Reduced Output Current Due To Mains Voltage; Reduced Output Current Due To The Heat Sink Temperature - nord NORDAC SK 200E Manual

8.3.4

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 400v 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.
I / I
N
1.2
1.2
1.1
1
0.9
k Une tz Unetz ( )
0.8
0.7
0.6
0.5
0.4
0.4
8.3.5

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.
BU 0200 GB
320 340 360
320
Subject to technical alterations
380 400 420
Une tz
8 Additional Information
440 460 480
Mains voltage [V] 480
173