66
NFS2-640/E Installation Manual —
P/N 52741:P2 7/10/14
Power Supply Calculations
Calculating the System Current Draws
A.2.1 Calculating the Maximum Secondary Power Fire Alarm
Current Draw
Use Table A.3 below to determine the maximum current requirements of secondary power source
during fire alarm conditions. The result obtained is the amount of current that the batteries must be
able to supply to the fire alarm system. Use the result in Table A.4 to determine the size of the
batteries needed for the fire alarm system.
Category
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
CPU2-640/E
# NACs in use (0, 1, 2, 3 or 4)
*
CPS-24/E
KDM-R2 (Backlight on)
LEM-320
1
[ ]
n/a
[ ]
0 / 1
x [0.250] =
x [0.035]
n/a
x [0.100]=
x [0.100]=
1
[ ]
n/a
[ ]
0 / 1
x [0.250] =
x [0.035]
n/a
x [0.100]=
x [0.100]=
1
[ ]
n/a
[ ]
0 / 1
x [0.250] =
x [0.035]
x [0.040]
x [0.100]=
x [0.100]=
SLC loop
†
:
1/2
x [.200]=
1/2
x [.200]=
1/2
x [.200]=
NCA, NCA-2 (Back light ON)
NCA, NCA-2 (Back light OFF)
NCM-W, NCM-F
HS-NCM-W/MF/SF/WMF/WSF/MFSF
TM-4
DPI-232 (Refer to manual**)
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
x [0.400]=
x [0.200]=
x [0.110]=
x [0.400]=
x [0.110]=
x [
]=
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
x [0.400]=
x [0.200]=
x [0.110]=
x [0.400]=
x [0.175]=
x [
]=
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
x [0.400]=
x [0.200]=
x [0.110]=
x [0.400]=
x [0.110]=
x [
]=
APS-6R
APS2-6R
ACPS-2406, ACPS-610
[ ]
[ ]
x [0.025]=
x [0.0013]=
DVC components (Refer to manual**)
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
AA-30
AA-100, AA-120
[ ]
[ ]
x [0.045]=
x [0.050]=
ACM-24AT
ACM-48A
AEM-24AT
AEM-48A
[ ]
[ ]
[ ]
[ ]
x [0.016]=
x [0.016]=
x [0.002]=
x [0.002]=
[ ]
[ ]
[ ]
[ ]
x [0.070]=
x [0.070]=
x [0.056]=
x [0.056]=
[ ]
[ ]
[ ]
[ ]
x [0.016]=
x [0.016]=
x [0.002]=
x [0.002]=
Maximum number of LEDs illuminated on
these annunciators during non-fire
conditions:
[ ]
x [0.0054]=
[ ]
x [0.0054]=
AFM-16AT, AFM-32A
ACM-16AT, ACM-32A
AEM-16AT, AEM-32A
[ ]
[ ]
[ ]
x [0.040]=
x [0.040]=
x [0.002]=
[ ]
[ ]
[ ]
x [0.056]=
x [0.056]=
x [0.018]=
[ ]
[ ]
[ ]
x [0.040]=
x [0.040]=
x [0.002]=
AFM-16A
ACM-8R (refer to manual**)
LDM (refer to manual**)
FDU-80 LCD-80, LCD2-80
[ ]
[ ]
[ ]
[ ]
[ ]
x [0.025]=
x [
]=
x [
]=
x [0.0643]=
x [0.100]=
[ ]
[ ]
[ ]
[ ]
x [0.065]=
x [
]=
x [
]=
x [0.0643]=
x [0.100]=
[ ]
[ ]
[ ]
[ ]
x [0.025]=
x [
]=
x [
]=
x [0.0643]=
x [0.050]=
AMG-1, AMG-E
RM-1
[ ]
[ ]
x [0.060]=
x [0.020]=
[ ]
[ ]
x [0.060]=
x [0.020]=
[ ]
[ ]
x [0.060]=
x [0.020]=
FZM-1, MMX-2
[ ]
x [0.0094]=
[ ]
x [0.090]=
[ ]
x [0.0094]=
RPT-W, RPT-WF, RPT-F
RPT-485W, RPT-485WF
[ ]
x [0.017]=
[ ]
x [0.017]=
[ ]
x [0.017]=
UDACT Communicator
UDACT-2 Communicator
NFV-25/50 (see manual**)
[ ]
[ ]
[ ]
x [0.040]=
x [0.052]=
x [
]=
[ ]
[ ]
x [0.100]=
x [0.087]=
x [
]=
[ ]
[ ]
x [0.040]=
x [0.052]=
x [
]=
Four-Wire Smoke Detectors
‡
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
Power Supervision Relay
EOLR-1
[ ]
x [0.020]=
[ ]
x [0.020]=
[ ]
x [0.020]=
FWSG (only if powered by the FWSG 24V
connections TB:A2 and TB:A3)
[ ]
x [0.040]=
[ ]
x [0.040]=
[ ]
x [0.040]=
Notification Appliance powered from Main
Power Supply
**
[ ]
[ ]
x [
]=
x [
]=
DHX-501, FSD-751RP, FSD-751RPL
(Duct Detectors with internal relays)
Refer to installation document
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
CHG-120 Battery Charger
[ ]
x [0.060]=
Local Energy Municipal Box
[ ]
x [
]=
Compatible Devices not listed above
††
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
[ ]
[ ]
x [
]=
x [
]=
Sum each column for totals
Primary, non-alarm:
Primary, alarm:
Secondary, non-alarm:
Table A.2 System Draw Current Calculations
*
Maximum current draw for all NACs plus DC output from TB10 and TB2 is 3.0 A during standby.
†
Value represents an SLC’s maximum current draw. Refer to device datasheets for individual current draws.
‡
The total regulated load current supplied to four-wire smoke detector and power supervision relays cannot exceed 1.25 A.
**
Enter the total notification appliance draw from the Main Power Supply, excluding the current from APS-6R supplies. Refer to Device Compatibility Document.
†† Refer to manual and/or Device Compatibility Document. See Table 1.1, “Reference Documentation,” on page 8 for specific documentation part numbers.
