RKI Instruments Beacon 800 - Manual (Page 24)

21 • Alarm Indications Beacon 800 Gas Monitor Operator’s Manual
NOTE: When a 24 VDC battery is used as a backup power source, the Beacon 800
keeps the battery charged by providing a trickle charge from the AC power
source. If AC power is interrupted, the Beacon 800 will operate from the DC
backup battery until the battery voltage drops to 21.5 volts or less.
Low Battery Condition Indications
The Beacon 800 senses a low battery condition when:
• AC power is disconnected, misconnected, or interrupted
AND
• the DC power source is 21.5 volts or less.
When the Beacon 800 senses a low battery condition, it alerts you as follows:
• the FAIL light turns on;
• the top screen displays the SUPPLY VOLTAGE IS TOO LOW message;
• the bottom screen displays the -LOW POWER STANDBY- message and actual
voltage of incoming DC power.
Responding to a Low Battery Condition
This section suggests responses to a low battery condition.
• If DC power is the primary power source:
1. For a temporary DC power source, disconnect primary DC power at the Beacon
800, then connect a 24 VDC backup battery;
2. Determine and correct the cause of primary DC power loss.
When the DC power source rises above 22.0 volts, the Beacon 800 begins the warm
up process.
• If DC power is the backup power source:
1. Replace or recharge the 24 VDC backup battery to resume backup power
capability;
2. Determine and correct the cause of primary AC power loss.
When backup DC or primary AC power is restored, the Beacon 800 begins the warm
up process. When AC power is restored, the Beacon 800 charges the battery until it is
fully recharged. Charge time varies depending on the battery size and how much the
battery was depleted. Once the battery is fully charged, the Beacon 800 reverts to a
trickle charge to maintain the battery charge.