Motion Control and Motor Drives | Forum profile

Hi Vivek-   This is the same problem that happens if I shut down the PC with the drives powered.  It has been like that from day one(6 years+) on all 6 machines that use this card.  The Labview program may or may not be running when this happens.  If it is, it is only polling the card for position.  Maybe it is a drive issue.  If something isn't actively holding the step input at a given state, maybe noise takes over and the axes...

Hi Brian,   I would simply try disconnecting the cable from the motion controller card. If you still see the motor moving, there is definitely a voltage that is output from the drive regardless. If that is the case, I would try checking the confiugration of the drive. It could possibly be a faulty drive as well.   

Jochen,   Thank you very much for your time. You are right, I was surprised that the shipping example came with a regular loop too. I got to be infront of the hardware yesterday and it worked fine with the examples and with my modified examples. I will study more the concepts you recommended earlier for the final application.   Marti, FYI. The link you suggested is the same page you get to by going  to ni.com/info and entering info code...

Hey Sahil,   NI Spy keeps track of any NI VISA calls you make. This is why you can monitor the calls to your device from NI software. A serial port monitor is not really something new, there are plenty of offerings if you do a simple Google search for 'serial port monitor'. The goal of this serial port monitor is to see what your third party software that seems to be working is sending to your device; then comparing that to what...

As said, for simple monitoring tasks, your approach works fine and there are no significant disadvantages. Things change, if you need to transfer data to the host at higher rates and with deterministic timing. In this case you should refer to the concepts, that are explained in the examles, that I have linked in my last post.    To answer your question about the main loop: Indeed you have to use a timed loop that is synchronized to the scan...

Hey, Brian Beal,   Thanks for your quick response. "accel" and "decel" mean acceleration and deceleration, am I understanding right?   If yes, then I don't have these in my LabView program, I just generate one TTL pulse train and one TTL pulse with LabView and send them into the SMD1 stepper motor driver. The pulse train steps the shaft, and the other switchs the direction.   Yesterday, I confirmed that if the...

hiii BEN   thanks for yours help ... i am now able to run the stepper motor.... the problem was simple ... here i will say that analysing the actual problem is  half the race won..... once again i will say that i am too much thankful to you and also waterloo labs.  

Hi saifizi,   This is the expected result.   The input of both motors are practically the same. This is the reason why your controller still works. The difference, naturally, would be the response. Applications using a continuous servo motor, usually, seeks to accurately control the rotational velocity and not the position. This is the reason why the motor runs continuously when activated (hence the name).   If you really need to control...

Hi,   Getting the system on to a "real" motion system should be relativetly simple, just follow the steps at this link:  Moving NI Motion Examples to Motion Hardware   The examples, while they are not always exactly what your application is, are generally optimized already, but if you run into issues we can always look into altering them.     Cheers,   

JeffL,   I have spent some time and it appears that we are not getting any signal thru the UMI-7644.  Voltages are constant when it is turned on and a motion is sent via either a VI or through a MAX command.     We were running along fine until the HD on the machine the PCI-7344 was in died.  We then put the card into a new machine with Windows XP, updated all the drivers and firmware and went to Labview 7.x.  Since the HD crashed...