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3.
Use correct RS-485 termination.
In this example, there are four network segments.
The first is the xGen and the three NXG-320-CPU smart
power supplies - install a jumper on the TERM header on
the xGen CPU, and on the top board of the NXG-320-CPU
in building 4.
Building 2, 3, and 4 each have a new network segment.
Install a jumper on the bottom board of each NXG-320-
CPU and on the furthest device from the NXG-320.
Connect Relay Outputs
Two relay outputs are available on the smart power supply
which can be programmed to switch when certain actions
occur on the system.
Relay Modes
See Figure 13.
The two Single Pole Double Throw (SPDT) Form C relays can
be configured in 3 different modes to support different
applications.
The relays are connected to the output terminals with Normally
Open and Normally Closed connections for your convenience.
Use the jumper next to the relay to select the mode suitable to
your requirements.
Jumper
POS2 +
Common C
COM2 –
Default is no jumper with relay in NC position.
Red LEDs light up when the respective relay is energized.
No Jumper
Dry contact closure provided to output terminal. Maximum
Load 30 VAC at 1 A or 24 VDC at 1 A.
Jumper between C and COM2
Smart power supply ground provided to output terminal at
typical 0 V. Do not exceed relay rating which is maximum load
30 VAC at 1 A or 24 VDC at 1 A.
Jumper between POS2 and C
Smart power supply voltage provided to output terminal at
typical 12–13 VDC. Maximum Load at 12 V is total panel
current of 400 mA, this includes any loads connected to POS2.
Do not exceed relay rating.
6 / 52
Output
NC
C
C
NO
Current Limit Warning:
Check the current requirements of your load before
connecting!
There is no overcurrent protection on the relays when
providing buss ground or bus voltage (jumper between COM2
and C, or C and POS2). You must ensure your load does not
exceed the recommended limits above. Exceeding limits can
damage the module and pose an electrical hazard. Your panel
will report "Overcurrent Fault" or "Expander Overcurrent".
Connect Zone Inputs
See Figure 14.
Two zone inputs are available on the smart power supply.
These use the standard EOL or DEOL resistors. By default, the
zone inputs are disabled. Refer to the xGen Installation &
Programming Manual for more details.
Termination
The xGen bus must have correct RS-485 termination to avoid
communication issues with signal reflection, etc. The guideline
is to install a jumper across the TERM header on the first and
last device of the longest RS-485 cable run.
Depending on the wiring topology, the smart power supply can
create a new RS-485 bus cable.
If the power supply is the first or last device on the original RS-
485 LAN, then place a jumper on the TERM header on the top
board.
If the power supply is the first or last device on the new
isolated RS-485 LAN, then additionally place a jumper on the
TERM header on the bottom board.
Mains Power Connection
1.
Mains power shall be connected using an appropriate all-
pole disconnect device, installed external to the equipment
wall enclosure.
2.
The NXG-320-CPU must be connected to an approved
SELV supply.
3.
Ensure the backup batteries are connected. See"Battery
Connection" on page 5.
4.
Turn mains power on.
5.
When ISOLATED POS B and NEG B are connected and
powered, the power LED near the ISOLATED terminal will
be lit.
6.
When AC/DC IN are connected and powered by
a transformer, the power LED on the right of the
Enrollment switch will be lit.
xGen System Enrollment
Automatic Enrollment
1.
Push and hold Enrollment switch on the xGen panel for
3 seconds until it blinks.
See Figure 15.
P/N 466-2947-ML • REV H • ISS 20MAY21
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