IDA8 Global-Net User Manual196
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2. "REDUNDANCY SYNCHRONIZING": it will be shown when the system is being synchronized.
3. "STANDBY": it means the device is the "STANDBY" end.
3.4 Power Amplifier
3.4.1 SPA
The SPA (Security Power Amplifier) were specifically developed to meet the requirements of EN
60849 for safety installations. Each amplifier module is fitted with its own 220 VAC/24 VDC power
supply for increased system reliability. To avoid handling errors, the volume output is set using the
potentiometer located at the back of the apparatus. In addition to standard protection via fuses, SPA
amplifiers also have electronic and thermal protection to protect them from all potential hazards.
A fan provides forced cooling for the final power shelves and internal parts of the apparatus. It starts
up automatically when the temperature reaches a certain threshold, and stops when it returns to
normal values. Four LEDs display the status of each amplifier: AC or DC power supply, Line
Overload and Temperature overload. Furthermore, a three LEDs VU-Meter indicates the presence
and level of audio signal.
A surveillance circuit continuously monitors the temperature and the presence of AC and DC power
supplies for both amplifiers. In case of a problem, the overload LEDs will be switched ON and the
Fault relay will be activated. The SPA series (SPA 2060, 2120, 2240) can be ordered with optional
115V power supply.
3.4.1.1 Front Panel
VU Meter:
The VU-meter is composed of three LEDs that represent three different level thresholds: -40dB, -
20dB and 0dB. When the input signal reaches those thresholds, the corresponding LED will
blink.
Temp.:
If the device internal temperature exceeds 95 degrees C, the TEMP LED will light and the pre-
amp will stop working until the temperature falls below 95 degrees C. The pre-amp will come
back to a working state automatically. To avoid temperature failure, please insert an external fan
to the rack system.
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