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5. Electrical Ratings and Current Calculations
Calculating Standby and Alarm Currents
The LDM series annunciators draw their power from the Fire Alarm Control
Panel and must be considered when calculating primary and secondary power
requirements. Refer to the installation manual for the particular control panel
employed for the calculation of power requirements for the entire system.
1. Enter Standby Total obtained here into the standby calculation tables of
the installation manual.
2. Enter Alarm Current Total obtained here into the alarm calculation tables
of the installation manual.
Standby Current
Number of LDM-32F Modules
Number of LDM-E32F Expanders
Alarm Current
Number of LDM-32F Modules
Number of LDM-E32F Expander
Number of LEDs
Number of LEDs
1. The 0.040 amps can be reduced to 0.030 for modules with Piezo disable or Flash Inhibit selected.
2. Use this line for calculations if LEDs are powered from 24 VDC source.
3. Use this line for calculations if LEDs are powered from the 5 VDC source from J1 on the LDM-32F.
32
[
[
Standby Total =
[
[
2
[
3
[
Alarm Current Total =
Table 3 Power Requirement Calculations
Calculating Standby and
]
X 40 mA
]
X 2 mA =
]
X 56 mA =
]
X 18 mA =
]
X [
]mA per LED=
]
X
[(
)mA/3]=
1
=
[
] amps
[
] amps
LDM-32F PN 50055:C 03/20/01
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