Toa FS-7000 SERIES Installation - Manual (Page 60)

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6.15. Power Failure Backup
If broadcasts need to continue even during power failures, power must be supplied from an uninterruptible
power supply system (UPS) or emergency power supply unit.
6.15.1. Providing Backup Power Using an Uninterruptible Power Supply (UPS) System
Using a UPS as a backup power source permits both emergency and general-purpose broadcasts to continue
without interruption even if the main power source fails.
Procure a UPS that meets the following requirements and use it to supply AC power to equipment like the FS-
7000PS, FS-70006PA and FS-7012PA that must operate continuously even during power failures. If the UPS
does not meet the following requirements, it may shorten the amount of time that backup power can operate
and/or may prevent continued broadcasts. Therefore, it is important that the UPS selected meets the
necessary requirements.
[UPS Requirements]
• Switching time: Under 10 ms
• Capacity (W) is larger than the total capacity (W) of equipment being backed up.
• Capacity (VA) is larger than the total capacity (VA) of equipment being backed up.
• Backup time, calculated from the total capacity (W and VA), is over twice as long as the desired backup
time.
• Output wave should be a sine wave.
6.15.2. Power Backup Using the DS-029B Emergency Power Supply Panel
When the DS-029B is being used for power backup, emergency broadcasts can still be made even during
power failures, but general-purpose broadcasts become unavailable. Only equipment other than the FS-
7006PA and FS-7012PA can be backed up using the emergency power supply unit. Therefore, power
amplifiers that operate on 24 V DC power must be used, or a UPS must be prepared for the FS-7006PA and
FS-7012PA.
[Storage Battery Capacity Calculation]
The method for calculating the battery capacity of the emergency power supply unit needed to ensure
sufficient power backup is described below.
0
T 1
I 1
I 2
T 2
Discharge current I (A)
Time T (min)
The Storage battery capacity C required to operate for a fixed period of time (T
2
) after waiting for a fixed
period of time (T
1
) can be calculated as follows. Select a battery with the capacity larger than the calculation
result. Using Table 1 (Battery capacity conversation time) or Approximate expression (A), determine Capacity
conversion time K corresponding to Discharge time T, then calculate the required battery capacity using the
equation on the next page. Also, use Table 2 (Current consumption during power failures) to determine the
current consumption during standby or operation.