Elimination of PM Plan Lines

Elimination is especially useful for PM actions performed with more than one criteria. By using the elimination function, you can avoid the generation and execution of unnecessary work orders. Elimination is used to eliminate maintenance plan lines in Maintenance Plan tab that are planned to fall due at approximately the same period in time when several PM triggering mechanisms are used, such as a calendar trigger and a condition based trigger. For example, if the PM falls due based on a condition based trigger today, it is not necessary to generate a work order for a calendar that falls due tomorrow. In other words, the percentage denotes at which maintenance yield a maintenance plan line should be eliminated when another PM trigger will fall due first. This field can have a value between 50 and 100. Lower elimination percentage means there is more chance of elimination of the maintenance lines with close planned dates. On the other hand higher elimination value means low chance of elimination of maintenance. Very first two generatable maintenance lines are taken as the base for calculation of elimination value. There is no chance of elimination of the second generatable line as it is taken as one of the base lines. Irrespective of the elimination value of the maintenance line(s), latter maintenance line(s) are eliminated if falling on the same planned date.

Elimination At (%)	Chance of Elimination
Low	High
High	Low

If the calculated elimination value of a line is larger than the Elimination At (%) value specified in the General tab of PM Action, this line is eliminated. Remark is placed on the eliminated lines as Automatically eliminated to identify these lines are not work order generatable anymore.

Example 1:

Part of a maintenance plan with both criteria and calendar as triggers with high elimination value

First two generatable lines are taken as the base for the calculation

Elimination At (%) = 85

Calculation of Elimination value of line 3

Elimination Value = ((Jan 6 - Jan 1)/ (Feb 1- Jan 1)) * 100   =  16.13  < 85

Therefore 3^rd  line is not eliminated.     

Calculation of Elimination value of line 4

Elimination Value = ((Feb 1 - Jan 6)/ (Feb 5 - Jan 6)) * 100   =  86.7  > 85

Therefore 4^th  line is eliminated.                

Calculation of Elimination value of line 5

As line 4 is already eliminated, 2^nd and 3^rd lines are used as base  for the calculation of elimination value of line 5,

Elimination Value = ((Feb 1 - Jan 6)/ (March 1 - Jan 6) )* 100   =  48.1  <  85

Therefore 5^th  line is not eliminated.        

Example 2:

 Part of a maintenance plan with both criteria and calendar as triggers with low elimination value

Elimination At (%) = 60

Calculation of Elimination value of line 4

Elimination Value = (( Jan 24 - Jan 6)/ (Feb 1 - Jan 6)) * 100   =  69.2  > 60

Therefore 4^th  line is eliminated    

 Calculation of Elimination value of line 5

As line 4 is already eliminated, 2^nd and 3^rd lines are used as base  for the calculation of elimination value of line 5,

Elimination Value = (( Jan 24 - Jan 6)/ (Feb 11 - Jan 6)) * 100   =  50  < 60

Therefore 5^th  line is not eliminated.   
   
Maintenance plan can be manually adjusted by modifying existing lines. After doing any of these changes you need to refresh the page in order to get the effect of these changes. New changes in maintenance plan are taking in to account for the elimination process only after refreshing. If the changes are taking place in a page other than the PM Action page, recalculation of the maintenance plan will run as a background job.