Clear-Com MS-704 - Manual (Page 21)

M S - 7 0 4 / R M - 7 0 4 F O U R - C H A N N E L M A I N / R E M O T E S T A T I O N S
2 - 5
Figure 2-6: J16 Six-Pin Jumper
5. Continue placing pins until all desired channels are connected.
6. Replace the cover of the RM-704.
Figure 2-7: Stations Powered by Multiple Channels
The illustration above shows the power wiring of a system powered by a single
MS-704. An RM-704 is connected to all four power lines through the intercom
line connections. However, the blocking diodes in the RM-704 prevent a short
circuit on one line affecting the others. Other single channel remote stations are
also connected to individual channels.
POWER DISTRIBUTION AND SHORT CIRCUIT PROTECTION
Depending upon how many shorts or overloads a channel has experienced
recently, the MS-704 will attempt to turn power on again within 0.5 to 20
seconds of automatically cutting off power to an overloaded channel. This allows
momentary short or overload conditions to clear automatically. If the MS-704
cuts power off to one or both channels, it will indicate which channel is affected
by blinking the red short light(s) corresponding to these channel(s). This light
1
2
3
4
5
6
Placing jumper plug over pins 1 and 2 connects channels A and B
Placing jumper plug over pins 3 and 4 connects channels B and C
Placing jumper plug over pins 5 and 6 connects channels C and D
J16
FAIL SAFE POWER DISTRIBUTION SCHEME
WITH MULTI-CHANNEL REMOTE STATIONS
+30 Volts for each
Intercom Line
Ch A Power
R 2 Amp
Power
Supply
R
Ch B Power
Ch C Power
Ch D Power
TO
SYSTEM
Other
Remote
Stations
Belt
Pack
R
R
Station
Electronics
MS-704 Main Station
RM-704 Remote
Station