Intellivox DDC Installation Manual Installation Guide | EN 7 |
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A simple surveillance function may be realized by means of the ‘failure detect’ connection in case the RS- 485 network interface is not used. Three relay contacts, ‘normally open’ (NO), ‘normally closed’ (NC) and ‘common’ (COM) are available on this connector.
If the autogain function of the Intellivox is used, a separate ambient SPL/temperature sensor has to be installed and connected. This automatic volume adaptation feature will only function properly if the signal, which is detected by the microphone inside the sensor, is representative for the diffuse ambient noise level. For this reason the sensor should be kept away from direct sound sources such as talking people, outlets of the air conditioning system or other loudspeakers. The implemented software protocol freezes the volume setting when an audio signal is present in order to prevent ‘hunting’ of the column’s gain setting caused by its own acoustical output. All relevant autogain parameters can be adjusted by means of the
If the ambient temperature is expected to exceed 40°C an external fan should be connected to ensure proper operation of the Intellivox under all circumstances. For this purpose an external 24 V relay should be connected to the terminal block marked ‘Fan Relay’. Because of the limited drive current an external relay must always be used to switch the fan, do not connect a fan directly to this terminal! The external relay (if connected) will be engaged if the heatsink temperature exceeds the threshold. The fan should be mounted on a location ensuring sufficient airflow along the heatsink.
In case the Intellivox is installed outside or in another environment with a high expected humidity, the electronics should be treated with an insulation substance to prevent defects due to condensing moisture. If specially ordered, this can be done during the manufacturing process.
To prevent damage to the loudspeakers due to frozen moisture inside the
Bosch Security Systems July 2003