OEE Calculation Algorithm - Running/Down Version

Overview

This document applies to ProFile versions after these.

Frontend: 1.111.1

Backend: 1.115.2

Database: 1.5.001

Platform: 9.4.0-b49

Overall Equipment Effectiveness (OEE) is a metric that summarizes availability, performance, and quality for tools.

Calculation

OEE = Availability * Performance * Quality

Components of the Calculation

Time Domain

OEE is calculated either per-shift or per day.

Per-shift OEE requires that the plant's shifts and schedules are properly configured.

Per-day OEE requires that the plant's daily reset time be configured.

OEE calculations on the molds dashboard can be switched between per-shift and per-day.

OEE calculation on the asset overview page only show per-shift OEE computations.

Availability

Availability is determined by computing the actual run time as a proportion of planned production time.

A = Run Time / Planned Production Time

Run time is equal to the sum of time spent by the asset in Running and Downstates.

Planned production time is computed differently for different types of assets.

Computing Planned Production Time for Tools (Molds and Dies)

Planned production time for tools is computed as the sum of the cycle time for cycles meeting the following criteria:

Cycles less than the sleep threshold configured for the tool, and
Cycles with cycle times exceeding the sleep threshold configured for the tool, only if the downtime has been classified.

Note: planned production time includes time spent actively cycling as well as time spent down, when the downtime is properly classified. Scheduled downtime is excluded from planned production time calculations.

Performance

Performance is calculated as:

P = (Target Cycle Time * # of Cycles) / Run Time

Run time is equal to the sum of time spent by the asset in Running state and the Down state; time spent in scheduled downtime is not considered in the run time determination, and therefore excluded from performance calculations.

Quality

Quality is computed as actual production as a proportion of possible production.

Q = ((Cavitation * # of Cycles) - Reject Count) / (Cavitation * # of Cycles)

Note: cavitation represents the number of parts or units produced in each cycle.

Additional Information

If plant schedules and shifts are not configured, then the shift-based KPIs (including OEE) are reset at the plant reset time. Therefore, the plant and shift KPIs will be identical.

The ProFile system does not compute KPIs such as OEE for machines.

OEE information is included in the molds dashboard, the tool overview page, and the Tool OEE and Production dashboard.

Differences from Previous Behavior

Run time is updated to reflect the new asset states of Running and Down rather than Active and Idle .