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INSTALLATION
(cont.)
4023
Users
(earth)
potential.
Operation
from
other
power
sources
where
both
current-carrying
conductors
are
live
with
respect to
ground
(such
as
phase-to-phase
on
a
multi-phase
system, or
across
the
legs
of
a
1
17-234
V
single-phase
three-wire
system)
is
not
recommended,
as
only
the
line
conductor
has over-current
(fuse)
protection within the
instrument.
The
Terminal
is
provided with
a three-wire
power
cord
with
a three-terminal-polarized
plug
for
connection
to the
power
source.
The
grounding
terminal
of
the plug
is
directly
connected
to
the instrument
frame
as
recom-
mended
by
national
and
international safety codes.
Color
coding
of
cord
conductors
follows the National
Electrical
Code (ANSI
CL-1968) which
specifies Line,
Black; Neutral,
White; Safety Earth
or
Ground, Green
with
a
yellow
strip
(or solid
green).
The 4023
can be operated
from
either a
1
10
or
220
volt
nominal
line
voltage
source
which
has
a
frequency
of
60
or
50
Hz. (For
a
stable display,
the
line
frequency
must
be
60
Hz,
unless
the
4023
has
been ordered
to
operate with
a
50
Hz
voltage source.)
A
fuse
change and
a
jumper
arrange-
ment
for
the
transformer permits the Terminal to be
modified
to
suit
the voltage supply.
The
line
fuse
is
located
in
the bottom-left corner
of
the
back
panel.
Fuse
size
is
indicated
beside the
fuse.
The
transformer
and jumper
arrangements
are
located
inside
the
display unit
in
the
left-rear
corner.
Removing
the display
unit
cover provides
access to
the
jumper
arrangement. This
consists of
removing
2 screws
on
each
side
of the display unit
cover
and 2
screws
at
the top
of
the
rear panel.
The
display unit
cover can then
be removed.
WARNING
Dangerous
voltages exist at several places inside the
display
unit.
Disconnect
the
Terminal
from
the
power
source before changing transformer connections.
(In
the
event
the
power
was
on
when
the
cover
was
removed,
a safety interlock switch
disables the
power
supply. Pulling the
switch
up
allows the
Terminal
to
be operated
with the cover
off.)
Wiring
instructions are
shown
on
the metal protection
cover
directly
above
the transformer wiring connectors.
See
Fig.
2-5.
Wiring
instructions
are
repeated
in
Fig
2-6 for
convenience.
Fuse
size
is
2
A
slow-blow
for
110-volt
operation
and
1.25
A
slow-blow
for
220-volt operation.
L2
.Li
O-
O
o
o
o
o
o
o
LINE
CORD ALWAYS
ATTACHED TO
1
&
4
JUMPER
ARRANGEMENT
VOLTAGE
i
10%
100
115
120
220 200 230 240
TERMINAL
NO
1-8
4-5
1-2
3-4
1-7
4-6
5-7
68
5-8
23
6-7
TWO
JUMPERS
REQUIRED
ONE
JUMPER
REQUIRED
Fig. 2-5.
Location
of
Transformer
wiring connectors.
Fig. 2-6.
Transformer Terminal jumper arrangement.
2-15
®
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