The average setup time is calculated from the fixed and variable duration that you have maintained for the setup activity in PPM or the PDS according to the following formula:

Average Setup Time = Fixed Duration + Variable Duration x Order Quantity/Output Quantity

If you have not maintained a fixed or variable duration for the setup activity, then the system does not take the sequence-dependent setup activity into account during the bucket-oriented capacity check.

The average setup time also consumes the bucket capacity when you carry out detailed scheduling. Therefore, the capacity utilization and the available capacity can be different for the time-continuous capacity and the bucket capacity.

Alternatively, the system can take the capacity requirements of sequence-dependent setup activities into account with a bucket capacity reduction for the bucket-oriented capacity check when you specify the resource in the Bucket Factor field. The percentage of the capacity requirements of the sequence-dependent setup activities of the total capacity requirements is estimated using the historical value. The available bucket capacity of the resource is then reduced by this percentage.

I f the sequence-dependent setup activity is taken into account with the bucket capacity reduction during planning, the PP/DS bucket overload alert is frequently triggered as the available PP/DS bucket capacity is smaller than the available capacity of the time-continuous capacity. If the capacity utilization of the time-continuous capacity approaches 100%, the PP/DS bucket capacity is overloaded. Therefore you should define a threshold value in the PP/DS Alert Profile for the PP/DS bucket overload alert , which takes into account the bucket capacity reduction .