Specifications

X723-300151 8-5 Issue 2
Under typical conditions, e.g. ambient temperature less than 25
o
C, and
with the powered equipment half loaded with cards, fans will not be
required.
Advice on any particular installation can be gained by contacting your
supplier. The initial fitting of a fan requires the unit to be powered down.
It is recommended that a 1U (1.75") space is left above the power unit to
aid ventilation.
The power unit shelf may be mounted either above or below the powered
equipment.
All connections are made via the rear of the unit. At least 3 inches (7.5cm)
clearance is required for the fitting of connectors and cable routing.
8.4 Power Wiring
Before making any power connections ensure the PSUs are removed from
the shelf or isolated with the front panel switches off.
All power connections are made to the rear power input panels. The
connection method depends upon the type of PSU fitted.
48V DC Power Input Panel
Connection is by means of a three way screw terminal block, using M3.5
(4BA) ring terminals.
Input Voltage: -38 to -60 volts DC
Current: 6.6 amps max.
Fuse Type: 8 amp quick blow (F), 20 x 5mm
The fuse is mounted in the PSU front panel.
Note that the positive pole of the input supply must be connected to earth,
usually, at the supply source. An earth connection must also be made to
the earth terminal.
AC Power Input Panel
AC connection is by means of an IEC320 type connector. A connector
fitted with a 2 metre mains lead is supplied. The AC PSUs may be
operated at 115V or 240V (nominal) selected by a switch mounted on the
PSU front panel.