I N S T A L L A T I O N a n d P O W E R
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220 / March 2000
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 Supply
The 220 console is powered by a Wheatstone Model PSC-D340
rackmount power supply. This heavy duty unit occupies three 19” wide
rack spaces (total height 5-1/4”). Convection cooled, it requires ample
ventilation space above and below it. Do not mount heat generating
devices in the same rack cabinet.
Note the power supply should be mounted in an equipment rack within
fifteen feet of the console (but no closer than 3 feet). Avoid locating any
high gain equipment (such as phono preamps, tape recorders, etc.) too near
the rackmount supplies, to avoid magnetic interference into that equip-
ment.
220 / June 2001
If failsafe redundant sup-
plies have been ordered,
you will be installing two
units and an additional
rackmount panel.