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. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
