Glossary · Manufacturing systems
Performance loss
Also known as: Speed loss, Rate loss
German: Leistungsverlust
In OEE analysis, performance loss is the production lost while equipment is running, because it runs slower than its ideal cycle time or has short stops and idling that are not recorded as downtime.
- Manufacturing systems
In one sentence
Performance loss is output lost while equipment runs, due to reduced speed or short stops below the downtime threshold.
Example
The filler runs at 540 instead of 600 bottles per minute after a format change, causing a 10 percent performance loss.
How it applies
- Operation: Performance loss is calculated by comparing actual output with the output possible at ideal cycle time during run time. Short stops (micro-stops) of a few seconds often cause most of it and are rarely noticed without automatic data collection.
- Engineering: Setting the ideal cycle time too low hides performance loss; setting it too high produces figures above 100 percent. Use the design rate or a demonstrated best rate, and document the choice.
- Analysis: Jams at infeeds, material issues and cautious operator speed settings are typical causes.
- Documentation: Document ideal cycle times per product and the threshold that separates short stops from downtime. Troubleshooting guides for recurring micro-stops are among the most useful documents for operators.
Performance loss vs. availability loss
Availability loss counts stops above a defined duration as downtime. Performance loss covers slower running and stops below that threshold. The threshold is a company definition.