This topic details the Availability metric of the OEE (Overall Equipment Effectiveness) formula: OEE =Availability x Performance x Quality
Also see:
The Availability submetric of the OEE metric is the percentage of scheduled operating time that the process is available for operation.
Planned Production Time (PPT) is the amount of time that any piece of equipment is scheduled for operation, which is usually measured in minutes or hours. Planned shutdown time is not included in this calculation.
Example: If a machine is scheduled to run between 10 a.m. and 5 p.m. on Monday, the PPT is 7 hours—or 420 minutes. If the machine is scheduled to be shut down while the employee is at lunch, that time is not included in PPT.
Downtime, the time the operation is not running, is usually measured in minutes. Consider establishing a policy for a threshold for what constitutes an event that should be tracked. This might include any operation in which the equipment is non-operational.
Operating Time is the planned production time less any downtime. Time spent on machine setup and changeover, equipment malfunction, or material shortages, for example, are included in downtime.
|
Total time in shift- 8.0 hours |
480 minutes |
|
Lunch break: (operation is shut down during this period) |
(30 minutes) |
|
Machine setup |
(95 minutes) |
|
Other downtime |
(17 minutes) |
Planned Production Time: 450 minutes (480 shift minutes less 30 minutes for scheduled lunch break)
Actual Operating Time: 338 minutes (450 minutes less 95 minutes for machine setup and 17 minutes other downtime)
Availability = Actual Operating Time (338) /Planned Production Time (450)
Availability = 0.751 (multiply by 100 to express it as a percent = 75.1% )