Calculating The Battery Size - Fire-Lite MS-2 Instruction Manual
Fire alarm control panel
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Also See for MS-2:
- Owner's manual (21 pages) ,
- User manual (56 pages) ,
- User manual (56 pages)
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Power Supply Calculations
Table 5.3 contains three columns for calculating current draws. For each column, calculate the
current and enter the total (in amperes) in the bottom row. When finished, copy the totals from
Calculation Column 2 and Calculation Column 3 to Table 5.4 on page 49.
Calculation Column 1
Device Type
Primary, Non-Fire Alarm Current
Qty
Main Circuit Board
1
MS-2
or
MS-4
CAC-4
[
4XTMF
[
4XZMF
[
4XLMF/RZA-4XF
[
pair
1 pair max.
2-wire Detector
[
Heads
4-wire Detector
[
Heads
Power Supervision
[
**
Relays
††
NAC #1
NAC #2
Current Draw from
‡‡
TB1 (nonalarm
)
Sum each
***
column
for totals
* If using the Reverse Polarity Alarm output, add 0.005 amps; if using the Reverse Polarity Trouble output, add
another 0.005 amps.
† Refer to the Device Compatibility Document for standby current.
‡ Refer to the Device Compatibility Document for standby current.
** Must use compatible listed Power Supervision Relay.
†† Current limitation of Terminal TB2 circuits is 2.50 amps per NAC (MS-4 requires optional transformer for max.
current)
‡‡ The total standby current must include both the resettable (TB1 Terminals 3 & 4) and nonresettable for MS-4
only (TB1 Terminals 1 & 2) power. Caution must be taken to ensure that current drawn from these outputs
during alarm does not exceed maximum ratings specified. Current limitations of TB1, Terminals 1 & 2 = 0.500
amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10 mV
0.500 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10mV
*** Total current draw listed above cannot exceed 3.0 amps with only standard transformer installed or, for the MS-
4, 6.0 amps with both the standard and optional transformers installed.
5.4 Calculating the Battery Size
Use Table 5.4 to calculate the total Standby and Alarm load in ampere hours (AH). This total load
determines the battery size (in AH), required to support the control panel under the loss of AC
power. Complete Table 5.4 as follows:
48
(amps)
X[current
Total
draw]=
0.
X[0.080]=
X[0.085]=
]
X[0.001]=
]
X[0.005]=
]
X[0.004]=
]
X[0.004]=
†
]
X[
]
=
‡
]
X[
]
=
]
X[0.025]=
[
]=
Primary Non-Alarm =
Table 5.3 System Current Draw Calculations
Calculation Column 2
Primary, Fire Alarm Current
(amps)
X [current draw]
Qty
Total
=
1
*
X[0.112]
=
*
X[0.175]
=
[
]
X[0.001]=
*
[
]
X[0.011]
=
[
]
X[0.008]=
[
]
X[0.019]=
[
]
X[
]=
[
]
X[
]=
[
]
X[0.025]=
[
]
X[
]=
[
]
X[
]=
[
]=
Primary Alarm =
, nonresettable power and TB1, Terminals 3 & 4 =
RMS
, resettable power.
RMS
MS-2 & MS-4 Series Manual — P/N 51512:G2 10/18/2011
Calculating the Battery Size
Calculation Column 3
Secondary, Non-Fire Alarm
Current
(amps)
X[current
Qty
draw]=
0.
1
X[0.080]=
X[0.085]=
X[0.001]=
X[0.005]=
X[0.004]=
X[0.004]=
X[
]=
X[
]=
X[0.025]=
[
]=
Secondary Alarm =
Total
0.
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