User manual

THRESHOLD SCHEDULLING

The threshold can be constant or be scheduled over 4 periods

per week days. Threshold scheduling allows for automatic

adjustment of the sound level over the time. For example, it

is possible to automatically set a different threshold during the

working hours, the evening and nights. Or even during week’s

nights and weekend’s nights.

Threshold setup is done through the installer menu.

LOGIC OUTPUTS

The rst logic output, called warning output, is usually used for

signalling that the sound level threshold has been exceeded

and the second, called alarm or cut-off output, usually to shuts

off the electrical power if the sound level has not been reduced

after the warning.

NOTE: the logic outputs must be enabled from the

installer menu.

Logic outputs are triggered if the equivalent continuous sound

level (LEQ) over a user adjustable period of time exceeds the

threshold. In the installer menu, installers have the ability to

setup three time periods as follow:

• Warning time period: if the LEQ value over this

period exceeds the actual threshold, the rst logic

output is triggered.

• Cut-off time period: if despite the warning the LEQ

value over this period exceeds the actual threshold, the

second logic output is triggered.

• Recover-after time period: if the LEQ value over

this period is under the actual threshold, both warning

and cut-off outputs are resettled. The recovering time

can also be set in ‘manual’ so that only an operator

knowing the installer menu’s pin code can reset the

logic outputs.

NOTE: If the microphone is disconnected the warning

relay will operate. If the microphone is not reconnected

within 10 seconds the alarm relay will activate.

The graph bellow illustrates the principle of operations of the

logic outputs. In this example, the threshold has been set to

110 dB, the warning time period to 30 seconds and the cut-off

time period to 1 minute.

At the second 70, the music has exceeded the threshold and

the warning time period has start counting. The LEQ has been

computed over the following 30 seconds but the result was

below the threshold. So nothing happened.