Toa FS-7000 SERIES Installation - Manual (Page 61)

61
Storage battery capacity C (Ah) = [ K
1
I
1
+ K
2
( I
2
- I
1
) ]
Where,
C: Required storage battery capacity at 25°C
L: Maintenance rate* (generally 0.8)
K
1
: Capacity conversion time corresponding to the sum (T
1
+T
2
) of Waiting time T
1
and Operation time T
2
.
K
2
: Capacity conversion time corresponding to Operation time T
2
.
I
1
: Current consumption in standby mode from the time that power fails until emergency broadcasting begins.
This is the sum of all currents needed by the FS-7000EV, DS-029B, and other equipment consuming
power even during power failures.
I
2
: Power consumption during emergency broadcasts (the 24 V DC current consumption of the entire
system). When 4-wire system attenuators are connected, their current consumptions are also included.
*Maintenance rate is a correction value used to guarantee needed battery capacity and satisfy specified load
characteristics while accounting for variations caused by battery age and usage conditions. As a general
guideline, it is assumed that battery capacity decreased to 80% of the original represents the end of the
battery's useful life, and therefore a maintenance rate of 0.8 is used in these calculations.
Table 1. Battery Capacity Conversion Time Table
1
L
Capacity Conversion Time K (hours)
0.333
0.575
0.820
1.06
1.30
1.55
1.80
2.05
2.28
2.50
Discharge Time (minutes)
10
20
30
40
50
60
70
80
90
100
Current Consumption (A)
Operation
0.20
0.15
0.45
0.20
0.13
0.11
Model No.
FS-7000CP
FS-7010CP
FS-7000JP
FS-7000AT
FS-7000EV
FS-7000GM
Standby
0.00
0.00
0.00
0.00
0.01
0.00
Current Consumption (A)
Operation
0.06
0.09
0.015
0.07
0.05
Model No.
FS-7000RF
FS-7000RM
FS-7010RM
FS-7000PS
DS-029B
Standby
0.00
0.00
0.00
0.00
0.03
Confirm attenuator current consumption using the relevant specification sheets or manuals.
When capacity conversion coefficients corresponding to the operation time (discharge time) of more than 100
minutes is needed, approximate values can be obtained from the following expression:
Capacity conversion time K = 0.0217 x Discharge time + 0.33 ......... (A)
Table 2. Current Consumption During Power Failures