7.0 Installation - Electrical
7.1 Local Electrical Voltage
Before connecting the Cinemix, check the AC supply voltage setting by looking
at the sticker on the back of the rack mount power supply. This should be
115V for use in areas with an AC supply between 100V and 120V, and 230V
for use in areas with an AC supply between 220V and 240V.
Allow for a 30second wait between switching the Cinemix power supply(s) on or
off.
The main fuse is a 6.3 amp fuse with a 250 volt rating (10 amp fuse in America
with a 125 volt rating). After replacing a blown fuse with the correct size and
rating, turn the power supply on and check the three LED indicators. If you are
still missing one or more of the power rails, turn off the power supply and call
the D&R Technical Support Department.
NOTE: DO NOT REPLACE THE FUSE WITH ANY OTHER TYPE AS
THIS CAN BECOME A SAFETY HAZARD AND WILL VOID YOUR
WARRANTY.
7.2 Electrical Wiring
To take full advantage of the excellent signal to noise ratio of the Cinemix, it is
necessary to read this part of the manual carefully.
Hum, radio frequency interference, buzzes and instability are often caused by
improper wiring and poor grounding. All equipment using three wire ac
connectors should have a ground lift adapter on each cable before plugging into
the ac outlet. In most cases, the incoming electrical ground is inadequate and a
dedicated ground system should be installed for the audio equipment. Your
local electric power company will provide you with all local electrical codes and
safety regulations.
There are some ground rules to follow. All signals in a recording studio are
referenced to ground. This ground must be clean and free of noise. A central
place (central to all equipment) should be selected as the "central star ground
point" and all grounds should terminate at this point. This point can be a solid
metal plate with at least 50 places to hookup all incoming grounds.
This is commonly referred to as a "star ground system".
In some instances electrical contractors will daisy chain ground connections in
the AC distribution system. This is not suitable for a studio. Ideally, run a
separate ground wire from each piece of equipment to the "central star ground
point". The "central star ground point" should be connected to a pair of
eight foot ground rods using larger (#10) wire than your equipment ground
wires.
Cinemix manual page: 47
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