4
NAC (Notification Appliance Circuit) Outputs
The 4009 IDNet system board provides 4 hardwired NACs. NACs 1 through 4
are Class B, reverse polarity Notification Appliance Circuits. Each circuit has one
polarity for supervision state and the opposite polarity for alarm state. Field wiring
terminations are provided for 12 AWG - 18 AWG wire. Refer to the 842-068
Field Wiring Diagram for complete wiring, compatible appliances, current, and
line distance information. Each circuit is capable of being independently
controlled by the 4009 IDNet, as commanded by the host panel.
The notification circuits use a 10k end-of-line resistor for supervision. The circuit
is monitored for short and open circuit line faults when in the standby (not
energized) condition. In the event of a short circuit, the 4009 IDNet will not
activate the NAC while the short circuit fault is present. During coded signal
operation, the 4009 IDNet checks for a short during each “off”, and holds the
circuit off if a short is detected. Short and open circuit faults are reported to the
host panel via the command channel (either IDNet or hardwired, depending on
configuration) and can be identified by a blinking trouble LED on the 4009 IDNet
during supervisory state.
The NACs are configurable as “Class A” circuits with the addition of an option
card that plugs onto the base board. The option card also provides the additional
field wiring terminations needed for Class A. The 4009 IDNet monitors for
insertion of the Class A Option Card. The presence of the Class A Adapter Option
Card must match the Hardware Configuration Switch (SW1) for proper operation
(see Table 1).
In addition, when configured as an IDNet peripheral, each NAC has the ability,
under software control, to disconnect its supervision, allowing earth fault
isolation (this operation is also performed automatically as part of the power-up
sequence).
Battery Charger
The battery charger charges lead acid batteries up to 18AH. Batteries are
supervised for low/missing battery and depleted battery. The battery charger
output remains disabled until a battery is sensed.
Battery Cutout Module (Canadian Version only)
The Canadian version of the 4009 IDNet NAC Extender includes a low battery
cutout module and harness. The factory installed battery cutout module replaces
the standard (US version) battery harness. The module disconnects the batteries
if the terminal voltage drops below 19.3VDC during battery standby operation.
Connection to the batteries is restored on resumption of AC power.
Continued on next page
4009 IDNet NAC Extender, Continued
Hardware Components
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