Document # 50079 Rev. D 05/23/97
Page
23
Current Calculations
1. When Using the 6.0 amps Maximum Current Available:
Five minutes under full load (6.0 amps current draw) requires 3.0 AH of a 7.0 AH
capacity battery. The remaining 4.0 AH capacity must support the FCPS during its
required standby time. Because of this, the standby current draw cannot exceed the
figures listed below:
1) For 24 hour standby time, the standby current draw cannot exceed 0.166 amps at 24
VDC (24 hours x 0.166A) = 3.984 AH
2) For 60 hour standby time, the standby current draw cannot exceed 0.066 amps at 24
VDC (60 hours x 0.066A) = 3.96 AH
3) Standby Current Calculation
Subtract total standby load calculated above from 0.166 amps for 24 hours standby or
0.066 amps for 60 hours standby. This figure should not be less than zero. If the amount
is less than zero, the required standby time will not be achieved.
2. When Using Less than 6.0 amps Maximum Current:
Use the following tables to determine the proper battery size.
3. When Battery Amp-Hour Requirements are for Greater than 7.0 AH:
Cut FCPS jumper JP1 to disable onboard battery charger and use an external battery
charger.
Table 5-2: Load in Alarm
@24VDC
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