Should preventative maintenance Down Time be allowed to penalize an OEE calculation?
If the preventative maintenance happens during Planned Production Time (rather than during Planned Shut Down) then it is interfering with production and should be counted. This does not mean that you should not do preventative maintenance at that time; it only means that over time, OEE will tell you whether this maintenance results in less overall Down Time, because of fewer “surprises”, or more Down Time, because of the lost productivity while maintenance is done. This is an example of how OEE can give you solid answers to complex questions by attaching them to simple measurements.
If the preventative maintenance happens during Planned Production Time (rather than during Planned Shut Down) then it is interfering with production and should be counted. This does not mean that you should not do preventative maintenance at that time; it only means that over time, OEE will tell you whether this maintenance results in less overall Down Time, because of fewer “surprises”, or more Down Time, because of the lost productivity while maintenance is done. This is an example of how OEE can give you solid answers to complex questions by attaching them to simple measurements.