Agilent Technologies 3070 Series, Подготовка площадки

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© Agilent Technologies 1989–2002 Agilent 3070 / 79000 Site Preparation 10-89
Chapter 10: Site Preparation – Power Requirements for Older Systems: Series 3 Power Requirements and Connections (Prior to May 2000)
Sizing The Input Wires And Circuit Breakers
To ensure adequate peak voltage for proper operation of
the system power supply, two minimum requirements
must be met:
■
A system drop must be connected to an ac source
with at least the minimum voltage.
■
The wire used for the drop must be sized to handle
rms loads with less than a 5 percent of nominal
voltage drop between the ac source and the
system.
Table 10-10
on page 10-91 (3-phase) and
Table 10-11
on page 10-92 (single-phase) directs you to another
table listing the correct wire sizes and also to the correct
wiring diagams for each power option.
Using a wire that is too small can cause a larger voltage
drop from the transformer to the 3070 system. This
could mean that the peak voltage into the PDU is not
sufficient for proper operation. If the ac source provides
more than the minimum voltage, then the maximum
voltage loss between the source and the system is not as
critical.
CAUTION
✸
All power configurations using a neutral are
unbalanced, so there will be neutral current.
Therefore, the neutral conductor must be the same
size as the phase conductors.
NOTE
The wire sizes recommended in this chapter are
for the SO cord from the receptacle to the system.
The electrician has the responsibility to size the
wire to the receptacle so that the voltage drop
from the transformer to the Agilent 3070 system
does not exceed 5 percent of the nominal voltage.
The SO power cord conductors between the system
power receptacle and the system should be the wire size
listed in
Table 10-12 through Table 10-17 . This allows
for easy manageability when connecting to the PDU.
The wire sizes from the transformer to the receptacle are
the responsibility of the electrician.
After locating the correct wire size and breaker size in
the following tables, return to
Connecting Power To
The Testhead on page 10-90 for drawings showing how
to connect the power to the PDU.