Rear Panel - JRC Alphatron Marine AlphaAnnounce Installation And Operation Manual

2.4 Rear Panel

3. 'LOW IMPEDANCE INPUTS': audio inputs for Digital Amplifier low impedance outputs
4. '24 VDC IN' for 24 V dc supply from either the Digital Amplifier unit (max. 500 mA) or
an external additional power supply unit
5. 'CTRL IN' input (8 pin RJ-45 connector) for the control from the Digital Amplifier unit
6. Loudspeaker constant voltage outputs and 24 V dc commands for override relays or
faulty amplifier change-over
1. 'LOW IMPEDANCE INPUTS': audio inputs for Digital Amplifier low impedance outputs
2. '24 VDC IN' for 24 V dc supply from either the Digital Amplifier unit (max. 500 mA) or an external additional power
supply unit
3. 'CTRL IN' input (8 pin RJ-45 connector) for the control from the Digital Amplifier unit
4. Loudspeaker constant voltage outputs and 24 V dc commands for override relays or faulty amplifier change-over
Note Each command for override relays can have a max. current of 1 A, yet the real available current depends
on the 24 V dc power supply unit connected to the Transfer Unit. For example, if the Transfer Unit is supplied
from the Digital Amplifier unit, the available current for all override relays shall not exceed ca. 250 mA (reserving
other 250 mA of the total 500 mA for the Transfer Unit internal circuit).
27 | AlphaAnnounce Transfer Unit
Terminal for each of the 8 lines
1. Loudspeaker output + (100 - 70V)
2. Loudspeaker output -
3. Ground (linked to the pin 5)
4. Command + (24VDC)
5. Command - (ground)