Fire-Lite MS-4E Fire Alarm Control Panel - Manual (Page 48)

48 MS-2 & MS-4 Series Manual — P/N 51512:G2 10/18/2011
Power Supply Calculations Calculating the Battery Size
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.
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:
Device Type
Calculation Column 1
Primary, Non-Fire Alarm Current
(amps)
Calculation Column 2
Primary, Fire Alarm Current
(amps)
Calculation Column 3
Secondary, Non-Fire Alarm
Current
(amps)
Qty
X[current
draw]=
Total Qty
X [current draw]
=
Total Qty
X[current
draw]=
Total
Main Circuit Board
MS-2
or
MS-4
1
X[0.080]=
X[0.085]=
0. 1
X[0.112] * =
X[0.175] * =
0. 1
X[0.080]=
X[0.085]=
0.
CAC-4 [ ] X[0.001]= [ ] X[0.001]= X[0.001]=
4XTMF [ ] X[0.005]= [ ] X[0.011] * = X[0.005]=
4XZMF [ ] X[0.004]= [ ] X[0.008]= X[0.004]=
4XLMF/RZA-4XF
pair
[ ]
1 pair max.
X[0.004]= [ ] X[0.019]= X[0.004]=
2-wire Detector
Heads
[ ] X[ ] † = [ ] X[ ]= X[ ]=
4-wire Detector
Heads
[ ] X[ ] ‡ = [ ] X[ ]= X[ ]=
Power Supervision
Relays **
[ ] X[0.025]= [ ] X[0.025]= X[0.025]=
NAC #1 †† [ ] X[ ]=
NAC #2 [ ] X[ ]=
Current Draw from
TB1 (nonalarm ‡‡ )
[ ]= [ ]= [ ]=
Sum each
column *** for totals
Primary Non-Alarm = Primary Alarm = Secondary Alarm =
Table 5.3 System Current Draw Calculations
* 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
RMS
, nonresettable power and TB1, Terminals 3 & 4 =
0.500 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10mV
RMS
, resettable power.
*** 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.