3.
DANGER
In
the
following
step
you
are
going
to
remove
the
power
cables.
These
cables
are
live
if
the
rack
power
distribution
unit
or
uninterruptible
power
supply
(UPS)
unit
is
still
switched
on.
(1)
Remove
the
power
cables
2
from
the
back
of
the
2104
Model
DS4.
See
Figure
10
on
page
xvii.
4.
Perform
the
following
steps
to
return
power
to
the
2104
Model
DS4:
a.
Reinstall
the
power
cables
2
.
b.
Set
the
dc
on/standby
switch
1
of
each
fan-and-power-supply
assembly
to
on.
Note:
You
can
configure
the
motor-start
sequencing
of
the
2104
Model
DS4.
For
more
information,
see
the
sections
about
the
drive
autostart
switch
and
the
delay
motor
start
mode
switch
in
the
Expandable
Storage
Plus
2104
Model
DS4
and
Model
TS4
Service
Guide
.
Removing
power
from
a
2104
Model
TS4
Note:
Unless
you
have
a
particular
reason
to
do
so,
do
not
remove
power
from
the
host
system
or
from
the
2104
Model
TS4
unless
the
instructions
that
you
are
following
tell
you
to.
Perform
the
following
steps
to
remove
the
power
from
a
2104
Model
TS4:
1.
Verify
with
the
customer
that
all
operations
between
the
2104
Model
TS4
and
the
host
system
have
stopped.
2.
At
the
back
of
the
2104
Model
TS4,
set
the
dc
on/standby
switch
1
of
each
fan-and-power-supply
assembly
to
standby.
See
Figure
11
on
page
xix.
Notes:
a.
Some
2104
Model
TS4s
have
a
fan-and-power-supply
assembly
and
a
fan
assembly.
The
fan
assembly
has
no
dc
on/standby
switch.
b.
A
fan-and-power-supply
assembly
might
have
its
CHK
light
on
although
its
dc
on/standby
switch
is
set
to
standby.
xviii
Expandable
Storage
Plus
2104
Model
DS4
and
Model
TS4
Operator’s
Guide
Summary of Contents for Bull Escala 2104 DS4
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