Nord Drivesystems NORDAC LINK SK250E-FDS - Reduced Output Current Due to Low Voltage; Reduced Output Current Due to the Heat Sink Temperature; Figure 7: Reduced Output Current Due to Low Voltage

NORDAC LINK (SK 250E-FDS ... SK 280E-FDS) – Users Manual for Frequency Inverters as Field Distributors
192 BU 0250 en-3021
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8.4.4 Reduced output current due to low voltage
The frequency inverters are thermally designed with regard to the rated output currents. For lower low
voltages larger currents cannot be used in order to keep the output power constant. For mains
voltages above 400 V the permissible output current is reduced inversely proportional to the mains
voltage in order to compensate for switching losses.
I / I
N
Mains voltage [V]
Figure 7: Reduced output current due to low 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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