Testing the System Battery Checks and Maintenance68 NFS-640 Installation Manual P/N 51332:B1 12/01/2003 Return all circuits to their pretest condition. Check that all status LEDs are off and the green POWER LED is on. Notify fire, central station and/or building personnel when you finish testing the system.5.4 Battery Checks and MaintenanceMaintenance-free sealed lead-acid batteries used in the system do not require the addition of wateror electrolyte. These batteries are charged and maintained in a fully charged state by the mainpower supply's float charger during normal system operation. A discharged battery typicallycharges at 1.5–1.8 A and reaches the float voltage of 27.6 VDC within 48 hours.Follow the local AHJ and manufacturer recommendations for battery replacement intervals.Minimal replacement battery capacity appears on the control panel marking label. Immediatelyreplace a leaking or damaged battery. You can get replacement batteries from the manufacturer.• If a battery leaks and contact is made with the Sulfuric Acid, immediately flush skin and/oreyes with water for at least 15 minutes. Water and household baking soda provides a goodneutralizing solution for Sulfuric Acid.• If Sulfuric Acid gets into eyes, seek immediate medical attention.• Ensure proper handling of the battery to prevent short circuits.• Take care to avoid accidental shorting of the leads from uninsulated work benches, tools,bracelets, rings, and coins.On-board Memory-Backup BatteryA snap-in lithium battery on the CPU provides backup of the CPU’s on-board memory duringpower loss. The expected shelf-life for this battery is 10+ years. However if battery connections aredamaged or the battery does lose power, a system trouble message will appear: “Bat. BackupRAM”.! WARNING: Batteries contain Sulfuric Acid which can cause severe burns to the skin and eyesand damage to fabrics.! WARNING: Shorting the battery leads can damage the battery, equipment, and could causeinjury to personnel.
