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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).
Load in Standby
TABLE 5-2:
Device Type
Main Circuit Board
4XTMF
Remote Trouble Unit
2-wire Detector Heads
4-wire Detector Heads
Power Supervision Relays
Additional Current Draw
from TB1 (nonalarm)
Refer to the Device Compatibility Document for 2-wire smoke detector standby current.
1.
Must use compatible listed Power Supervision Relay.
2.
The total standby current must include the resettable power from TB1. Caution must be taken to ensure that
3.
current drawn from this output during alarm does not exceed maximum ratings specified (see Table 5-3 )
# of Devices
1
(1 max.)
(1 max.)
[
]
[
]
2
[
]
3
Sum Column for Standby Load
Document #50907
Current
(amps)
X
0.075
X
0.005
X
0.020
1
X
[
]
1
X
[
]
X
[
]
Rev. A1
12/03/02
P/N 50907:A1
Total Current
(amps)
=
0.075
=
=
=
=
=
=
=
amps
29
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