforge.net" <emc-users@lists.sourceforge.net> > Subject: [Emc-users] Wiring up a 7i77 > > This feels like someone just dumped a plate of Spaghetti in my lap. It is > overwhelming. Of course every manufacture has to adopt different terms for > the same type of signals which doesn't make things any easier. > > So first problem is deciding the best method for interfacing the TECO > FM50-203 VFD (3Hp - 2.2Kw). This is a very basic VFD that is often wired with > a SPDT switch for direction and a pot for speed. The front panel terminal > block sources 12VDC for switch closures, but the inputs are 24V tolerant for > external wiring. Max Hz is set as a parameter then scaled to a 0 to 10V and > can accept 12V for max speed. The technical details in the manual are very > sparse and from what I can gather the speed input is not tolerant of negative > voltage. Direction appears to be controlled solely by a FWD or REV inputs. > > Currently I have the accel and decel times set to ramp up to 60Hz over 3 > seconds and using the front panel control buttons to manually operate the > unit. There is no breaking resistor installed yet as I will need the machine > running to fab mounts. I only intend to control spindle motor On|Off and > direction. My Hurco KM3 is like a Bridgeport and uses variable pulleys to set > actual spindle speed. > > I have a 5VDC power supply feeding TB1 on the 7i77, and a 24VDC feeding TB2 > pins 1-5. I have not applied power as yet (nervous)! If I am reading the 7i77 > manual correctly the TB7/TB8 will require 24V based inputs to be seen. My > limit switch wiring is all 5VDC and there is only a single +5VDC feed to the > servo which drives both the encoder and limits. Knowing this should I not use > the 5V on TB3 to power each encoder and limit and use power from TB1? Also, > will I need to use relays to bring the six 5V limit switch signals to 24V? > One last item on my wish list of questions. The CMC/Randtronics Servomate > amps have a voltage output (not sure if its -10V -0V- +10V or just 0-10V) to > indicate actual servo load, can the analog voltage sensing inputs read this > such that I could use the feedback for a GladeVCP loadmeter panel? > > > I know just enough to be scared of all the possible ways to cause a magic > smoke event. I feel like I'm tip toeing through a mine field. > > > Not too far down the road once the machine is running in a basic config I > will need to wire in the M7, M8 and a MPG > > For now I just need to get up and running enough to use a single tool, > cutting dry to machine the hinge mount surfaces on a batch of cast iron parts. > > I did a stepper based machine conversion back about Ver 2.3, but this is a > whole new ball game when you have to reverse engineer some of the existing > hardware. > > Thanks for any advice. Happy Holidays in advance. > > Greg, Out yonder in Yoder, Colorado.
If the limit switches are mechanical, I would wire them for 24V 5V limits are not great from a noise/contact perspective > > ------------------------------------------------------------------------------ > _______________________________________________ > 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. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
