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Messages - geh7552

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141
General Mach Discussion / Re: sizes aren't correct anymore please help !
« on: December 20, 2014, 07:12:28 PM »
If the error is repeatable it sounds allot like the "steps per unit" is not correct and its a compound error problem. Meaning the farther the axis moves away from home or zero the more error is developed. The other key piece of info you posted, is you made allot of changes to your driver board settings and Mach 3 kernel speed and who knows what else.

I would do the stepper per unit math and get a baseline number to use in motor tuning window and start from there. Then using the Mach 3 step axis calibration function and move 6 or 10 inches and see what the error is. I have a 12" digital caliper I use to calibrate my steppers.

Moving the axis 0.100 or 0.900 is not really far enough to get a accurate error measurement because the accumulated error is very small at that point. Being off 0.04 @0.900" and 0.02 @ 2" I'm willing to bet its way off at 6". 

142
General Mach Discussion / Re: MACH 3 hung
« on: December 20, 2014, 06:33:43 PM »
What ver of Windows? Is this the only program that won't launch? Sounds like a corrupt USB driver or a conflict issue. Even uninstalling bad drivers sometimes won't fix the problem. If you created a restore point before updating the driver (which should always be done) you could roll back to a previous date and see if that corrects it.   

143
General Mach Discussion / Re: sizes aren't correct anymore please help !
« on: December 17, 2014, 03:38:19 PM »
Unless you are running the steppers at high speeds you shouldn't need over 25khz in most cases. Sounds like your xml file is corrupt probably from making numerous Mach program changes trying to solve a mech problem. Rewriting over any existing profile can sometimes cause strange problems. I would suggest creating a new profile and start fresh and reset the stepper driver back to original settings. Once the problems are solved make a backup copy of the profile.  

144
General Mach Discussion / Re: Siemens S7-300 PLC & Mach3 system with CS Lab
« on: December 03, 2014, 03:49:07 PM »
Siemens uses profibus or simolink as a standard. Modbus cards are available but not cheap as is most things related to Siemens product. I would look at Automation Direct PLCs as a cheaper and better alternative to Siemens. The S7-200 are an obsolete product and the S7-300 series on the way out as well.      

145
You made two major changes and now have a problem you didn't have before. First, why did you swap motors and controllers if the machine was working ok? Its now a process of elimination.  I would reinstall the original stepper controller and see if the problem disappears. Next reinstall the NEMA 34 motor if that cures the issue. Computer power supplies are switching type and aren't desirable for stepper controllers.   

146
That's because spinning by hand you mitigated the rotor starting inertia and once turning the powered 2 phases can overcome the rotor mass so the drive current is pretty low. Probably around 0.2 amps so no red tripping light. As the motor is loaded such as cutting with a tool bit will cause the amps to increase to the point of tripping the drive or just stall the motor. That's why the trip light is flickering trying to start without manually spinning the rotor.  

I seen two identical 2.2kw spindle motors wired differently at the motor connector plugs. Apparently the Chinese don't have standards.  :o  The CNC machine should have been tested before it left the factory.


147
You either have a open motor winding or bad connection between the drive and motor. The motor connector plug has 4 female terminals pins and only 3 are used for the motor windings. My bet is the motor connector plug is miswired. Meaning only 2 of the 3 terminal pins are connected to the motor windings. Its very easy to miswire the terminal pins. The Chinese spindle motors don't have connection diagrams, you have to remove the screws on the motor male connector plug and lift it up to see what 3 pins are being used. Then solder the leads coming from the drive on the corresponding female connector pins.  

At 400hz the motor rotor is locked with full 230V... at 100hz its only about 57V so its easier to turn by hand. A 3 phase motor will run on 2 phases if spun to start however, it will quickly damage the motor because of overcurrent on the 2 powered phases. That's why the red "Trip" light is flickering on the drive.

If the drive overcurrent protection parameters are set correctly for the motor full load amps the drive should trip on overcurrent.

148
Just watched the video. A flickering "Trip" light is not a good sign. When the drive on and set for 400hz can you turn the motor shaft? Is the motor locked or does it spin freely? I would check all the motor connections. A remote possibility is the drive output section is bad. The only way to tell is use a voltmeter and measure the drive output between T1,T2 and T3. Then ohm the motor for an open phase winding. If it's new I would contact the seller.

149
I just checked the website. They sell complete packages and assume the drive should be should be setup and the motor tested. 3 phase motor will hum and not turn if missing a phase. The drive should fault out on over current too. Any error codes showing up on the drive display?

150
1) The VFD parameters have to be set up for the motor. 2) The motor is 3 phase it could be missing a phase or miswired at the motor connector.

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