# 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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