NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
260 BU 0200 en-3118
8.4.4 Reduced output current due to mains voltage
The devices are designed with thermal characteristics according to the nominal output currents.
Accordingly, for lower mains voltages, higher currents cannot be taken off in order to maintain the
stated power constant. For mains voltages above 400 V there is a reduction of the permissible
continuous output current, which is inversely proportional to the mains voltage, in order to compensate
for the increased switching losses.
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Figure 35: Output current due to mains voltage
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8.4.5 Reduced output current due to the heat sink temperature
The temperature of the heat sink in included in the calculation of the reduction of output current, so
that at low heat sink temperatures, a higher load capacity can be permitted, especially for higher pulse
frequencies. At high heat sink temperatures, the reduction is increased correspondingly. The ambient
temperature and the ventilation conditions for the device can therefore be optimally exploited.
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