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Power Distribution
© cognitas. Gesellschft für Technik-Dokumentation mbH 2011 Pfad: O:\FTS\PRIMERGY-HW\Rack\PCR-M1-Rack\Manuals\User Manual\02_work\pcr-m1-rack-um-en\pcrm1-rack-um-en.k07
7.5 Power Supply via UPS
If uninterruptible power supply (UPS) units are involved in supplying energy to
the rack and its components, the connection conditions described in the
relevant manuals for the integrated rack components should be complied with
in all cases. There are many possible combinations:
● The rack is supplied completely via the UPS:
In this case the UPS should be connected directly to the mains. In the rack
the rack components are connected directly or optionally via a socket strip
to the UPS.
● The rack is partly supplied via a UPS:
This gives a choice of connecting the UPS via the socket strip in the rack or
directly to the power supply network. This process also applies if a number
of UPSs are used in the rack.
● High-power UPSs above 3000 VA:
UPSs above 3000 VA need their own mains connection because of the large
amount of current that they draw. Both fixed connections and connections
using IEC 309-complaint connectors can be used here. The technical
requirements can be taken from EN60950 and from the specifications of the
local utility company.
Online UPSs and line-interactive UPSs are available in different performance
classes. Different UPS types are used preferentially by the various server lines
for the PRIMECENTER M1 19-inch rack. Please refer to the configuration
information for the individual severs.
The power supply can be configured freely depending on the UPSs used. The
input power connector of the respective UPS can be connected either directly
to the mains or to the protective contact socket of the main socket strip in the
rack by using the connection cable supplied with the respective UPS. The rack
components or additional socket strips should be connected to the power
outlets of the respective UPS.
I Note that the increased leakage currents >3.5mA can also flow over UPS
connection cables. The connection cables therefore have to be assigned
uniquely to the device and the strain on the UPS relieved, either using
appropriate strain relief facilities or by routing with suitable cabling, which
requires the assistance of tools to change the cabling.