FAX 5/10/20/30/40KW
October 28, 2013
1
‐
21
888
‐
2720
‐
001
WARNING:
Disconnect
primary
power
prior
to
servicing.
Copyright
©2013,
Harris
Broadcast
1.12 Grounding Requirements
Two
separate
ground
connections
are
required
for
the
Flexiva
FAX
series
transmitter:
an
AC
safety
ground
and
an
RF
earth
ground
.
The
AC
safety
ground
prevents
an
electrocution
hazard
should
a
dangerous
potential
from
inside
the
unit
accidentally
contact
an
exposed
metal
surface.
This
is
done
by
ensuring
all
metal
surfaces
have
an
uninterrupted
connection
back
to
the
physical
earth
(PE)
terminal
at
the
AC
mains
service
entrance.
A
physical
earth
(PE)
connection
is
typically
tied
to
the
return
current
terminal
either
indoors
at
the
main
distribution
panel
or
outside
“at
the
pole”
(as
dictated
by
local
codes),
thus
allowing
any
fault
current
to
safely
return
to
the
power
source.
The
AC
safety
ground
connection
is
made
automatically
for
the
exciter
and
other
Harris
Broadcast
auxiliary
equipment
via
the
green/yellow
wire
on
the
third
prong
of
the
AC
input
cord.
When
the
exciter
and
any
auxiliary
equipment
are
connected
directly
to
a
user
‐
supplied
outlet
box
or
distribution
panel,
the
green
‐
yellow
wire
from
the
AC
input
cord(s)
must
terminate
at
the
PE
terminal
at
the
AC
mains
source.
In
the
case
of
a
Harris
Broadcast
‐
supplied
AC
distribution
chassis,
the
green/yellow
earth
wire
from
the
incoming
AC
mains
service
terminates
at
the
PE
terminal
of
the
AC
distribution
chassis
(ground
symbol
inside
circle).
The
individual
subassemblies
making
up
the
transmitter
connect
via
the
green/yellow
wire
of
their
mains
cords
to
the
same
PE
terminal
on
the
AC
distribution
chassis.
When
present,
a
rack
buss
‐
bar
will
also
connect
to
the
PE
terminal.
Individual
panels
making
up
the
rack
cabinet
without
a
solid,
permanent
connection
back
to
the
PE
terminal
that
might
be
exposed
to
unsafe
voltages
(e.g.
doors
on
hinges)
will
connect
to
the
PE
terminal
via
a
wire
jumper
connection
to
the
buss
‐
bar.
The
RF
earth
ground
prevents
damage
to
the
equipment
during
lightning
‐
induced
transients
and
reduces
RF
interference
to
low
level
circuits
in
general.
An
RF
ground
strap
attachment
point
is
located
at
the
rear
of
the
FAX
transmitter
and
exciter
chassis.
This
connection
is
suitable
for
use
in
a
single
point
grounding
system,
with
the
ground
strap
attached
to
the
equipment
rack
and
the
rack,
in
turn,
to
a
common
grounding
plate.
A
minimum
2"
copper
strap
is
recommended.
Note
Observe this important distinction: The AC safety ground ensures that energy originating at the AC mains
source is always safely returned to the AC mains source (i.e. prevents electrocution), whereas the RF earth
ground ensures that energy “originating in the earth,” such as lightning, safely returns to the earth. Con-
fusion may arise in some cases because the AC safety and RF earth ground circuits may share the same
conductor or connection point(s) in some situations. To prevent confusion, some sources refer to the AC
safety ground as “bonding” and the RF earth ground as “earthing.”
1.13 AC Requirements
1.13.1
Surge Suppression Devices
Harris
Broadcast
strongly
recommends
the
use
of
surge
protection
devices
on
the
incoming
AC
mains
lines.
These
devices
protect
against
damages
due
to
transients
arising
from
both
natural
and
man
‐
made
sources.
(e.g.
lightning
and
inductive
load
switching).
Clear
preference
is
to
be
given
to
“series”
type
surge
protection
devices
‐‐
featuring
protection
by
both
a
series
inductance
/
shunt
capacitor
filter
and
shunt
threshold
device
‐‐
over
simple
shunt
‐
only
clamping
devices.
The
surge
protector
must
be
sized
to
handle
the
full
amperage
of
the
load
it
is
protecting
(plus
a
nominal
safety
margin)
and
be
connected
to
the
building
ground
system
by
short,
direct
connections.
In
the
case
where
the
shunt
protection
elements
are
protected
by
a
fuse,
it
is
necessary
to
periodically
check
the
integrity
of
the
fuse
to
ensure
continued
transient
protection.
Consult
the
manufacturer
of
these
products
for
best
device
to
be
used
in
each
installation.
1.13.2
Voltage Regulation
If
voltage
variations
in
excess
of
the
transmitter
specified
range
are
anticipated,
the
transmitter
power
input
must
be
equipped
with
an
AVR
(automatic
voltage
regulators)
(optional
equipment)
capable
of
correcting
the
mains
voltage.
There
are
several
factors
that
need
to
be
taken
into
consideration
when
selecting
the
proper
AVR.
All
these
factors
should
be
discussed
with
the
manufacturer
prior
to
purchasing
a
unit.
Summary of Contents for Flexiva FAX 10KW
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