Skip to Content
0

How to stop unwanted triggering of work orders for performance based maintenance plan?

Apr 12 at 07:37 AM

109

avatar image

Dear fellows,

I have scheduled a performance based maintenance plan based on running hours. I updated the measuring document with the current running hours of each equipment. The trouble is maintenance orders are getting generated even without the counter hitting the set point frequencies/running hours.

For eg. One of my equipment is at 2 running hours. The maintenance task list does not have a maintenance scheduled at 2H. However, the system is triggering work orders.

I read somewhere that this is due to annual estimate of the running hours and incorrect setting of dead line monitoring.

Can some one explain how to rectify this fault and properly set the dead line monitoring?

10 |10000 characters needed characters left characters exceeded
* Please Login or Register to Answer, Follow or Comment.

5 Answers

Suleyman Bulus Apr 12 at 02:42 PM
0

Hello James,

Annual estimate functions as below,

Say for example you have a counter with annual estimate 360. That means on average this counter runs 1 unit every day. (360/360).You create a perf. based. maint. plan to this counter and set a cycle of 2 unit. Then you enter a measuring document and schedule the maint. plan. 2 days later, if you do not create any measuring document, even with 0 difference, when you schedule the plan system will generate a call since you define your annual estimate as 360. If you create measuring document with 0 difference then no call will be generated. This is the standard behavior and I am sure that you can find a lot of blogs, posts about it. For example check this one: https://blogs.sap.com/2014/06/17/behavior-of-performance-based-plan-in-sap-plant-maintenance/

You have two options to discard the functionality

1- Make sure that you create measuring document every once in a while, (every day or every week) even there is no actual difference in reading.

2- Define an unrealistic annual estimate value so that no geneartion is possible due to low annual estimate. Like 10 units per year.

Share
10 |10000 characters needed characters left characters exceeded
James Tomy Abraham Apr 19 at 07:56 AM
0

Hi Suleyman,

Thanks for your detailed answer. Appreciate your time and expertise so much!!

I am following a strategy plan (IP40) for perf. based maint. plan and not a single cycle plan. Hence, I have a task list with frequencies set at different running hours based on the manual. Do you have any idea how the dead line monitoring works?

My understanding of your answer is:

If I change my maintenance plan now (IP02) and alter my annual estimate from 3000RH to an unrealistic value like 10 , then the issue won't repeat.

If I update the measuring document every week, then the issue will be resolved but this is tough work and can be forgotten easily. Can this be automated?

Show 1 Share
10 |10000 characters needed characters left characters exceeded

Hi James,

In Deadline montoring (IP30) is the Interval for Call Objects are maintained ? If you have maintained any specific value, system will call the orders within that period.

For Performance Based Plans, there is no issues on when you are entering the documents, but system will trigger the order when the particular counter is reached.

Annual estimate is a trigger to understand when the call object is called for the scheduling period. For a year it will be 365*24 = 8760 hrs. For a 3000RH package, every 125 days, you will get a order. If your Annual estimate is less than or more, the dates will be changed accordingly

In your case, check the Maintenance Scheduling, check the next counters it has planned to call the order. If this has strategy, you need to check whether the correct package is assigned and it is picked.

You can share screenshots of Plan / scheduling parameters / scheduling overview / Packages assigned in plan etc, so we can also check and update you.

Regards

Terence

0
James Tomy Abraham Apr 24 at 10:44 AM
0

Dear Maria,

I have all the pictures you need. For some strange reason, I am not able to complete the upload function on this forum. Can I send this to your email address instead?

Show 10 Share
10 |10000 characters needed characters left characters exceeded

Hi James,

If you cant upload pic, answer the things i have asked.

Regards

Terence

0

Hi Maria,

Please see the pictures here.

0

Hi Maria,

IP02 settings.


ip02.png (58.4 kB)
0

Hi Maria,

IP10 settings.


0
James Tomy Abraham

Hi,

Is your question related to the calls which was called on 19.11.2017 ?

Why so many orders called for that specific date ?

This can be due to your Task List validity date, since during IP10 scheduling, you might have entered the start of cycle date prior. (This can be a possibility)

Coming to Annual Estimate, It should be realistic, like say the expectation of hours the equipment will run in a year. Say, 365*24 = 8760 Max hours per year. If your annual estimate is less than this say 3000 Hrs. 3000/12 = 250 hrs per months which will be appro 8 hrs per day.

Including above taking Call Horizon and Scheduling period into consideration, your plan and call dates are planned in IP10.

When ever the counter reaches the cycle, system will create the order upon executing IP10 or IP30.

Kindly let us know if you have any specific queries

Regards

Terence

0

Hi Terence,

Please check the attachments for another equipment , HP-21. I sent you the earlier details as a reference only. The earlier equipment orders were getting generated together on 19.11.2017 since we set initial counter reading as 0 and when the measuring document was created with the 3936 hours, system triggered all orders as per our strategy, which is fine for me. However, if you check the details I sent for HP-21, you can see that counter reading is only 202 hours but system is keeping on generating orders as per annual estimate. It is calculating 8.2 hours per day and in one week it estimates 50 hours and hence executes S1- which is 50H frequency maintenance task. I want to get around this problem. Mr. Suleyman has advised me to change the annual estimate to stop triggering unwanted orders. You can also offer your suggestions.

Thank you so much for your efforts, Terence. You guys are a huge help to me.

0
James Tomy Abraham

Hi James,

I checked your screenshot, some thing strange on maintaining the measurement documents.

Is it reverse counter ? Completed Counter reading is 250 - 48 = 202 ?

With respect to your scheduling parameters, If the First call is generated on 12.07.2018, next call will be 50Hr (50/8=6.25) which is 6 days from first call, it is 18.07.2018.

Annual estimate is used to calculate your plan dates and call dates, this should be realistic else you will not understand how often you need to do maintenance etc. In your case, i have a doubt on counter measurement documents.

Regards

Terence

0
0
0
0
James Tomy Abraham Jun 10 at 06:41 AM
0

Hi Maria,

Task list



task-list.png (69.6 kB)
Share
10 |10000 characters needed characters left characters exceeded
Suleyman Bulus Jun 11 at 01:00 PM
0

Hi again James,

Actually I've lost the track of questions and answers but here I have a suggestion for you. (I do not know what was Maria going to explain you with the screenshots.)

If you can't create measurement document every once in a while you have 2 options:

  • Define realistic annual estimate Develop a program that creates measurement document with 0 change for all measuring points. Create a job for it.
  • Define unrealistic annual estimate. Then your next calls will be calculated accordingly and you won't have unwanted work orders

For those 2 options you do not have to change anything related to IP30. Your variant seems OK.

Now, with respect to option you are going to choose, your IP24 will be affected.

Assuming you have just created following maintenance plan. Say for example you have packages of 500 and 1000 hours. Your annual estimate is realistic, let's say on average you do your 500 package every 3 months. Then, your annual estimate would be 2000. Your scheduling period in the maintenance plan is let's say 1 year. Today, you have a maintenance with the package of 500 hours. You have completed it today. Now, if you run IP10 or IP30 and execute IP24 for that maintenance plan, you will have 4 calls for the future:

1st one is scheduled for 11.09.2018 (500H-1000H)

2nd one is scheduled for 11.12.2018 (500H)

3rd one is scheduled for 11.03.2019 (500H-1000H)

4th one is scheduled for 11.06.2019 (500H)

Now that makes 1 year of scheduling period.

Let's take the 2nd option with the same parameters, but, this time your unrealistic annual estimate would be 500. You have your order due today, and you have completed it. Once you run IP10 and IP24, you will have only one call scheduled for the future:

Only one call is scheduled for 11.06.2019 (500H-1000H)

This is the main difference you are going to encounter. So choose according to your business requirement.

Show 2 Share
10 |10000 characters needed characters left characters exceeded

Hi Suleyman,

Thanks for responding and for taking time to write to me. Much appreciated!

I can't really work with a realistic annual estimate. So I opt to go with an unrealistic annual estimate. The question is if my next call date is 11.06.2019 i.e one year from now , but the equipment completed 500H on say, 23.08.2018, if I create a new measuring document with the 500H, would a maintenance order be created in the system?

Please also let me know whether I can set 2H as my annual estimate.

0
James Tomy Abraham

Yes it will be created. Regardless of the next planned call date, since you created a measurement document that fulfills the package, there will be an order. Once it is created and completed, next planned call date will be updated again according to your annual estimate.

Yes you can set 2H as your annual estimate.

0