TRS / TRP calculation – Losses on equipment / machine Total Open Time = machine switch-on time(24 h/day, 7 days/week) No load
Time Opened to Work Planned stops
Scheduled Time TRS Machine stops
Available Time Organization Malfunctions
Net OperatingTRP Time
(OEE) Non Quality
Useful Working Time
November 2009
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Causes of losses on equipment / machine 1. No Load
2. Planned Stops Preventive Maintenance Trials for new products or lines modifications
3. Machine Stops Changeover (including quality test for first parts) Breakdowns Micro stoppages and slowdown (including self maintenance)
4. Organization Malfunctions Lunch & legal Breaks 5’ meetings Line QRQC Lack of personnel
5. Non Quality : are called the 7 losses November 2009
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TRS / TRP Definitions TRS measures the degree to which the site production capacities are used Useful working time(1) TRS = Synthetic rate of return = Machine switch-on time(2)
TRP measures the efficiency to which the site uses capacities when they are on a scheduled production Useful working time TRP = Production rate of return = Scheduled Time(3) (1) (2) (3)
Useful working time = number of good parts X unitary cycle time of the installation / machine Machine switch-on time = 24 hours a day; 7 days a week; 52 weeks a year Scheduled time = time during which the production is responsible for the installation / machine
For consolidation (Site – Branch – Group) the global rate is weighted by gross value of the equipments / machines (investment ≥ 200 K€) November 2009
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MTBF Definition M.T.B.F. = Mean Time Between Failures MTBF is the average time that separates 2 breakdowns and/or micro-stoppages
Micro-stoppages Breakdown T1
Breakdown T2
Time
Calculation: MTBF =
Running Time (*) Number of breakdowns + micro-stoppages + 1
(*) Running time does not include the breakdown and micro-stoppage times November 2009
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MTTR Definition M.T.T.R. = Mean Time To Repair MTTR is the average time needed to repair an equipment, each “time to repair” beginning at the time the machine shut down and finishing when the equipment is working at the standard cycle time.
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