I N S T A L L A T I O N a n d P O W E R
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A-7000 / Sep 2002
(B) THE POWER COMPANY EARTH CONDUCTOR that enters the build-
ing at the power line breaker box; this conductor should be (and is often by code)
tied to the above-mentioned earth ground at one point. This point is the SYSTEM
EARTH GROUND.
TIE THE CONSOLE GROUND LUG TERMINAL STRIP TO THE
SYSTEM EARTH GROUND. TIE EVERY PIECE OF EQUIPMENT IN
THE ENTIRE AUDIO SYSTEM TO THE CONSOLE GROUND LUG
TERMINAL STRIP. If the system earth ground point is inaccessible, tie
the console ground terminal strip to the power company earth conductor
at the main breaker box (see drawing "Typical Grounding Scheme" on
previous page).
Each piece of equipment should be connected by its own ground wire
(usually the round third pin on the AC cord). This means that every AC
outlet must have a separate conductor run to the console ground lug
terminal strip; the outlets cannot be daisy-chained as is normally encoun-
tered in commercial and residential AC systems. Any equipment not
supplied with 3-wire AC cables must have individual ground wires (16
gauge or larger) connected to their chassis grounds and then run to the
console ground lug terminal strip.
Further Grounding Details
Check all equipment to be absolutely certain that each unit is power
transformer isolated from the AC mains to prevent safety hazards.
It is assumed that in each piece of audio equipment the audio ground
and the chassis are tied together at some point. Any piece of equipment
lacking a grounded chassis is likely to be prone to interference problems.
Locate all unbalanced audio equipment in the same rack if possible, to
minimize chassis ground potential differences. It may also be helpful to
insulate each piece of unbalanced equipment from its mounting rails in the
rack by means of nylon 10-32 screws and insulating washers between rails
and faceplates.
Once the system is properly grounded, proceed with the console
power supply installation and connection (next section).
Power Supplies
The A-7000 console is powered by a Wheatstone Model PSC-6008
rackmount power supply. This heavy duty unit occupies five 19” wide rack
spaces (total height 8-3/4”). Convection cooled, it requires ample ventila-
tion space above and below it. The PSC-6008 generates a lot of heat in the
course of normal operation — do not mount heat sensitive devices in the
same rack cabinet.
If failsafe redundant sup-
plies have been ordered,
you will be installing two
units.