NCA-2 Manual — P/N 52482:M5 03/20/2019 29
Connecting Power Sources and Outputs Installation
3.12 Connecting Power Sources and Outputs
3.12.1 Overview
Complete all mounting procedures and check all wiring before applying power. Electrical connections include the following:
• Primary power source. +24VDC, delivered through:
• AMPS-24/AMPS-24E main power supply. If AMPS-24/E is mounted in a separate cabinet, power-supply wiring must be in
conduit (for cabinet placement information see the AMPS-24/E manual.
• the NFS2-640 or NFS-320 on-board power supply.
•a supervised +24VDC power supply that is UL/ULC-listed for fire protective service.
• Secondary power source. +24 VDC from batteries, installed in the cabinet with the NCA-2’s power supply (or in an optional
battery cabinet). Secondary (battery) power is required to support the system during loss of primary power.
• Accessory power for peripheral devices. When the NCA-2 is not powered by the NFS2-640, TB6 can be used to supply +24 VDC
power to devices within the same enclosure as the NCA-2. If those devices have outputs, the outputs must be power-limited (Class
2).
3.12.2 Connecting the Power Supply
AMPS-24/E
Connect J13 Power on the NCA-2 to MAIN 24V connection on AMPS-24/E with Cable 75637 (see Figure 3.12). This cable is 20 feet
long, and must run in conduit between the backbox containing the fire alarm control panel and the backbox containing the AMPS-24/E.
See AMPS-24/E manual for full details and installation precautions.
In order to conserve batteries, connect AC power and check it before connecting batteries. Follow the procedures specified in the power
supply manual.
WARNING: REMOVE POWER SOURCES WHILE CONNECTING COMPONENTS
REMOVE ALL POWER SOURCES TO EQUIPMENT WHILE CONNECTING ELECTRICAL COMPONENTS. LEAVE THE
EXTERNAL, MAIN POWER BREAKER OFF UNTIL INSTALLATION OF THE ENTIRE SYSTEM IS COMPLETE.
WARNING: REMOVE ALL SOURCES OF POWER BEFORE SERVICE
SEVERAL SOURCES OF POWER CAN BE CONNECTED TO THE CONTROL PANEL. BEFORE SERVICING THE
CONTROL PANEL, DISCONNECT ALL SOURCES OF INPUT POWER INCLUDING THE BATTERY. WHILE ENERGIZED,
THE CONTROL PANEL AND ASSOCIATED EQUIPMENT CAN BE DAMAGED BY REMOVING AND/OR INSERTING
CARDS, MODULES, OR INTERCONNECTING CABLES.
NOTE: The NCA-2 ships with an insulator to prevent its lithium battery from discharging. To preserve the battery, this insulator should be
left in place as long as possible before applying AC power. Refer to “Memory-Backup Battery” on page 23. Some installers may find it
convenient to remove the insulator before mounting all equipment.
NOTE: If using multiple power supplies with one set of batteries, refer to main power supply manual for connection requirements.
NOTE: Use 0 (zero) ohm impedance when testing wire-to-wire faults.
3030-AMPS-24a.wmf
J13 on NCA-2
Cable 75637
Red
Black
Black
Red
AMPS-24
Main Power
Supply
Figure 3.12 DC Power Connections: Main Power Supply
Orange
Brown
Main 24V
To Next Page
Loading...
Need help?
General
