page 49
DriveCore Install DA Series Operation Manual
System Protection
System Protection
Faults
The amplifier will enter a fault state if it senses an unsafe condition. This protection is for both internal and external faults. In addition, be sure that the load connected to the
amplifier is within the 2–16Ω limit (4–16Ω limit in bridge mono mode). If wiring is verified as correct and the fault condition persists, see
for servicing information.
Thermal Limit
If the amplifier becomes too hot for safe operation, the channel that is generating too much heat will be shut down until the temperature drops below the thermal limit. The
front-panel thermal indicator will illuminate at 80 degrees Celsius, indicating the onset of compression affecting the audio signal. The amplifier will continue to run in this
state until either the temperature is reduced to a safe operating range or, if the temperature continues to rise, the channel shuts off to protect itself above 98 degrees Celsius.
Auto-Insertion High-Pass Filters
A 35Hz high-pass filter is inserted automatically when an output channel is configured for high-Z operation.
AC Under/Over Voltage Protection
If the AC line voltage drops below 10% or rises above 10% of the nominal operating voltage of the amplifier, the amplifier’s power supply will turn off and the blue
Power
LED will flash. The amplifier will turn back on when the AC line voltage returns to a safe operating range.
Breaker
The DCi 4|1250DA and 8|600DA models use a resettable breaker. Please contact Crown Service for more information.
Fan-Cooled Chassis
DCi DA Series amplifiers are cooled by quiet, variable-speed fans. The maximum fan noise level of a DCi DA amplifier is 47 dBA. The fans will pull air from the front of the
amplifier to the rear of the amplifier.
The following fault conditions will cause the fan to turn on full speed:
• High-frequency fault
• DC fault
• Short-circuit fault
• Thermal fault
• Rail fault
NOTE:
After a fault, the fan will remain on at full speed for at least 60 seconds.
Universal Switching Power Supply
The DCi DA Series amplifiers incorporate a switching power supply designed for extremely high efficiency and high output power. The supply includes Power Factor
Correction (PFC), a Series Resonant Converter (SRC), and accepts AC supply voltages from ~100V to ~240V (±10%), 50/60Hz. Microprocessor-controlled diagnostic and
control capabilities both optimize performance and enhance long-term reliability.