Document #50907 Rev. A1 12/03/02 P/N 50907:A1 29
The Main Power Supply
5.1 The Main Power Supply
The FACP provides filtered power for operating the fire alarm control panel, external devices and the standby battery.
The power for operating external devices is limited. Use Table 5-2 (standby or nonalarm) and Table 5-3 (alarm) to
determine if external loading is within the capabilities of the power supply.
For 4-wire smoke detectors, be sure to power them from TB1 Terminals (+24V Resettable) and (-Ground).
1.
Refer to the Device Compatibility Document for 2-wire smoke detector standby current.
2.
Must use compatible listed Power Supervision Relay.
3.
The total standby current must include the resettable power from TB1. Caution must be taken to ensure that
current drawn from this output during alarm does not exceed maximum ratings specified (see Table 5-3 )
TABLE 5-2:
Load in Standby
Device Type # of Devices
Current
(amps)
Total Current
(amps)
Main Circuit Board 1 X 0.075 = 0.075
4XTMF (1 max.) X 0.005 =
Remote Trouble Unit (1 max.) X 0.020 =
2-wire Detector Heads [ ] X
[ ]
1
=
4-wire Detector Heads [ ] X
[ ]
1
=
Power Supervision Relays
2
[ ] X [ ] =
Additional Current Draw
from TB1 (nonalarm)
3
=
Sum Column for Standby Load = amps
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