Operation Manual; 10.1 Deep Sleep; 10.2 Amp Status- Page 13

CT Power Amplifiers

page 13

CT Power Amplifiers

Operation Manual

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