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2.6 Loading Calculations
2.6.1 Panel Loading
The Total Panel Load must not exceed the rating of the power supply. The power supply can deliver a 2A total
load maximum.
The panel loading includes the panel itself (70/125mA), any power required for additional option modules and all
external power required for the Input, Output and AUX circuits.
The backlight is turned off during AC supply failure (after 60 seconds). It turns on in Alarm or if the panel keys
are pressed.
2.6.2 Battery Standby Calculation
Quiescent Load
Fire Alarm Load
Equipment
I (A)
x
Total
I (A)
x
Total
EX-3001 Panel
0.070
11
1.0
= 0.070
0.125
12
1.0
= 0.125
Exp-008
0.000
1.0
=
0.065
13
1.0
=
AUX #1 Supply Output
14
1.0
=
1.0
=
AUX #2 Supply Output
1.0
=
1.0
=
Sounder Output 1
15
1.0
=
Sounder Output 2
1.0
=
Sounder Output 3
1.0
=
Actuator Output
1.0
=
Total
Quiescent Load
=
Alarm Load
=
x 24 hr =
Ahr
x 72 hr =
Ahr
2
16
x 0.5 hr =
Ahr
(carry forward) +
Ahr
Total Load (Qui Alarm) =
Ahr
x 1.25
(Battery De-rating factor) =
Ahr
11
Figure quoted is for mains fail condition (backlight off)
– add 15mA for first hour of fault when the backlight is on.
12
Figure quoted is for fire in mains fail condition
– with Relay1, Relay 2 & Fire relay energised (backlight on).
13
Figure quoted is for all relays on. 8mA per relay output on.
14
Maximum 0.5A load per AUX. Calculate the required load for each auxiliary output in both the quiescent and alarm conditions. Refer to
the technical information for each device that is to be powered from the panel AUX Output to determine the overall AUX loading currents.
The sum of all these additional currents should be entered in these fields.
15
Maximum 1.0A load per Sounder.
16
The alarm load should be doubled to allow for changes in battery efficiency for loads in excess of the recommended C/20 discharge rate.
The total load calculated should be multiplied by a de-rating factor of 1.25 to allow for changes in battery efficiency over time. The above
calculation is in accordance with the recommendations in BS5839-1: 2002.