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LOOPSENSE EN54
INSTALLATION & COMMISSIONING
POWER SUPPLY & BATTERY CALCULATOR
Criteria
Example
Panel Configuration
Iq Calculation
Iq Calculation
No Off X mA
= Iq
No Off X mA
= Iq
Basic 1 Loop Panel
115
1
115
115
Basic 2 Loop Panel
135
Interface Cards/Boards
0
8 Way Sounder Board
8 Way Relay Board
8 Zone Conventional
SmartTerminal
12.4
1
12.4
12.4
Loop Devices
(using Loop calc)
0
L1 Iq
100
30
L2 Iq
Iq =
Iq =
157.4
Devices activating when the system is in alarm
L1 I alarm (max 500mA)
100
150
L2 I alarm (max 500mA)
Relays
10
20
200
Sounders
4
80
320
Total other Outputs mA
150
Ida=
Ida=
820
Devices de-activating when the system goes into alarm
Aircon Relays
2
20
40
Electric locks
4
100
400
Other
0
Idd=
Idd=
440
I Alarm ( Ia = Iq + Ida
– Idd ) = mA
Ia = 157.4 + 820
– 440 = 537.4
Criteria
Example
Battery capacity at end
of battery life
= ( Iq x 24 ) + ( Ia x 0.5 )
= ( Iq x 24 ) + ( Ia x 0.5 )
( rounded )
=
= ( 157mA x 24 ) + ( 537mA x 0.5 )
=
= 3768 + 269 = 4037 mA
Note:
1,000ma = 1Amp
= Ah
= 4.037 Ah
New battery capacity
requirement
= Ah x 1.25
= 3.329 x 1.25
= Ah
= 5.04625 Ah
Rounded up to nearest
available
Ah
7 Ah