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Bittner Audio - Application Handbook
3.8.6.1.4.
Control Modes
The backup switching may be activated in two different ways, which are selected by DIP switch 3
of block SW3:
˜
ON: Control by a connected SXL
˜
OFF: Control by the ALIVE contacts of the connected amplifiers or any other potential-
free contact
When using the contact inputs, a single contact will control one amplifier (2 channels). This contact
is directly compatible with the ALIVE (fault detection) contacts of Bittner Audio amplifiers.
In addition, any other potential-free contact may be used. The switching will take place after the
contact has been activated (amplifier defect will be indicated by either an opened or a closed
contact). This logic operation (positive-negative) needs to be set with DIP Switch block SW 2 for
each amplifier.
If connected to an SXL, the contact closures may not be used.
3.8.6.2.
Connection of Amplifier
3.8.6.2.1.
Signal and Amplifier Inputs
The signal inputs of the individual channels may be connected to the PHOENIX terminals
Signal
Input CH1 – CH14
.
Since the back amplifier does not have its own input, only 14 inputs are needed on the
AX16. The input signal of the backup amplifier is made up of the input channels of the
faulty amplifier. This also guarantees that the level of the faulty amplifier is relayed on to
the backup amplifier.
The input signals are then available on the PHOENIX terminals
Amplifier Input Ch1 – CH16
.
In case of failure, the backup amplifier will receive its audio signal from the AX16. This is
the reason why 16 channels (AX16 -> amplifiers) are available.
