Crown Audio CT875 8-Channel Rackmount Power Amplifier (75W/Channel @ 8 Ohms) - Manual (Page 12)

Operation Manual
CT Power Amplifiers
page 12
10.1 Deep Sleep
In deep sleep mode, the amp consumes less than 1
watt of power. It is activated via the AUX port with a
ground closure.
To bring the amplifier out of deep sleep, remove the
ground closure via the AUX port.
10.2 Amp Status
The Amplifier Status is designed to work with life
safety or supervisory monitoring and control systems,
where notification of an amplifier fault is necessary.
The Amplifier Status is producing a signal
(Heartbeat or tone) when the amplifier is operating
within standard working parameters. If the amplifier
enters a fault or thermal condition, the Amplifier
Status signal will terminate. This feature in the
ComTech amplifier is always on. The Amplifier
Status is located on the Auxiliary Port, opposite the
DEEP SLEEP function. The configuration of the Amp
Status signal is possible through DIP Switch #3:
• ON – the microcontroller will send a 1 Hz
pulse to the “AMP STATUS” AUX port line
• OFF – the microcontroller will send a logic
high level to the “AMP STATUS” AUX port line
The voltage output of the AuxPort is 5VDC at 50
milliamps. This TTL or similar signal can then be
connected to an interface to indicate the status to a
supervisory control system.
Amp status can be used in a variety of life safety
applications, such as EN54, IEC60849 among others.
10 Auxiliary Port 11 Input Routing
This amplifier can route a single channel to the next
numbered channel.
In CT 475 and CT 4150, DIP switches 6-9 are
non-functional.
When a DIP switch is set to “on” for a specific channel,
it sends the signal to its own output AND becomes the
input for the next numbered channel, overriding the
wired input for that channel.
Figure 11.1
Channel 1 intput sent to all channel
outputs, overriding channel inputs for
channels 2,3, and 4
Figure 11.2
Four input signals sent to four outputs
Figure 11.3
Channel 1 input sent to channels 1, 2, and 3
Channel 4 input sent to channels 4, 5, and 6
Channel 7 input sent to channels 7 and 8