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SINUMERIK CNC automation systems: 20002 Fault

hello,
we replaced A1 axis encoder due to encoder error after that installation of new encoder in A1 axis alarm 20002 coming & this is intremental encoder .
already try to change MD vaues as above still 20002 error coming 
when give reference comand start axis & reached to CAM proxy then start in reverse motion it move upto 180 degree as mention in MD parameter 34060 still zero mark not found also we are not able to increase it value due to axis hit with body after exceed 180 degree
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Split from
Alarm 20002 "Zero mark missing"
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