normal
operation.
The
following
table
illustrates
phase
imbalance
as
a
function
of
BPR
configuration.
Number
of
BPRs
per
BPA
Phase
A
Line
Current
Phase
B
Line
Current
Phase
C
Line
Current
1
Power
/
Vline
Power
/
Vline
0
2
0.5
Power
/
Vline
0.866
Power
/
Vline
0.5
Power
/
Vline
3
0.577
Power
/
Vline
0.577
Power
/
Vline
0.577
Power
/
Vline
Note:
Power
is
calculated
from
Vline
is
line-to-line
nominal
input
voltage.
Balancing
Power
Panel
Loads:
The
system
requires
three-phase
power.
Depending
on
the
system
configuration,
the
phase
currents
can
be
fully
balanced
or
unbalanced.
System
configurations
with
three
BPRs
per
BPA
have
balanced
power
panel
loads,
while
configurations
with
only
one
or
two
BPRs
per
BPA
have
unbalanced
loads:
v
With
two
BPRs
per
BPA,
two
of
the
three
phases
will
draw
an
equal
amount
of
current,
and
will
be,
nominally,
57.8%
of
the
current
on
the
third
phase.
v
With
one
BPR
per
BPA,
two
of
three
phases
will
carry
an
equal
amount
of
current,
with
no
current
drawn
on
the
third
phase.
The
following
figure
is
an
example
of
feeding
several
loads
of
this
type
from
two
power
panels
in
a
way
that
balances
the
load
among
the
three
phases.
The
method
illustrated
in
the
preceding
figure
requires
that
the
connection
from
the
three
poles
of
each
breaker
to
the
three
phase
pins
of
a
connector
be
varied.
Some
electricians
may
prefer
to
maintain
a
consistent
wiring
sequence
from
the
breakers
to
the
connectors.
The
following
figure
shows
a
way
to
balance
the
load
without
changing
the
wiring
on
the
output
of
any
breakers.
The
three-pole
breakers
are
alternated
with
single-pole
breakers,
so
that
the
three-pole
breakers
do
not
all
begin
on
Phase
A.
Chapter
1.
Reference
Information
133
Содержание eserver pSeries 690
Страница 1: ...pSeries 690 Service Guide SA38 0589 05 ERserver...
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Страница 3: ...pSeries 690 Service Guide SA38 0589 05 ERserver...
Страница 12: ...x Eserver pSeries 690 Service Guide...
Страница 14: ...xii Eserver pSeries 690 Service Guide...
Страница 228: ...Step 1527 5 Call your next level of support 212 Eserver pSeries 690 Service Guide...
Страница 357: ...Step 1543 15 Call for support This ends the procedure Chapter 3 Maintenance Analysis Procedures 341...
Страница 362: ...Step 1545 15 Call for support This ends the procedure 346 Eserver pSeries 690 Service Guide...
Страница 365: ...Step 1546 15 Call for support This ends the procedure Chapter 3 Maintenance Analysis Procedures 349...
Страница 381: ...Step 154A 14 Turn off the power Chapter 3 Maintenance Analysis Procedures 365...
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Страница 798: ...782 Eserver pSeries 690 Service Guide...
Страница 868: ...Media Subsystem Internal Cables 1021 p690 Cable Installation and Management 1022 852 Eserver pSeries 690 Service Guide...
Страница 910: ...MCM Installation Shorts Test Step 3 See L3 Cache Modules on page 898 894 Eserver pSeries 690 Service Guide...
Страница 923: ...L3 Cache Shorts Test Step 4 Chapter 9 Removal and Replacement Procedures 907...
Страница 924: ...L3 Cache Shorts Test Step 5 908 Eserver pSeries 690 Service Guide...
Страница 926: ...L3 Cache Shorts Test Step 2 910 Eserver pSeries 690 Service Guide...
Страница 928: ...L3 Cache Shorts Test Step 4 912 Eserver pSeries 690 Service Guide...
Страница 929: ...L3 Cache Shorts Test Step 5 Chapter 9 Removal and Replacement Procedures 913...
Страница 1055: ...7040 Model 681 Media Subsystem 1 2 3 4 5 6 7 8 9 10 Chapter 10 Parts Information 1039...
Страница 1057: ...Power and SCSI Cables to the Media Subsystem 1 2 3 5 4 6 Chapter 10 Parts Information 1041...
Страница 1061: ...Power Cabling Chapter 10 Parts Information 1045...
Страница 1090: ...1074 Eserver pSeries 690 Service Guide...
Страница 1094: ...1078 Eserver pSeries 690 Service Guide...
Страница 1109: ...error Handle unexpected modem responses expect 8 r or 7 r or 6 r or 4 r or 3 r delay 2 done Appendix D Modem Configurations 1093...
Страница 1122: ...1106 Eserver pSeries 690 Service Guide...
Страница 1123: ...Appendix E Ground Path The ground path for the pSeries 690 is shown in the following figure 1107...
Страница 1124: ...1108 Eserver pSeries 690 Service Guide...
Страница 1132: ...1116 Eserver pSeries 690 Service Guide...
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Страница 1134: ...Printed in U S A February 2004 SA38 0589 05...