mc²56 MKII Technical Manual
V5.10.2/1
36
Chapter 2: Installation
Installing the Nova73
Power
Nova73 HD front view
Nova73 Compact front view
The front of the Nova73 frame offers two slots for the installation of power supply units. On the
Nova73 HD
, the
second PSU is optional. The
is always installed with two supplies.
To operate the Nova73, one PSU is sufficient. When a second PSU is fitted for redundancy, the load is shared
between the two supplies.
The PSUs are hot pluggable. For details on how to change a PSU, see
Warning
All devices
MUST
be connected to the mains using the three-cord power leads supplied with the system.
When running with two mains supplies (PSU 1 and PSU 2), make sure that both circuits lie on the same
ground potential. Otherwise, an internal bridge of two ground wires will lead to a ground loop!
For air conditioning reasons, both PSU slots
MUST
be occupied when the Nova73 is operational:
·
Nova73 HD
: if only one PSU is installed, then please fill the empty slot with a dummy plate (Type
980/21).
·
Nova73 Compact
: leave both PSUs in the frame until a replacement can be fitted.
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