Flex 402 & Flex 404 Instruction Manual — P/N 52194:D4 3/27/2015 45
Calculating the Battery Size 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 46.
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
Flex 402
or
Flex 404
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 (Flex 404 requires optional transformer for
max. current)
‡‡ The total standby current must include both the resettable (TB1 Terminals 3 & 4) and nonresettable for Flex 404
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 Flex
404, 6.0 amps with both the standard and optional transformers installed.
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