G120: When start running the motor to do the identification it goes to 0

SerchBond

 Same kind of Issue after 3 months running. 

I have checked that bit 10 is at 1 but when I start running the motor to do the identification it goes to 0 by a short amount of time, what is stopping the ID (Then it goes back to 1).

0_Einstein

Perhaps you can show the logic where the control word bits are set for the G120.

Are you using Siemens DriveLibrary and Siemens Telegram 352 block?

Did you set a control word bit 10 monitor that captures (counts) how much it changes from 1 to 0?

If it changes everytime a start command is sent, that's a clue right?

It also could be something is accidentally using the same Output as the control word.

Say for example the control word is QW300.  Maybe there is a QB301 and a QB300 somewhere causing problems, or worse yet, a QD297, QD298, QD299, QD300 hanging around.

Look in the PLC tag table. Display all tags.  Sort tags by address.  See if there is a problem with memory overlap.

SerchBond

Dear all, 

I'm using a S7-1500 PLC and I have a G120 CU240 E-2 PN as variator but when I try to run my motor ID is showing the next error: Master ctrl by PLC missing (F07220).

I have checked that bit 10 is at 1 but when I start running the motor to do the identification it goes to 0 by a short amount of time, what is stopping the ID (Then it goes back to 1).

I have 9 motors with the same configuration, same VSD and same telegram 352 that are working fine.

Do you have some ideas about why this drive is going to fault? Is it a problem from the PLC or from the drive itself? Maybe from the wiring?

Hope you can help me and sorry in advance for my english, is not my first language.

Regards.

 

 Hello again,

as you said I had a problem on PLC tags. I think I was overlapping the Siemens Telegram 352 block tags addresses with other tags I was using at the PLC.

The main problem is that you can't see the Telegram block tags inside the PLC tag table, so I thought it was ok since the beginning.

So when I did the change the motor started working. So again, as you said, I was accidentally using the same Output the control word was using.

Thank you very much for your help!

Regards

------------------------------------------------------------------------------------------
Split from Master ctrl by PLC missing (F07220).