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Revision
D.1
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12
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2-4
2 Installation
digital
POWER SUPPLY
The 99-1205 power supply requires 2 RU of
rack space within the console cabinetry, below and
to the left or right of the supporting countertop.
The 48 Volt Power Supply must be installed so
that the 30 foot power supply cable (90-1709) 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 status
information (Imminent Power Loss) to the
console.
Both connectors must be attached to the back
of the BMX
digital 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.
Redundant Power Supply
To provide redundant console power, two
99-1205 power supplies can be connected to the
console through a 99-1203 48 Volt Coupler.
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 should NOT
be installed until the console is completely installed
and is ready for everyday use.
The batteries supply a “Keep Alive” voltage that
holds each module’s logic state during momen-
tary power outages. They mount in a battery clip
located below the three 12.25" blank panels on
the right end of the console.
Threaded
Insert for
10-32 screw
Power Supply
Status
48 VDC
Power
Meter Panel
Power
Power Connections —
Console Mainframe, Rear Panel