UDACT Instruction Manual — P/N 50050:M 12/18/2009 89
Wiring NFS2-640, NFS-320, (UL 9th) and NFS-640 (UL 8th)
Connect 24VDC filtered, non-resettable power from the CPU-640 TB7 to TB1 terminals 1 and 2 on
the UDACT.
F.3.2 Notes
1. Ferrite cores, PN 29090, are recommended for all applications.
2. Recommended wire is 12 AWG (3.25mm
2
) to 18 AWG (0.75mm
2
), twisted pair, shielded
cable. Connect only one end of shield: a) shield may be connected to cabinet (earth ground) at
fire alarm panel, or b) shield may be connected to TB1 Terminal 5 (Shield) at UDACT as
shown in Figure F.1.
3. Conduit is recommended for external wire runs. Consult local building codes.
4. Refer to "Specifications" on page 13 for power requirements.
Below is a remote installation of a UDACT with NFS2-640/NFS-320:
Figure F.1 UDACT and NFS2-640/NFS-320 in Separate Cabinets
NOTE: The shield end that is not connected should be insulated to prevent accidental grounding.
Do not connect both ends of shield under any circumstance since a ground fault may result.
EARTH
Comm FAILURE
+24V
+24V
GND
RS+
RS–
SHIELD
RS+
Rs–
ACS/TERM
TERM
01
11
To Phone Lines
(supervised)
Solid Earth
Ground
Connection
NFS2-640/NFS-320
in Separate Cabinet
CPU2-640/
CPU-320 TB11
DO NOT USE
Ferrite Cores
CPU2-640/
CPU-320 TB10
24VDC
nonresettable
power
UDACT-23.cdr
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