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Connector Name
12V Out
Battery In/Out
(only in power
supply with charger)
Temperature Sensor
AC/DC Main Power
Input
Description
In systems with I/O
expansion, provides 12V
output to expansion power
supplies on expansion
frames.
Battery charger output when
the main power exists.
Backup power input from
battery when the main power
fails.
Sensor for battery
temperature to control
charging level.
Cable inlet for main power
cable (AC or DC)
3-7
Power Supply Module and Backup Battery
Notes
Pin 1- PGND
Pin 2- 12V DO
Pin 3- GND
Pin 4- MAIN (12V)
The power supplies on I/O expansion
frames can be attached via DC cable to
the power supply on the previous I/O
expansion frame in a daisy-chain
manner, or directly to the main power
supply. In this case, the main power
supply controls the entire RTU. This
enables the user to turn off the entire
RTU simply by turning off the main
power supply.
If the main power supply does not
control all other power supplies in the
RTU, it is recommended to have a
single on/off switch to control all power
supplies simultaneously.
The charging voltage level is controlled
by the battery charger and is a function
of the temperature.
(In modules with power supply and
charger only)
For more information, see the Backup
Battery section below.
The cable is part of the RTU frame
(connected to the power junction box.)
Note: When the cable male connected is
place in this input, it locks the power
supply module in its slot. To remove
the power supply module, first unplug
the power input cable.
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