I always suggest user to load at least one picture--see my tip on the top of SINUMERIK.

However in your case , Please load one picture of your Drive system , from left to the right .

I guess you have SIMODRIVE 611A, which is analog drive. I want to see your picture to make sure.

Your case is typical disadvantage of analog drive---drifting speed loop, when temperature changed , (you said working within 8 hours is fine) . tuning drive is one solution, but change to digital will be easy to eliminate that . 

for your machine (if 840C version higher than V5.x ) it will be possible upgrade to Digital drive. you need thinks about cost vs the importance of your machine--as all motor and control card should be change.

smislawd

Hi dear all

I have old 840 C controller with 7 axis machine and I am facing below alarm 

Zero-speed control and some times Contour monitoring

below all possibilities i checked found normal 

1. Axis mechanical jammed or block.

2. axis timer belt found ok

3. Interchanged  control card and LT Module 

4. check Earth Nutral Volatge It is  0.4 Volt 

5. Machine have UPS online supply and also Double Separate erathing

6. Check Back lash found within tolerances 

But still problem is at is. 

Conclusion :- Same problem is transfer to other axis means i have earlier problem with W axis. then it comes on U axis and now it is shifted on Z 3 Axis ,In that case erlier faulty axis working normal.

Also Faulty Axis (+) side working jerky and (-) side generates above alarms 

But if i have power off machine for at least 30 min then machine will work for 8-10 hrs OK 

Please suggest if any idea. 

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Split from Sinumerik 840C Contour monitoring.