INSTALLATION
2-2
May 2000
Part No. 001-2008-204
2.4 AC POWER
The AC power source to the Johnson VIKING
VX Repeater can be 120V AC or 240V AC. Nothing
need be done to the power supply for 240V AC opera-
tion. However, a 240V AC outlet requires that the
120V AC power plug be replaced. A locking AC
power cord is provided for the supply.
The 120V AC cord is a standard 3-wire grounded
cord used with a standard AC wall outlet. The outlet
must be capable of supplying a maximum of 328W (-
232) or 680W (-234). With the nominal 120V AC
input, the source must supply 3A for each 85W
repeater or 6A for each 175W repeater and should be
protected by a circuit breaker. It is recommended that
all of the repeaters in a rack should not be on the same
breaker in order to provide one operational repeater in
the event a breaker trips. An AC surge protector is
recommended for all equipment.
Each Repeater requires an outlet, so for a 5-chan-
nel system, a minimum of 5 outlets is required. An
additional three outlets should be added for test equip-
ment. The outlets must be within 3 feet of each
Repeater cabinet. Future system expansion should be
considered when electrical work is being planned for
the initial system.
The VIKING VX Repeater power supply can be
equipped with an optional 24V DC back-up in the
event of AC power failure. Since the transmitter will
remain on full power, if desired, the DC power source
must have a current capability of about 15A per 85W
repeater (25A per 175W repeater) or 75A for 5-85W
repeaters (125A for 5-175W repeaters). The multi-
coupler requires another 0.5A for a total system
requirement at 24V DC of 75.5A for 85W repeaters
(125.5A for 175W repeaters).
2.5 BATTERY BACKUP
If the power supply is equipped with battery
backup, screw lugs are provided on the front of the
power supply for battery connections (see Figure 2-1).
A switch is provided for charging the battery or can be
off if a separate battery charger is used. A battery
temperature sensor connection is also provided. The
temperature sensor cable is shown in Figure 2-2. LED
indicators are provided to show Reverse Battery con-
nection, Charger On/Off and Battery Fault.
Figure 2-1 BATTERY BACKUP CONNECTOR
Figure 2-2 TEMPERATURE SENSOR CABLE
2.6 800W POWER SUPPLY
The power supply has four voltage output levels
(see Table 2-1). Each voltage is set to ±1% at +25°C
(+77°F). The output of this supply is capable or run-
ning any 2000 series repeater.
Each output is overload protected such that the
power supply current limits and automatically resets
when the overload is removed (see Table 2-1).
Each output is over voltage protected such that
the power supply shuts down when an over voltage
condition exists, usually when a component in the
supply has failed (see Table 2-2). The power supply
must be manually reset by toggling the Enable Line or
removing AC power for more than 10 seconds.
B-
B+
TEMP
ACTIVE
CHARGER
ON
CHARGER
FAULT
BATTERY
BATTERY
REVERSE
GROUND
EARTH
NEUTRAL
LINE
SWITCH
BATTERY
TEMP
TERMINAL
NEGATIVE
GND
BLK
WHT
