Once in a while motor spins fast unable to find index

[Natasa]

The problem with my motion controller is that sometimes can not find home/index  My theory is that if home count is only one count behind the current count  motor goes forward and winds up very fast for about 360 degrees and after that motor drive gets disabled. Can I enabled it to look for home/index forward and backwards?This has happened three times for the last two weeks and it is hard to debug and troublesome to get system back in operation. I'm new to this program and every suggestion is appreciated.

Natasa

[Jochen]

Natasa,

it sounds very strange that the motor winds up very fast. If the board doesn't find the index (by the way: what board type and NI Motion driver version are you using?) it simply should report this issue but it shouldn't run into a following error. In fact this sounds more like a problem with missing encoder feedback.

• Is there a chance that there is a loose connection or a functional problem with the encoder?
• Do you receive an error message (Please check for modal errors)?
• Please check the status of the axis in MAX (1D Interactive).

Best regards,

Jochen Klier
National Instruments Germany

[Natasa]

Hello,

Thank you for your input.

I am using NI 7344 board with Flex Motion 4.5 software and the problem is still here, only now is more often. I put hardware limit switch to disable the motor after it runs out of position but I still didn't figure out the root cause of this.

I have absolute encoder giving me home position and incremental encoder to do the motion, and I can not find out which one is causing motor to continue past programmed travel.

Software limit switches so far did not give me any results.

How can I get Error Monitor.flx to work?

Thanks,

Natasa 

[Jochen]

Natasa,

before you go on with your investigations you definitely should upgrade the NI-Motion driver. Version 4.5 is more than 6 years old. The latest version is 7.2. This version brings a lot of improvements and bugfixes, especially in the board's firmware.

Best regards,

Jochen Klier
National Instruments Germany