I'm pulling my hair out trying to determien what's causing intermittent dropping of a small 4-node Sercos network in one of our filling machines. The filler manufacturer has, so far, been unable to solve the issue so I'm hoping someone on this forum can point me in the right direction.
Trying to itemize all the things I've tried would take hours, so I'll be pretty general.
The four Ultra3000 drives (2089-DSD-020-SE) are connected with fiber to a 1756-M08SE Sercos module. The module is in the last slot of a 13-slot Contrologix rack.
Some of the most recent things we tried were:
Any suggestions? We've easily spend $20K+ on parts, not to mention untold hours of troubleshooting and machine downtime.
I can send a copy of the most recent version of the Logix5000 program to anyone who would be willing to take a look.If you're looking for work and have confidence in your ability to solve the issue, PM me and we'll arrange a contract.
Trying to itemize all the things I've tried would take hours, so I'll be pretty general.
The four Ultra3000 drives (2089-DSD-020-SE) are connected with fiber to a 1756-M08SE Sercos module. The module is in the last slot of a 13-slot Contrologix rack.
Some of the most recent things we tried were:
- Every fiber cable has been changed
- The direction of the fiber network has been reversed and changed back
- Every Ultra3000 drive has been changed with a new replacement
- A new 1756-M08SE was installed
- A new 1756-A13 rack was installed
- A new 1756-L61 CPU was installed
- A new power supply has been installed
- Every possible combination of firmware for the CPU and Sercos module. Current CPU Rev = 17.5 and Sercos Rev = 18.5. Like I said, firmware versions don't seem to make any difference
- Cycle times of 0.5, 1 and 2ms were tried
- High and low transmit power was tried
- I didn't adjust "transition to phase" - it's set to "4"
- A copy of a "similar" program from another filler of the same generation was provided by the manufacturer. The logic matches, but a lot of the settings under Motion Groups - AxisMotionGroup are different. I tried the settings from the new program, but get approximately the same results.
Any suggestions? We've easily spend $20K+ on parts, not to mention untold hours of troubleshooting and machine downtime.
I can send a copy of the most recent version of the Logix5000 program to anyone who would be willing to take a look.If you're looking for work and have confidence in your ability to solve the issue, PM me and we'll arrange a contract.