*3.2.1. Measure the power factor at different loads*

The power factor is measured while the machine is running. The machine has two well-defined modes of operation – one when the metal sheets are actually shaped and one when the hy‐ draulic motors are running without any load, i.e., idling.


**Table 4.** Measured power and power factor for a hydraulic press.

### *3.2.2. Log the current*

The current is logged for about a week, to cover working days as well as the weekend. The original current logging data is presented in a graph (Figure 9).

**Figure 9.** The current used by a hydraulic press during one week.
