Section 12 – Power Requirements12-17Installing the Standby BatteryThe FOCUS 200 PLUS is shipped with a dual-battery harness that allows one or two batteries to beconnected to the control unit. The control unit cabinet can house up to 34.4AH batteries. The optional471961 (7187-202) Battery Enclosure may be used to house the batteries, if desired. Be sure to mark allbatteries with the date of installation.When connecting batteries in parallel, observe the following guidelines:• Use batteries from the same manufacturer and with the same voltage and capacity rating.• Use batteries with approximately the same age and state of charge.• Use the cables provided and observe polarity.• Replace all batteries at the same time, even if only one battery has become weak.Installing the Batteries in the Control Unit CabinetIf you are installing one or two batteries, perform the following steps:Step Action1 Make sure that the power is off.2 Mark batteries with the date of installation.3 Make connections as shown in the Summary of Connections diagram.Installing the Batteries in the Battery EnclosureIf you are installing the batteries in the 471961 Battery Enclosure, perform the following steps:Step Action1 Make sure that the power is off.2 Connect the knockouts between the control unit and the battery enclosure using thefurnished nipple.3 Remove the 4A fuse from the in-line fuse holder in the battery enclosure.4 Mark the batteries with the date of installation.5 Install the batteries, connect to the battery enclosure, and make all wiring connections.6 Replace the 4A fuse in the in-line holder.Battery SupervisionThe FOCUS 200 PLUS System provides three supervisory functions associated with the control unitbattery:• Process alarms with low battery option.• Integral battery cutoff relay.• Supervision of the battery leads.Process Alarms with Low Battery Option is a battery check made under load in each of three instances:• Every 24 hours.• When any BA group is turned off.• Any time that an AC fail condition occurs.The check consists of reducing the battery float charging voltage to cause the battery to power the loadfor 1 minute. If, during this time, the battery drops below approximately 12.0 volts:• A low-battery signal is sent to the CCC and a low-battery message is shown at the operatingpanels.
