Line-side power components
3.8 Line connection versions
SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7
55
According to b)
S
n1
> S
n2
⇒ S
n1
is decisive
The matching transformer requires a rated power S
n
of 21 kVA for a short-circuit voltage u
k
of 1%.
n2
for the matching transformer can be reduced by reducing u
k
. In the examples listed
above, the power drawn from other loads has
not been taken into account.
Operation of the line connection components via an autotransformer
An autotransformer can be used to adapt the voltage in the range up to 3-ph. 480 VAC +
10%.
Electric shock caused by a high voltage
If the voltage applied is too high for the existing insulation, there is a danger of electric
shock.
• Use an isolating transformer for voltages as of 3-ph. 480 VAC + 10%.
Damage to the device when using an autotransformer
If an autotransformer is used, safe electrical separation is no longer possible for a line
voltage higher than 480 V +10%. This can lead to damage or a fault in the device.
• In this particular case, use an isolating transformer
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