Honeywell NETAXS NX4L1, Installation Manual, Page: 19 / 86

NetAXS™ NX4L1 Installation Guide
Panel Components and Descriptions
NetAXS™ NX4L1 Access Control Unit Installation Guide , Document 7-901099V3
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3.2 Power Supply
The NX4L1 uses an internal 24 VDC nominal regulated power supply. The supply
uses provides 24 VDC at 5 amps for the system power. The supply also charges and
monitors the condition of the batteries. Wire the unswitched electrical power to the
supply per the National Electrical Code as well as any local electrical codes, including
the safety ground wire.
An AC input power indicator is supplied, and it is illuminated when AC input voltage
is present. If the indicator is off, the AC input voltage is off, or too low to operate the
system.
CAUTION De-energize the unit before servicing it. For continued protection
against the risk of electric shock and fire hazard, replace the AC terminal block input
fuse with the rating of 3.5 A, 250 V. The power supply in the NX4L1 is not
serviceable by the customer and does not contain any serviceable parts. Do not open
or remove the power supply cover.
3.3 Batteries
For the NX4L1, two 12 VDC, 7 Ah sealed lead-acid batteries (Honeywell order
number 3-000066) wired in series must be used to have backup battery capability. The
batteries will provide standby backup power, depending upon system configuration
and activity. The batteries are wired in series (positive on one battery to negative on
the other) and connected to the BATT + and BATT – terminals on the 24 VDC power
supply in the NetAXS enclosure. When AC is lost, the power supply automatically
switches to the backup batteries for continuous 24 VDC power. The power supply has
deep discharge protection, and it can provide a Low Battery signal to the panel if it is
connected to a supervised input on the NetAXS panel. Refer to the system wiring
diagram for details. Replace the batteries every 2 to 2.5 years, or more often if the
system has a high rate of backup use.
3.4 Enclosure
The enclosure is 450 mm (17.7 in.) wide, 607 mm (23.9 in.) high, 90 mm (3.54 in.)
deep. The enclosure is shipped pre-wired.
3.5 Suppressors
Two suppressors (HAS number S-4) are required for each door lock. One suppressor
is installed on the panel control board, and the second must be installed at the door
lock.