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Performance loss

This is a feature in RS Production OEE


In OEE, performance loss represents the time when the machine is running, but is not running at the optimum speed.

Simple calculation example

Optimum speed = 60 units per hour. This is the expected produced amount when everything runs perfect.

  • Produced amount = 60 units

  • Performance = produced amount / optimum amount

  • Performance = 60 / 60 = 100%

  • Produced amount = 30 units

  • Performance = produced amount / optimum amount

  • Performance = 30 / 60 = 50%


🤓 Note that Optimum speed sometimes is called “design speed” or “name plate speed”.

Based on running time only

Downtime (red time) is not included in the performance calculation. Only the uptime/running time is included.

  • Clock time = 60 minutes

  • Uptime = 40 minutes

  • Optimal cycle time = 60 s → Optimum amount = 60 units /h

  • Optimum amount = 40 units

🤓 Note that “Plannable speed” and “Effective time per unit” includes efficiency losses, and is different from optimum cycle time

Produced amount in different production processes

Of course, produced amount is differently expressed in different factories

Units per hour

Units per minute

Cycle time

Products/hour, Kg/h, Meters/h

Products/min, Kg/min, Meters/min

Seconds/product, Seconds/meter, Seconds/…

3600, 1000, 20

60, 16.67, 0.33

1 s, 3.6s, 180s (3 min)

Products has different Optimum speed

Different products (articles) can have different optimal cycle time

Article/product

Optimal cycle time

Potato chips - 100g bags, Line A

1,8 seconds

2 000 bags per hour

Potato chips - 250g bags, Line A

3,0 seconds

1 200 bags per hour

Also, the same product can have different optimum cycle time in different machines (measure points)

Article/product

Optimal cycle time

Potato chips - 100g bags, Line A

1,8 seconds

2 000 bags per hour

Potato chips - 100g bags, Line B (new)

1,2 seconds

3 000 bags per hour

Example

As mentioned above, downtime (red time) is not included in the performance calculation.

  • Clock time = 1h + 1h = 2h

  • Uptime = 0,75h + 0,5h = 1,25h

100g Pepper chips

225g Pepper chips

Optimal cycle time

1,8 sec per bag

3 sec per bag

Optimum amount

2 000 bags per hour

1 200 bags per hour

  • Optimum amount = (0,75h x 2000) + (0,5h x 1200) = 1500 + 600 = 2 100 bags

  • Produced amount = 500 + 500 = 1 000 bags

  • Performance = produced amount / optimum amount

  • Performance = 1 000 / 2 100 = 47,6%

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