Onan LTC Series - Page 11

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BETwEEN
ENTRANcE
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pANEL
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-
FIG.
Ihe load
selected for operation
during
emergclncy service
rnight
happen
to be
served by only one
of the two
lol
line
wires.
In that
case, half of
a 120/240-volt
gene:ator
would
be
100%
overloaded,
the
other
haif idle.
'firis
can
br,
remedied
bv rewiring
the fuse box::o
the loao
to be
oper-
ated
during ernergencl,is
served
e.qualiy br
each
of
the trvo
fiol
wires.
CONTROL
MOUNTING
The load transfer control is
normalll
supplied
rn a
NEMA
Type
l box for indoor wall
mounting.
It shouid be
protected
frnm
excessive
heat.
mcisture,
dust.
anC
dirt.
Mount the
control
on a
vertical
wall,
switchboard, or
other
permanent
support
where it
will not be
subjected to excessive
vri'ration.
Secure it
with bolts or screws through the holes
provided
in
the
back
of box
(nig.
5).
WIRING
Before rviring
the
controi,
provide
the cornmercial
power
line
with er suitable
switch and
fuses
(or
circuit breakers)
ahead of
the
load
hansfer. All load
circuits shoulci
llso be
7
properly
fused.
Install
and operate
the
plant
from its
own
controls
before
vriring
the load
transfer
control.
Load trans-
fer
control
wiring
e an
he
accomplished
in
two
steps:
f
.
ilire
conhol between
control
and
generator
set.
2.
Wire
load from
line, generator
set, and load,
to
the
con-
trol
If conduit is
used,
run
the control
(low
voltage)
and
load
wires in
separate
conduits.
Contro!
Wiring:
Three
control
wires
connect the load
transfer
control
and
generator
set
{rotmd,
B-f,
and
remote.
For
runs
up
to l0Gfeet,
use
#14
wire;
for longer runs,
use larger
rvire
as
specified in
the
plants
manual.
If
possible,
colorcode
the
wires using
the following
color
code
for
uniformity.
Control
Circuit
Color
Code:
B+..........Green
Ground......White
Remote.....
Red
Connect
the wires
from the
terminal block
in
the
load
transfer
control
to the remote
terminal block in
the
plant
control
box,
9+ to B+,
{round-to-{round,
and
remote-to-
remote
(Fig.
9).
MAIN
POWE
R
SUPPLY
METE
R
I At
ENTRAN
CE
SwtTcH
DTSTRIBUTION
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PANEL
I
FUSES
FUSES
OR
CtRCUlr
,--
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- -,
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BREAKER
(when
used)
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STANDBY
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STANDBY
INSTALLATION
FOF
EMERGENCY
DISTRIBUTIOI{ PAN
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TRANSFER
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FIG"
8