Chapter 2 - Mechanical Installation Cooling Cooling of the ACS 300 is based on natural air circulation or by fan, depending on the type. The maximum allowable ambient operating temperature is 50°C when the load current is lower than or equal to the con- tinuous maximum load current I N and switching frequency is lower than or equal to 8 kHz (3 kHz for model ACS 3_1-016- 3). See Figure 2-1 below for power derating curves. The cooling air must be clean and free from corrosive materi- als. If the cooling air contains dust, clean the cooling surfaces of the unit regularly using compressed air and a brush.
ACS 300 AC drives are to be used in a heated, indoor, con- trolled environment that is free of moisture and conductive contaminates such as condensation, carbon dust and the like. P OUT /P N P OUT /P N 1.0 2P7-1 1P1-1, 2P1-1 1.0 1P6-3 - 012-3 016-3 0.8 1P6-1, 4P1-1 0.8 0.6 0.6 0.4 0.4 0.2 0.2 16 2 4 6 8 10 12 14 0 16 2 4 6 8 10 12 14 0 f [kHz] ACS 3_1-1P6-3 to 016-3 (400 V series) ACS 3_1-1P1-1 to 4P1-1 f [kHz] Figure 2-1 Power derating curves by switching frequency. (200 V series) ACS 300 User’s Manual 11