Electrical Connection - Siemens S120 Instructions Manual

Electrical connection

3.2.3
Adjusting the fan voltage (-T10)
The power supply for the device fans (1-phase 230 VAC) in the Power Module (-T10) is taken from the line
supply using a transformer. The mounting position of the transformer is shown in the interface descriptions.
The transformers are fitted with primary taps so that they can be fine-tuned to the line voltage. When
delivered, the taps are always set to the highest level. With a low supply voltage, the appropriate transformer
tap must be activated.
The connections at the setting terminals must be connected to "0" and the line voltage.
Figure 15 Setting terminals for the fan transformers
The supply voltage assignments for making the appropriate setting on the fan transformer are indicated in
the following table (factory presetting: 480 V/0 V).
WARNING
Danger of fire due to overheating resulting from insufficient equipment fan voltage
If the terminals are not reconnected to the actual line voltage, overheating and human
danger.
Table 6 Assignment of the existing line voltage for setting at the fan transformer
Line voltage
380 V ±10 %
400 V ±10 %
440 V ±10 %
480 V ±10 %
Siemens S120_EN_rev06-08062017.docx
Tap at the fan transformer (-T10)
380 V
400 V
440 V
480 V
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