30 NCA-2 Manual — P/N 52482:M5 03/20/2019
Installation UL Power-limited Wiring Requirements
NFS2-640 or NFS-320 Power Supply
To power the NCA-2 using the NFS2-640 or NFS-320, make the power connections according to Figure 3.13. Set NCA-2 power-supply
supervision to the NFS2-640 or NFS-320 node number, as described in Section 5.5.7 “Supervision”.
Note that the NCA-2 will report AC power failure from the NFS2-640 or NFS-320 power supply.
Figure 3.13 Connecting Power from the NFS2-640
3.12.3 Checking AC Power
Table 3.2 contains a checklist for checking the system with AC power applied to the main power supply:
3.12.4 Power Considerations When Servicing
When servicing the NCA-2, perform the following steps before removing or connecting any power or supervisory cables:
• Remove battery/secondary power.
• Remove AC power.
• Wait 60 seconds.
• Remove all EIA-485 connections.
3.13 UL Power-limited Wiring Requirements
Power-limited (Class 2) and non-power-limited circuit wiring must remain separated in the cabinet. All power-limited circuit wiring
must remain at least 0.25 inches (6.35 mm) from any non-power-limited circuit wiring. All power-limited and non-power-limited circuit
wiring must enter and exit the cabinet through different knockout and or conduits. To maintain separations easily, it is recommended that
non-power-limited modules are grouped together. For example, use a separate row or designated side of the enclosure so that power-lim-
ited and non-power-limited wiring do not cross. Install tie wraps and adhesive squares to secure the wiring.
For a quick reference to control panel circuits, refer to Figure 2.5 at the start of this manual. The power-limiting label inside your cabinet
door identifies which compatible modules have power-limited or non-power-limited wiring.
TB7 on NFS-640
TB10 on NFS2-640 or NFS-320
Non-resettable Power
24V NONRST
+
+
24V RST
-
-
NCA2NFS640pwr.wmf
J13 on NCA-2
Cable 75636
CAUTION: REMOVE BATTERIES BEFORE CHECKING POWER
WHILE CHECKING AC POWER, MAKE SURE BATTERIES ARE NOT CONNECTED.
Component Status
NCA-2 The green Power indicator will come on when power is coming from the main power supply. The yellow Trouble
indicator will come on until batteries are connected.
Main power supply The green AC indicator will come on when AC is supplied.
The yellow Trouble indicator will come on until batteries are connected.
Table 3.2 AC Power Checklist
WARNING: REMOVE ALL SOURCES OF POWER BEFORE SERVICING
SEVERAL DIFFERENT SOURCES OF POWER CAN BE CONNECTED TO THE NCA-2. DISCONNECT ALL SOURCES
OF POWER BEFORE SERVICING. THIS DEVICE AND ASSOCIATED EQUIPMENT MAY BE DAMAGED BY REMOVING
AND/OR INSERTING CARDS, MODULES OR INTERCONNECTING CABLES WHILE THIS UNIT IS POWERED. THIS
DAMAGE MAY ADVERSELY AFFECT THE OPERATION OF THIS CONTROL UNIT, BUT ITS EFFECT MAY NOT BE
READILY APPARENT.
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