Derating Curves - Hitachi L300P Specifications

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Derating Curves

The maximum available inverter current output is limited by the carrier frequency and ambient

temperature. The carrier frequency is the inverter's internal power switching frequency, settable

from 0.5 kHz to 12 kHz, or 0.5 kHz to 8 kHz for higher horsepower models. Choosing a higher

carrier frequency tends to decrease audible noise, but it also increases the internal heating of the

inverter, thus decreasing (derating) the maximum current output capability. Ambient tempera-

ture is the temperature just outside the inverter housing—such as inside the control cabinet

where the inverter is mounted. A higher ambient temperature decreases (derates) the inverter's

maximum current output capacity.

Use the following derating curves to help determine the optimal carrier frequency setting for

your inverter, and to find the output current derating. Be sure to use the proper curve for your

particular L300P inverter model number.

Legend:

L300P 1.5 to 22 kW 200V class

100%

95%

90%

85%

80%

75%

70%

65%

60%

55%

0.5

Carrier Frequency (kHz)

L300P Inverter

Output current at 40 °C ambient

Output current at 50 °C ambient

015L, 022L,

037L, 055L,

075L, 110L,

150L, 185L

220L

185L

220L

150L

110L

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