Battery Calculations
74
Document #15140 Rev.G 01/02/02 P/N 15140:G
A.1
The Main Power Supply
The MS-5024UD 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 A-2 (standby or nonalarm) and Table A-3
(alarm) to determine if external loading is within the capabilities of the power supply.
Concerning 4-wire smoke detectors: Be sure to power smoke detectors from TB4, Terminals 3 and 4.
TABLE A-2:
Filtered Load in Standby - external devices connected to TB4 only
Device Type
# of
Devices
Current
(Amps)
Total Current
(Amps)
Main Circuit Board
1
X
0.1
=
0.1
ADM-24
(1 max.)
X
0.006
=
RZA-5F
(1 max.)
X
0
=
0
RM-5F
(1 max.)
X
0
=
0
CAC-5F
(1 max.)
X
0
=
0
2-wire Smoke Detector
Heads
[ ]
X
[ ]
1
1. Refer to the Device Compatibility Document for 2-wire smoke detector standby current.
=
4-wire Smoke Detector
Heads
[ ]
X
[ ]
1
=
Power Supervision
2
Relays
2. Must use compatible listed power supervision relay.
[ ]
X
0.025
=
Current Draw from
TB4 (nonalarm)
3
3. The total standby current must include the sum of both the resettable (TB4, Terminals 3 & 4) and nonresettable (TB4,
Terminals 5 & 6) power. Caution must be taken to ensure that current drawn from these outputs during alarm does not
exceed maximum ratings specified (refer to Table A-3 )
=
Sum Column for Standby Load
=
Amps