Bedienungsanleitung Allen-Heath PA-CP Series (Seite 11 von 36) (Englisch)

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PA-CP User Guide 11

Mains Power and Earthing

Connecting Mains Power Read the SAFETY INSTRUCTIONS printed at the front of this

user guide and on the rear panel. The power supply is wired for the local voltage required. Check that

the correct mains lead with moulded plug has been supplied with your console, and that the marked

voltage matches your local supply. Ensure that the IEC mains plug is pressed fully into the rear panel

socket before switching on.

To avoid any unexpected audible clicks or thumps

turn connected power amplifiers down or off before

switching the console or any other signal equipment on or

off. The built-in amplifiers include an automatic turn on delay

for this purpose.

Switching On Press the rear panel ON/OFF switch in. The

front panel blue power LED lights. You should hear the

speaker relays switching in after a second or two. This avoids

audible thumps while the circuits stabilise. The front panel SPK

OFF indicators light while the speakers are isolated. You may

also hear air movement as the internal fans start up. The

meters and several other LED indicators may pulse briefly.

This is quite normal.

Switching Off Release the rear panel ON/OFF switch. The

relays switch off instantly to protect the speakers from any

switch off thumps.

Earthing The connection to earth (ground) in an audio system is important for two reasons:

SAFETY to protect the operator from high voltage electric shock, and AUDIO PERFORMANCE to shield

the audio from interference.

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. It is

recommended that the system engineer check the continuity of the safety earth from all points in the

system including microphone and instrument metal, equipment cases, rack frames, and so on.

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’ (ground 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:

• Have your mains system checked by a qualified electrician If the supply earthing is solid to

start with you are less likely to experience problems.

• Do not remove the earth connection from the console mains plug The console chassis is

connected to mains earth through the power cable to ensure your safety. Audio 0V is connected to

the console chassis internally.

• Deal with ground loops Should you experience hum or buzz caused by earth loops, check first

that each piece of equipment has its own separate path to earth. If so, operate earth lift switches

on connected equipment in accordance with the instruction manuals. Alternatively, disconnect the

cable screen at the destination end only. This breaks the offending loop while still maintaining the

signal shielding down the length of the cable.

• Use low impedance sources such as microphones and line level equipment rated at 200 ohms or

less to reduce susceptibility to interference. For high impedance instruments use DI (direct inject)

boxes such as those readily available from most music equipment suppliers. The console outputs

are designed to operate at very low impedance to minimise interference problems.

• Use balanced connections for the microphone inputs and main outputs as these provide

further immunity by cancelling out interference that may be picked up on long cable runs. Refer to

the cable diagrams for details on how to connect balanced and unbalanced equipment.

• Route cables to avoid interference To avoid interference pickup keep audio cables away from

mains power units and cables, thyristor dimmer units or computer equipment. Where this cannot

be avoided, cross the cables at right angles to minimise interference.

• Use good quality cables and connectors and check for correct wiring and reliable solder joints.

Use the correct cable type. Allow sufficient cable loop to prevent damage through stretching.

If you are not sure ... Contact your service agent or local Allen & Heath dealer for advice.

CAUTION

RISK OF ELECTRIC SHOCK

8 OHMS4 OHMS

CONSTANT POWER SWITCH

DO NOT OPEN

SERIAL NUMBER

FUSE

V AC ~ 47- 63 Hz

1600W MAX

MAINS INPUT

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE

ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTI

SEE OPERATING MANUAL BEFORE USING.

NO USER SERVICEABLE PARTS INSIDE.

DO NOT OBSTRUCT VENTILATION OPENINGS.

RISK OF HAZARDOUS ENERGY! MAKE PROPER SPEAKER CON

THIS APPARATUS MUST BE EARTHED BY THE POWER CORD.

DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.

AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.

WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK

100-240V T10A L

ENGINEERED IN ENGLAND BY ALLEN & HEATH Ltd.

REPLACE

ON/OFF

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