EQUIPMENT: FIRECLASS DUO-CEL
PUBLICATION: OM_DUO-CEL_APP
ISSUE No. & DATE: 2 20/06/18
PAGE 40 of 46
15.5 Power Supply Load Calculation
The power supply load must not exceed 1.5 Amps.
To determine the maximum power supply load perform the following steps:
1. Look-up the mains failed panel load in alarm. Enter this value as I
panel
.
2. Calculate the maximum load on the alarm circuits in mA in an alarm condition. Enter this value
as I
alarms
.
3. Calculate the load on the auxiliary supply in mA in an alarm condition. Enter this value as I
aux
.
4. Calculate the maximum power supply load using the formula below:
(I
panel
+ I
aux
+ I
alarms
)/1000 Amps
Warning:
The value of I
pse
must not exceed the maximum permissible load for the panel. Overloading
the power supply may result in automatic shutdown of the power supply during a fire alarm
condition.
15.6 Minimum Standby Battery Capacity Calculation
This section describes how to calculate the minimum required standby battery capacity for the control
panel. To determine the battery capacity, perform the following steps:
1. Look-up the mains failed fault battery current. Add the zone current for each zone (detectors,
sounders & EOL). Enter this value as I
panelfault
.
2. Look-up the mains failed alarm battery current. Add the zone current for each zone (detectors,
sounders & EOL). Enter this value as I
panelalarm
.
3. Calculate the maximum load on the alarm circuits in mA in an alarm condition. Enter this value
as I
alarms
and enter this figure in the table.
4. Calculate the load on the auxiliary supply in mA in the quiescent condition. Enter this value as
I
auxfault
.
5. Calculate the load on the auxiliary supply in mA in an alarm condition. Enter this value as
I
auxalarm
.
6. Calculate the total battery load in fault, I
fault
.
7. Calculate the total battery load in alarm, I
alarm
.
8. Enter the required standby time in hours, T
fault
.
9. Enter the required time in alarm in hours, T
alarm
.
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