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EXPro Installation Manual
BATTERY CALCULATION
DEVICE CURRENT CONSUMPTION
EXPRO PANEL IN VARIOUS STATES
State
Mains fail, Buzzer silenced
Mains fail, Buzzer active
st
Mains failed, 1
Stage Alarm
nd
Mains failed, 2
Stage Alarm
Bottle released, Gas fired
EXPANSION BOARDS
Option
For each activated relay
3-relay expansion board (Standard)
8-relay expansion board (Optional)
EXTERNAL DEVICES
Item
Optical
Heat
Maxitone Sounder
DETERMINING BATTERY SIZE
To calculate the required battery backup capacity, we use the equation:-
Minimum battery Size = 1.25 x [(T
Where:
T
= Minimum time in hours required for the alarm [½ hour is most common time]
ALM
I
=
Total alarm current in amps for all devices connected to the alarm circuits
ALM
T
=
Standby time in hours for the system after mains failure [normally 24, 48 or 72 hr]
SBY
I
=
Quiescent current in amps of control panel in fault condition [because of mains
SBY
failure].
T
= Minimum time in hours required for the bottle output
BOT
I
=
Total current drawn by equipment connected to the bottle output
BOT
Approved Document No: GLT-212-7-1
Issue: 1.7 Author: MF/NRPJ Date: 05/07/2021
www.acornfiresecurity.com
Current Consumption
52mA
57mA
110mA
150mA
167mA
Quiescent
100uA
50uA
0mA
x I
) + (T
x I
ALM
ALM
SBY
www.acornfiresecurity.com
Current Consumption
12mA
40mA Max
100mA Max
Alarm
35mA
35mA
25mA
) + (T
x I
)]
SBY
BOT
BOT
Page 26
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