7
vacon • 43
SIZING OF THE SYSTEM AND PRODUCT
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Figure 46. Current capability of a DC/DC converter
NOTE!
I
NOM
= I
1
~1.2*I
2
An example curve in above shows the combined current limit line for the DC/DC converter
depending on the ratio of storage voltage and converter DC-link voltage. The nominal current of a
DC/DC converter is defined as I 1 in the DC/DC converter rating plate which is approximately
1.2*I 2 depending on the frame size. The value of I
MAX
and I
1min
vary depending on voltage class and
switching frequency of the DC/DC converter. These values are higher when the switching frequency
is decreased to 4 kHz and higher also for the NX5 voltage class units. In addition, the 1min limit
applies only to frame sizes FI9-FI14.
NOTE!
The nominal current of the DC/DC converter is not the same as the inverter current rating.
You may roughly calculate the DC/DC converter current rating by multiplying the inverter current
rating by 1.2. To have an overview, see the following table where the DC/DC converter current
ratings for NX6 are given.
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
0 0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Iout
Iout 1min
U
BATTERY
/U
DC
I
OUT
/ I
NOM
Summary of Contents for NX6
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