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Battery Power
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Siemens Industry, Inc.
Building Technologies Division
To ensure that the PSC-12 power supply is not overloaded, use the form and follow
the procedure listed below.
1.
Enter the quantity of each card/module in the enclosure.
2.
Calculate both the 24VDC and 6.2VDC loads for each row.
3.
Total the Active 24VDC and Active 6.2VDC columns.
4.
Ensure that both totals are within the power supply output ratings.
Make sure that the battery circuit breaker is in the OFF position.
Use either 14 or 12 AWG for battery connection.
Battery backup is required for compliance to UL864. The PSC-12 can charge a battery
up to 100 amp hours. (15 amp hours is the minimum size for the PSC-12.) To deter-
mine the battery size, use the form and follow the procedure listed below.
To determine the battery size, add current supplied to all devices connected to
PSX-12 Power Supply Extenders.
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1.
Record quantities of all required cards and modules.
2.
Calculate each row across and place the total in the last column: Total
Standby 24VDC Module Current.
3.
Total the last column and record it at the bottom of the form in the space
labeled Total System Current.
4.
For NFPA 72 Proprietary and UL 1076 systems, multiply the total system
current by 24 and record it at that Total AH location.
5.
Multiply the AH Total by 1.3 to obtain the final battery amp hour capacity and
record it opposite Battery Size.
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P/N 315-099321-7
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