Sometimes S120 Running On His Own Decision

Hello!!!

I'm Using CU310 DP With PM340 Power Module For One Of Auto Feeding Of Metal Sheet To Press 

Press Controling By CUP1215 Drive And PLC Communicates Through PROFIBUS ...Sheet Movement Calculated By External Encoder  ...Its Connected To X23 Port Of CU310

For Manual Mode Of Operation I'm Using  Motor Encoder, For Auto Operation I'm Using External Encoder (It's Only For Smooth Movement In Manual Mode Or Jog Mode )

Now My Problem Is Sometimes Drive Running On His Own Decision...With Some What High Speed 

Its Not Happening On Regular Basis But It's  Happaning.....

Alarm History Saying Following Error Too High ...

Both Motor And External Encoder Are Incremental Encoders

Sorry For The  Big Story 😌

Does it happen while moving? Or while the drive is standing still?

Does it travel same direction? Or opposite?

The following error is the side effect not the cause I think.

Hello

Thanks ...

1)Does it happen while moving? Or while the drive is standing still?-

Yes Its happening While Moving

2)Does it travel same direction? Or opposite?

Same Direction

Regarding Following Error I Have Thoughts Like Yours....

Hello Tech Team 

Thanks For Your Reply 

Actually Its External Encoder Application...So I Have Set Maximum Value For Following Error 

Really I Don't Know What I Need To With Trace 

The Servo Will Run In Only One Direction 

I Haven't Enbled Modulo Axis Function 

I'm Thinking These Maybe A Reason ...😇

... if you have an external encoder which could have an error (where the actual position jumps to 0) a big position deviation occurs. If you deactivate the following error evalution, you get a big speed setpoint from the postion controller output.

So set the position deviation monitoring to an reasonable value.

Hello!!!

Thanks For Your Reply 

I Will Check About Following Error Values(Position Deviation) And Revert Back.....