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70 C120-H007-05EN
CHAPTER 6 Power Supply Facilities
(2) Systems that can tolerate a service disruption
If a server system can tolerate a service disruption caused by power interruption or
voltage variation, install a transformer dedicated to that system, isolated from the
secondary terminals if the system runs at 200 V or grounded to a neutral phase wire if
it runs at 400 V.
a) Transformers dedicated to 200 V server systems
Table 6.3 contains descriptions of the types of transformers dedicated to 200 V
server systems and their schematic views.
Table 6.3 Transformers for 200 V server systems
Case
Transformer dedicated
to a server system
Schematic view
A dedicated high-to-low-voltage
transformer can be installed.
Install a contact
prevention transformer
that has an output voltage
of 200 V and is dedicated
to the server system. The
secondary terminal of the
transformer shall be
isolated.
High-voltage line
High-to-low-voltage
transformer that is shared with
other power supplies.
Install a separate
transformer that has an
output voltage of 200 V
and is dedicated to the
server system near the
distribution panel. The
secondary terminal of the
transformer shall be
isolated.
High-voltage line