Sentry Industries 5000 사용자 설명서

 

Not supplied with Sentry, but necessary to the installation 
and operation is the three conductor wiring which connects 
the controller to the modules.  Before this wiring is 
installed it is important to read and understand the 
installation instructions (Chapter 3) because significant 
economies can be realized by connecting more than one 
module onto a common wiring run.  This standard feature 
is accomplished by multiplexing the signals from the 
modules to the controller. 

Transparent to the user is the data transfer which occurs on 
the installed interconnect wiring.  Two of the conductors 
are used to pass direct current (DC)  from the controller to 
the modules. The third wire transfers a series of very rapid 
pulses between the controller and the sensor modules.  This 
digital transfer of information is an important feature of the 
system which significantly reduces RFI and EMI problems. 

The standard system requires 120 VAC, 60 Hz, at 0.5 Amp 
electrical supply.  A factory option can be ordered for 
220 VAC operation.  DC voltage (12 to 28  VDC) can be 
used for standby power.  The system will automatically 
switch to supplied DC operation at any time the AC 
voltage is interrupted. 

The system includes a lithium battery for RAM memory 
retention during power interruptions.  To ensure 
continuous trouble free operation, however, the primary 
power source must be one which is continuous and reliable, 
preferably dedicated to this equipment.  Battery back-up or 
emergency power is recommended to insure continuous 
operation.