Oxygen 7Oxygen 7 - CONNECTING MAINS POWER
Pag. 5
3 CONNECTING MAINS POWER
WARNING: Make sure the power supply voltage is correctly set to match your local mains voltage. Refer to
the Power Supply Chapter in this operating manual. Before connecting the Oxygen 7 to mains power,
determine the actual mains voltage and confirm that the Oxygen 7 has been configured correctly. As could be
expected, an incorrect mains configuration could seriously damage the unit. Should it be necessary to change
the unit’s operating voltage refer to the Power Supply Chapter in this operating manual
The Power Supply unit accepts mains voltages 100 and 230V AC by setting the position of an internal switch.
The PSU is fused with a 2 Amp slow blow fuse for 110 Volt or 1.2 Amp slow blow fuse for 230 Volt. DO NOT
use any other value, as this would be hazardeous, and the guarantee will be void.
Make sure that the IEC mains plug is pressed fully into the MAINS INPUT socket.
Connecting the DC Cable: Plug the cable into the power supply MIXER CONECTION socket. Press the
plug into the socket, and screw on the locking ring to hold it firmly in place. Plug and secure the other end into
the console PWS socket.
Turning the Console On or Off: First check that the mains and DC leads are correctly plugged in and
secured. Turn on the power supply using its rear panel mains switch. The console must be connected to the
power supply before turning it on. To avoid loud pops in the speakers make sure that the connected power
amplifiers are turned off before switching the console on or off.
WARNING: To avoid damage to the speakers always switch the power amplifiers on last and off first.
The console meters pulse briefly on power up. This is normal.
3.1 EARTHING
The connection to earth (ground) in an audio system is important for two reasons:
1. SAFETY
2. AUDIO PERFORMANCE
For safety it is important that all equipment earths are connected to mains earth so that exposed metal parts
are prevented from carrying high voltage which can injure or even kill the operator
The same earth is also used to shield audio cables from external interference such as the hum fields
associated with power transformers, lighting dimmer buzz, and computer radiation. Problems arise when the
signal sees more than one path to mains earth. An earth loop results causing current to flow between the
different earth paths. This condition is usually detected as a mains frequency audible hum or buzz. To ensure
safe and trouble-free operation we recommend the following:
Use a clean mains outlet for the audio system: Be sure to use a 'clean' power outlet, i.e. one that
is fed directly from the mains, including earth. "Polluted" mains are caused by changing currents on the outlets,
such as air-conditioners, coffee machines, fridges, computers, dimmer packs etc. DO NOT connect any of
these types of items to the Oxygen 7 main power outlet.
Use star point earthing: Grounding MUST BE a starground system.You have to install a ‘star point’
system where the individual earths to the equipment racks and equipment areas are separately run from a solid
central reference earth point.
It is advisable to install several multiple mains connectors close to the Oxygen 7, with a master power switch to
shut down all power to the studio..
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