The trace data is stored in the built-in RAM of the inverter and deleted when the power is turned OFF or the inverter is reset. The data can be held with any of the following conditions. Separately powering the control power supply using the terminals R1 and S1 or the 24 V external power supply and keeping the control circuit energized. Setting Pr.30 Regenerative function selection to any of "100 to 102, 110, 111, 120, and 121 (no reset when power is supplied to the main circuit)". (However, if the main circuit power supply is turned ON while the protective function of the inverter is being activated, inverter reset is performed.)