Hitachi L100 Derating Curves

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L100 Inverter

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 16 kHz. 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 temperature 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 L100 inverter model number.

Legend:		Standard ratings at 40°C
		Ratings at 50°C max. with top cover removed
		Ratings at 55°C max. with top cover removed
L100–002NFE/NFU
	100%
	95%
% of rated	90%
	85%
output current
	80%
	75%		kHz
	70%

	0.5	2	4	6	8	10	12	14	16
L100–004NFE/NFU				Carrier frequency
	100%
	95%
% of rated	90%
	85%
output current
	80%
	75%									kHz
	70%
	0.5	2	4	6	8	10	12	14	16
				Carrier frequency

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