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3.
POS3/COM3 auxiliary power output terminal.
Refer to "Specifications" on page 7 to determine maximum
current available.
Battery Connection
WARNING!
Using incorrect types of batteries may cause risk
of fire, explosion, or chemical leakage. Use only types of
batteries listed in "Specifications" on page 7.
Refer to "Auxiliary Current Tables" on page 8 to determine
1.
maximum current and battery capacity available.
2.
Connect the battery to the NXG-320-CPU Battery 1 input
using the supplied battery cable.
See Figure 8.
3.
If a second battery is required, connect it to the Battery
2 input before turning on the power of the NXG-320.
Ideally the second battery is fully charged, otherwise it will
take current from Battery 1 until both have the same
voltage.
Note:
Use of the second battery is not allowed is EN-
compliant installations
4.
If there is no 2nd battery connected to Battery 2 input at
power up, the smart power supply will not raise battery
missing events for the second battery.
5.
Battery 2 becomes enabled once the battery test passes.
A battery test will occur when power is connected to the
smart power supply, daily battery test, or when a user
manually activates a battery test. See keypad manual for
instructions on performing a manual battery test.
Connect Transformer and Tamper
See Figure 9.
Connect the transformer secondary voltage (16.3 VAC –
1.
10%) to the smart power supply AC/DC IN and EARTH
terminals located on the top left of the bottom board, next
to the Enrollment Switch.
2.
Connect the tamper switch of the housing to the TAMPER
input. If the input is not used, put the wire jumper that is
supplied on the product.
Note:
In the plastic housing the tamper cable must be
fastened to the housing base.
Over Current Protection
The smart power supply provides over current monitoring and
protection. When more current is drawn from the power supply
than the selected transformer can provide, the device will send
an "Over Current" message to the xGen panel. The
transformer is disconnected within 10 seconds of the condition
being applied.
Operation continues on battery supply until the condition is
removed, or batteries are exhausted.
Charging current plus all output currents are combined and
compared to the following thresholds:
•
40 VA transformer: 1.5 A rated DC/DC converter output,
current warning at 1.6 A
P/N 466-2947-ML • REV H • ISS 20MAY21
•
55 VA transformer: 2.2 A rated DC/DC converter output,
current warning at 2.3 A
LAN Wiring and Topology
See Figure 10.
The NXG-320-CPU smart power supply can be used as power
supply unit or as a bus extension/isolator. Depending in which
mode the unit is applied in the field, a different RS-485 LAN
wiring is required.
In power supply mode (option 1), only the LAN connection
terminal on the bottom board of the NXG-320-CPU is used.
Wire this terminal to the xGen panel. See Option 1 diagram.
In bus extension/isolator mode (option 2), the xGen panel LAN
needs to be wired to the ISOLATED LAN terminal on the top
board of the NXG-320-CPU. Any bus device wired to the LAN
connection terminal on the bottom board is now optically
isolated. See option 2 diagram.
Option 1 – Power supply mode, no bus isolation
See Figure 11.
Provides additional power to connect more devices.
1.
Connect suitable transformer to the smart power supply.
Connect the xGen bus NEG, LAN+ and LAN− to the NXG-
2.
320-CPU smart power supply's NEG, LAN+ and LAN−
terminal, located on the bottom board. This provides data
communication and a common ground.
Caution:
DO NOT connect xGen bus POS to LAN power
output POS 1 on the smart power supply.
3.
Use POS1/NEG, COM2/POS2 and COM3/POS3 to power
additional devices.
4.
DO NOT use the ISOLATED LAN terminal located on the
top board (POS B, NEG B, LAN B+, and LAN B-).
Option 2 – Extension/isolator mode
See Figure 12.
For larger sites requiring longer cable runs and/or more power,
up to eight NXG-320-CPU smart power supplies can be added.
In the example above, there are four buildings, three with an
NXG-320-CPU smart power supply. The main xGen bus is
looped into each NXG-320-CPU smart power supply in a daisy
chain.
This topology provides additional power and an optically
isolated LAN bus between the xGen panel and each NXG-320-
CPU smart power supply. This is useful for connecting the
xGen bus between buildings which may require optical
isolation to avoid ground loops.
Connect the xGen bus POS, NEG, LAN+ and LAN− to the
1.
NXG-320-CPU ISOLATED LAN terminal POS B, NEG B,
LAN B+, and LAN B-, located on the top board. The xGen
will power the smart power supply's isolated xGen LAN B+
and LAN B- terminals.
2.
The transformer/NXG-320-CPU smart power supply
provides power to the LAN power output POS1/NEG, and
the two auxiliary power outputs POS2/COM2 and
POS3/COM3.
The xGen panel and each NXG-320-CPU are optically
isolated from each other.
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