Lab.gruppen C Series 5:4X - Manual (Page 13)

C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual rev. 1.1.4
Installation
6
3.3 Cooling
The amplifier uses a forced-air cooling system with air flow from front-to-rear, maintaining a low
operating temperature within defined limits. Front-to-rear airflow is preferred as cooler air is present at the front
in nearly all installed applications. (This allows higher continuous power levels without encountering thermal
problems.) Never attempt to reverse the airflow. The amplifier modules require a pressure chamber between
the 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 has
sufficient space to allow the exhaust to escape. If the amplifier is rack-mounted, do not use covers or doors on
the front or rear of the rack.
Should a heat sink overheat, the temperature sensing circuits will mute the overheating channel. If the power
supply overheats, another sensing circuit will mute all output channels until the power supply cools to safe
operating temperature. An early warning before shut down will be indicated on the front-panel LEDs, and a
warning will be sent through the NomadLink network.
Always make sure that the dust-filters behind the detachable front panel are clean to ensure maximum possible
airflow.
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-ning
system, please refer to the Current Draw and Thermal Emissions specifications provided in the Appendix
(section 8.4).
3.4 Operating voltage
All C…X amplifiers have a universal power supply that accepts mains voltages from 100-240 V (+/- 10%) @ 50
or 60 Hz. An IEC male receptacle is provided on the rear panel of all amplifiers. The IEC cord included with
each amplifier has a male plug appropriate for the power receptacles in the country in which it was sold. If
substituting a different IEC mains cord for use in another country, use only a cord that meets or exceeds the
power 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 high
speed 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 personnel
to do the job.