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Monday, August 25, 2014

SAP Preventive Maintenance Flow


SAP Preventive Maintenance Flow

We have moved this resource to its Parent Website, Please check below link for SAP Preventive Maintenance Flow.


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Monday, August 4, 2014

MTBR,MTBF and MTTR Concept and Calculation





MTBF and MTTR Concept and Calculation

By using the breakdown statistics you can analyze the causes of a particular breakdown more closely. The focus in this case is on the distribution of duration of the various breakdowns or repairs, and on how these were caused. The aim of these analyses is to find out the cause behind a short or long breakdown period, or the period between two consecutive breakdowns. An indicator in the first screen of the notification indicates that a malfunction report or a maintenance request contains a machine breakdown.
Key Figures for Machine Breakdowns
We distinguish between the following:
  • Number of machine breakdowns reported
  • Number of actual machine breakdowns
The reported breakdowns are important from a business point of view, whereas the actual breakdowns are of interest from a technical viewpoint.
There are three cases which are important for the breakdown analysis. These are represented in the following diagram, which displays two reported breakdowns in each case.



Key Figures for Downtime
The key figures for downtime comprise the following figures:
  • Downtime entered/Time To Repair
  • Mean Time To Repair
The average duration of a machine breakdown, MTTR (Mean Time To Repair), is calculated from the individual history of a piece of equipment. This gives us the following formula:

The key figure MTTR is calculated in hours.




First breakdown 10 hours
Second breakdown 05 hours
Number of breakdowns 02
MTTR = 10 + 5 / 2 = 7.5 hours

To calculate the key figure Mean Time To Repair, in the breakdown analysis (information structure S070) the effective breakdowns and the number of effective breakdowns are taken into account. In all other analyses (and the underlying information structures) the noted breakdown duration and the number of noted breakdowns are taken into account.
Key Figures for Duration Between Machine Breakdowns
The key figures for the duration between machine breakdowns comprise the following ratios:
  • Time Between Repair
  • Average Time Between Repair
The average duration between two machine breakdowns, MTBR for short (Average Time between Repair), is calculated from the individual history of the equipment. This gives the following formula:



The key figure MTBR is calculated in hours.
The following example shows how the MTBR is calculated:





Acquisition date of pump A 01/01/94
First breakdown 01/10/94
Downtime 10 hours
Second breakdown 01/20/94
Downtime 5 hours
Number of breakdowns 2
MTBR = (19 * 24 - 10) / 2 or X + Y (St) / 2
= (456 - 10) / 2 or (216 + 240 - 10) / 2
= 223 hours

When calculating the key figure Mean Time between Repair, only the start-up date can be taken into account if the indicator Start-up was set in the master data for equipment or functional locations. If the indicator was not set then the end date of the first malfunction message will be taken into account. In this case, the first malfunction message will not be used when calculating the key figure MTBR (refer to the following illustration).






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Friday, April 25, 2014

Monday, February 17, 2014

SAP Degree of Processing on Gantt Chart

SAP PS Degree of Processing on Gantt Chart

While creating the activities we have to give the normal duration, Work center and calculation key as 2 must be selected as shown below:



The project builder view will be as below



Gantt chart before confirmation:

     To view the % of processing in the chart, click on
button and in planning board select Date bar text tab and maintain fields as below.


Save the settings.
Confirm Activities as per your requirement
The following screen will appear where we have to fill processing percentage of work or actual hours of work.


Your Gantt Chart will represent the value as shown below:







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Thursday, May 2, 2013

Indent or Purchase Order Release Retrigger SPRO Settings

PR/PO Release Retrigger
Some time we require to add/delete certain materials into PR/PO after Release.
Here question arise whether we should permit user to do so or not. Many Organization allow
addition /deletion in released doc but they ensure that PR/PO should again go for release again.
This is called PR/PO Release Retrigger.

Above resource moved to blog's Parent Site so please refer below link for complete process.

http://erpbizz.com/MM/Release%20Strategy.html

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