32 • Alarm Indications Beacon 410 Gas Monitor Operator’s Manual
When the DC input voltage increases to 19.0 volts, the low DC power alarm is cleared and
the Beacon 410 will begin its warm-up sequence.
Responding to a low DC power condition
• If DC power is the primary power source:
1. For a temporary DC power source, disconnect primary DC power at the Beacon
410, then connect a 24 VDC battery.
2. Determine and correct the cause of primary DC power loss.
When the DC power source rises above 19.0 volts, the Beacon 410 begins the
warm up process.
3. Verify that the Beacon 410 enters normal operation after its warm-up sequence.
•If DC power is the backup power source:
1. If a non-rechargeable battery is used for backup, replace the battery.
2. Determine and correct the cause of primary AC power loss. When backup DC or
primary AC power is restored, the Beacon 410 begins the warm up process.
If the Beacon 410 was purchased with the battery charging feature, when AC
power is restored, the Beacon 410 charges the backup battery with a charge
current of approximately 100 mA 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 410 maintains the charge with the 100 mA
charge current.
3. Verify that the Beacon 410 enters normal operation after its warm-up sequence.
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