Lab.gruppen C 20:8X Operation Manual

Also see for C 10:4X: Specifications Specifications Supplementary guide Operation manual Installation

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Lab.gruppen C 20:8X Operation Manual Manual pdf 13 page image

C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual rev. 1.1.4Installation63.3 CoolingThe amplifier uses a forced-air cooling system with air flow from front-to-rear, maintaining a lowoperating temperature within defined limits. Front-to-rear airflow is preferred as cooler air is present at the frontin nearly all installed applications. (This allows higher continuous power levels without encountering thermalproblems.) Never attempt to reverse the airflow. The amplifier modules require a pressure chamber betweenthe fans and heatsink, and this effect functions only in one direction.Make sure that there is an adequate air supply in front of the amplifier, and that the rear of the amplifier hassufficient space to allow the exhaust to escape. If the amplifier is rack-mounted, do not use covers or doors onthe front or rear of the rack.Should a heat sink overheat, the temperature sensing circuits will mute the overheating channel. If the powersupply overheats, another sensing circuit will mute all output channels until the power supply cools to safeoperating temperature. An early warning before shut down will be indicated on the front-panel LEDs, and awarning will be sent through the NomadLink network.Always make sure that the dust-filters behind the detachable front panel are clean to ensure maximum possibleairflow.If the amplifier malfunctions due to dirty dust-filters,any required repairs are not covered by the warranty.To calculate the maximum heat emission value when installing the amplifiers in rooms with an air-conditio-ningsystem, please refer to the Current Draw and Thermal Emissions specifications provided in the Appendix(section 8.4).3.4 Operating voltageAll C…X amplifiers have a universal power supply that accepts mains voltages from 100-240 V (+/- 10%) @ 50or 60 Hz. An IEC male receptacle is provided on the rear panel of all amplifiers. The IEC cord included witheach amplifier has a male plug appropriate for the power receptacles in the country in which it was sold. Ifsubstituting a different IEC mains cord for use in another country, use only a cord that meets or exceeds thepower rating of the originally supplied cord.Once a suitable AC supply is connected, the amplifier can be turned on using the front-panel power switch.The amplifier then goes through a soft-start sequence as it self-checks its circuits. The fans will blow at highspeed before dropping to idle, and the “power” LED will illuminate.Inrush power is controlled and limited during “soft-start”, enabling multiple amplifiers to be powered up simulta-neously with no danger of overloading the mains power circuit.If you are not 100% confident of your competence to replace the mains plug, engage qualified personnelto do the job.