NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
258
BU 0200 en-US-4920
8.4.4 Reduced output current due to line voltage
The devices are designed with thermal characteristics according to the nominal output currents.
Accordingly, for lower line voltages, higher currents cannot be taken off in order to maintain the stated
power constant. For line voltages above 400 V, there is a reduction of the permissible continuous
output current, which is inversely proportional to the line voltage, in order to compensate for the
increased switching losses.
I / I
N
Line voltage [V]
Figure 35: Output current due to line 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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