OMD91046 rev D
45
5.2.2 Bypass insulation transformer
It is used when the input line is without neutral, or the galvanic isolation between the
mains and the loads is required.
During normal operation the inverter transformer provides for this task, while during
the bypass condition the mains feeds the load directly. Generally the insulation
transformer is used when the output neutral conductor must be different from the input,
thus discriminating two different grounding systems.
5.2.3 Separate input kit
The following Kit can only be used for UPS units with a three-phase input and output.
It is used when the rectifier input line must be separated from the bypass input line.
For UPS units with a single-phase output, the bypass input and the rectifier input are
already separate.
5.2.4 Voltage adaptation transformers
A voltage adaptation transformer can be connected at the UPS output terminals to
adapt the standard output voltage to the value requested by the loads. It can also be
connected at the input terminals to adapt the actual mains voltage to the values defined
in the technical specification. In case the galvanic isolation is not required an auto-
transformer can be used.
