Harris Legacy 99-1300-0, Operation & Technical Manual

Page: 16 / 98

Revision B • 1/03
H A R R I S C O R P O R A T I O N
2-4
2 Installation
GROUNDING AND SHIELDING
The broadcast facility’s technical ground can
be connected to the mainframe chassis using the
threaded insert on the rear of the console (shown
in the Power Connections drawing on this page).
Use a 10-32 screw and crimp lug to terminate the
facility’s technical ground wire.
Connect the cable shields at both the console
and the peripheral end when all system compo-
nents share a common ground potential and are
using isolated ground AC outlets tied individually
back to the main technical ground.
If isolated ground AC outlets are not available,
connect the cable shields at the console end only.
The shields should be floated (left unconnected)
at the peripheral device end. Ensure the periph-
eral devices connect to a clean ground through
their power cords, or through separate ground
wires to the facility’s technical ground.
POWER SUPPLY GROUNDING
NOTE: The Power Supply chassis
connects to the AC mains safety or
“U” ground wire.
AUDIO GROUND NOISES:
Buzz pickup is gener-
ally electrostatic—such as capacitive coupling
between an audio line and a power line. To avoid
audio ground noises, do not route audio lines in
the same wireway as an AC power line.
INSTALLING BACKUP BATTERIES
Three AA rechargeable NiCad batteries are sup-
plied in the 76-2001 Tool Kit. They supply a “Keep
Alive” voltage to hold each module’s logic state
during momentary power outages. They mount in
a battery clip located below the three 12" blank
panels on the right end of the console.
To install the backup batteries:
1 Remove the three blank panels located in front
of the Output modules.
Threaded
Insert for
10-32
screw
Power
Supply
Status
48 VDC
Power
Meter
Panel
Power
Power Connections —
Console Mainframe, Rear Panel
POWER SUPPLY
The power supply assembly is rack mounted (it
requires 2 RU or 3.5" [88.9 mm] of rack space)
within the console cabinetry, below and to the left
or right of the supporting countertop. The Legacy
Power Supply must be installed so that the 30
foot power supply cable supplied with the Power
Supply is not under any tension when routed
through the cabinet and connected to the
mainframe’s rear panel connectors.
Connecting the Power Supply
The power supply cable has two connectors:
• A 5-pin connector to supply 48 volt DC
power to the console.
• A 4-pin connector to supply power supply
status information (Imminent Power Loss)
to the console.
Both connectors must be attached to the back
of the Legacy and to the power supply.
DC GROUNDING NOTE: Do not
connect the audio or logic supply
ground wiring to the chassis of the
power supply.
AC GROUNDING NOTE: Do not
defeat the safety ground in any way.
Doing so may provide a potentially
dangerous condition to the operator.