Installation
14
ALR-AMP-8 Alero 8 Zone Power Amplifier
Pin 10 - Status GND
Pin 10
on the 10-pin I/O port provides a ground reference for the Output pins (7-9), and is required for any device that
needs to sense the potential.
Pin 10 connects to the GND pin of an I/O port on an external controller, such as a NetLinx Central Controller (see
FIG. 16).
On/Off Control (12V Trigger, 3-5V Trigger and Signal Sense)
The Alero ALR-AMP-8 can be powered on and off externally by using the two signals 12V trigger and 3-5V trigger.
A Signal Sense function is also provided which automatically can switch on the Alero in the event of an audio signal and
switch off the Alero to enter standby mode when no audio signal has been present on the signal terminals for
approximately 13 minutes.
The Signal Sense function consists of an audio detection circuit and a timer. If an audio signal of more than typically
1.3 mVrms is present on the Signal Sense terminals, the Alero will always be in the On mode. If none of the two triggers
are high and audio is not present at the terminals the timer will switch off the Alero after 13 minutes.
Enabling and Disabling Zones
The 8-position dip switch labeled "
ZONES
" provides the ability to individually enable or disable any of the 8 Zones. It is
recommended to disable Zones that are not being used, to lower power consumption.
To disable a Zone, flip the associated switch (1-8) from
Enable
(default setting) to
Disable
(FIG. 18):
The UP position enables each Zone; the Down position enables each Zone.
See page 16 for a NetLinx code example that illustrates configuring the port (on an
NI-3100 NetLinx Central Controller) to properly monitor inputs from the On Signal,
OC and Thermal functions.
Pins 1 and 2 on the 10-pin I/O port provide Signal Sense (+ and -) inputs. See the Pin
1 - Signal Sense section on page 10 for details.
When changing control signals from on mode to standby mode, there is a 200ms
delay before the main SMPS turns off. This is to provide time for internal circuitry to
power down in order to meet the standby mode current draw requirements.
FIG. 18
ZONES Dip Switch
Enabled
(default setting)
Disabled
