Drive encoder fault 7301
I've got following problem -hope somebody can help- any input would be much appreciated
Machine runs with two motors powered by (ABB ACS800 drives) in master/slave configuration
On master drive we have intermittent encoder error (7301) which is popping up at motors low rpm and sometimes when speed is 0.
However the error is not popping up when drive is set to internal speed calculation
Parameter 33.01-Drive software version:AS7R7322
Parameter 33.02-Application sw version:ASARF012
Following has been done but it didn't resolf the problem:
1.Encoder is new one -replaced few months ago
2.Measured encoder waveform - ok
3.Checked cables,shields etc.. -ok
4.Checked all drive parameters-ok
5.Replaced RTAC pulse encoder interface module at the drive
It could be from the difference between encoder actual speed feedback and internal estimated speed. This could happen especially at lower speed.
The fault 7301 could appear when "the difference between estimated and measured speed is greater than 20% of the motor nominal speed" (par. 50.03)
Not sure how to solve that.
In case the HW and connections are OK, you can try to play with 50.03 (generate only warring) or 50.04 (put some delay for 7301 = max 50 sec)
Source: ACS800 FW manual