Service manual

11.
INSTALLATION
Il-A. Maximum Number of Stations
The MS-400A
has a
maximum
output
current
Consult
the
graph
below.
Match
the
num-
capacity
of two amps;
the total
current ber
of speaker stations
in your system
draw
on all
channels
cannot
exceed
this
to
the
number
of headset
stations.
If
output.
The maximum
number
of remote
the
point reached
falls within
the
stations
that one MS-400A will support
shaded section of the
graph, one MS-400A
depends
upon three factors:
will
operate the entire
system with no
1) the current
requirements of
each reduction
in performance.
In situations
remote station
where
a significant current
drain occurs
2) the cable length
1000 feet or farther
from the MS-400A,
3) the cable gauge
an additional
power supply
(or main
station) or
an extra large
gauge cable
If your system
includes headset
stations
may be
necessary
to insure sufficient
only, the
MS-400A can
operate
a maximum
voltage
for full
output
without
clip-
of
100 units.
If your system contains
ping.
Any number
of Clear-Com
main
speaker stations only, the MS-400A can stations and/or power supplies may be
operate up
to 20 units (note: if all connected
in parallel.
remote
stations
are
RM-400A's,
the
maxi-
mum capacity
is
13).
If your
system
In
all
cases,
multi-pair
shielded
mic
contains
a combination of
headset and
cable should be used
to interconnect
all
speaker
stations
(typical
of most
appli-
stations.
The next
Section
describes
cations), you must
determine the maximum
cable requirements
in detail.
system
capacity.
Example:
If
I
hove
0@ 100-40
headset stations,
100- how many speaker
stations
con
my
system
so-
support?
Answer
12
speaker
station
equivalents (S.S.E) (I.E. 8
80-
RM-400A's;
12 KB-lilA's;
70-
\ or a combination
of both.
See text for
calculation
704 dtils.).
HEADSET
STATIONS
&d
50
0
40- - - - - - - -
30-
20-
10_
0
1 2 3 4
5 6 7 8
9 10 11 12 13
14 15 16 17
18 19 20
SPEAKER
STATION EQUIVALENTS (S.S.E.)
A one or two channel station is
1.0 S.S.E..
A four channel station is 1.5
S.S.E.
Figure
1: Maximum
Number
of
Remote
Stations
3