SONAMP® 875D SE 8-CHANNEL AMPLIFIER
Protection Circuits
Thermal Protection
If the amplifier’s cooling vents are blocked, or it is installed with inadequate ventilation the amplifier may exceed its safe operating temperature. If the amplifier’s internal temperature exceeds 154°F (68°C) it will self-protect, and the following will occur:
•The audio output to all connected zones will shut OFF.
•The front-panel PROTECTION LEDs (see Figure 3) will illuminate yellow.
•An over-temp message will be sent via RS-232.
Once a safe temperature (<67°C) is reached, the Protection LEDs will all extinguish. You can then re-activate the amplifier, either by switching the front-panel Power button OFF and ON or by a ‘Power’ command if the amplifier is being serial controlled.
IMPORTANT: Before re-activating the amplifier, correct the problem that caused the over-temperature condition (volume set too high, inadequate ventilation, etc.)
PROTECTION
BBE ON
ACTIVE
Figure 3:
FRONT-PANEL
STATUS LEDs
NOTE: If you’re serial-controlling the 875D SE you can poll the amplifier at any time and its internal temperature will be reported to the control device .
Over-Current Protection
If an over-current condition occurs in a zone, that zone will shut OFF for 5 seconds and its PROTECTION LEDs will flash ON and OFF. The zone will then turn back ON. If the over-current condition continues the zone will shut OFF for 6 seconds, its PROTECTION LEDs will flash, then it will turn back ON. If the over-current condition continues this process will repeat, with the wait time increasing by 1 second each time. When the wait time reaches 10 seconds the zone will LOCK, the zone’s PROTECTION LEDs will continually illuminate and the amplifier must be powered OFF using the front-panel POWER button (or a serial command, if the amp is being controlled via RS-232). Before turning the amplifier ON again, correct whatever is causing the over - current condition in t he zone (speaker impedance too low, volume too high, short - circuit, etc . ) .
