NCA-2 Manual — P/N 52482:M5 03/20/2019 23
CHS-M3 Chassis Installation
Mounting Chassis in Backbox
Align chassis-mounting slots with chassis-mounting studs (see Figure 3.1 and Figure 3.5 for locations). Secure with nut & lock-washer
provided with chassis.
3.5.3 Memory-Backup Battery
The lithium battery on the CPU provides backup of the NCA-2’s on-board
memory during power loss. The NCA-2 ships with an insulator to prevent
the battery from discharging. To preserve the battery, the insulating tube
should be left in place as long as possible before applying AC power.
If the insulator is not removed before applying AC power, the control
panel will show a trouble situation.
This battery’s shelf-life should exceed 10 years, but if for some reason it
fails, the control panel will show a trouble when powered up. To replace
the lithium battery (P/N 31004, RAYOVAC Lithium 3V BR 22335):
1. Make a full backup of all system settings to prevent loss of all
programming data.
2. Disconnect all power sources.
3. Disconnect wiring and remove NCA-2 from backbox (3 screws at top, lift board tabs out of slot) and remove keypad (4 screws on
back, LCD display stays attached).
4. Remove battery from under clip (use fingers, because screwdriver could damage components) and insert new battery.
5. Replace keyboard, reinstall NCA-2 into chassis, and reconnect wiring.
6. Follow system power-up procedures.
7. Dispose of used battery promptly. Keep away from children. Do not disassemble and do not dispose of in fire.
1-15/16” (4.92 cm) aluminum
male/female 4-40 standoffs at
positions indicated
CHS-M3.wmf
NCA-2 mounting
slots
Chassis-mounting slots
Figure 3.5 Standoffs on Chassis CHS-M3
CAUTION: MOUNTING CONSIDERATIONS
IT IS CRITICAL THAT ALL MOUNTING HOLES OF THE NCA-2 ARE SECURED WITH A SCREW OR STAND-OFF TO
INSURE CONTINUITY OF EARTH GROUND.
Lift clip gently while
removing battery
Dotted line indicates
location of insulator
3030-lithium.cdr
CAUTION: BATTERY CONSIDERATIONS
THE BATTERY USED IN THIS DEVICE MAY PRESENT A RISK OF FIRE OR CHEMICAL BURN IF MISTREATED.
DO NOT RECHARGE, DISASSEMBLE, HEAT ABOVE 212°F (100°C), OR INCINERATE. REPLACE BATTERY WITH
NOTIFIER P/N 31004 ONLY. USE OF ANOTHER BATTERY MAY PRESENT A RISK OF FIRE OR EXPLOSION.
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