Wheatstone TV-80, Technical Manual

Page: 20 / 120

M A I N F R A M E I N S T A L L A T I O N
page 1 – 4
TV80 / Aug 98
An “isolated AC ground”
studio outlet (usually or-
ange in color) can also
be used to accomplish
the required grounding.
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 encountered 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
For a complete discussion of TV-80 power supplies, see the
“TV-80 Power Systems” chapter of this manual (page 9-1). For the
purposes of the current chapter, you should properly rackmount the
PSR with SPS-40 units (console) and PSR with SPS-180 units
(preselector panels, event computer and rackmount smart select cage)
power supplies and connect them to their associated equipment as
described in the “Power Systems” chapter. (If failsafe versions have
been ordered, you will be installing two units of each type.)
Note the power supplies 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 equipment.
Once the supplies are rackmounted, they should be connected to
their respective equipment using the supplied cables. Note that each
cable’s 10-pin female connector has to be rotated until its locating pins
match the male connectors on the equipment it powers. Do not force a
connector on; it attaches easily when properly aligned. Connect the
cables first to the rear of the their associated equipment, then to the rear
of each rackmount power supply.
TV80 / Dec 04