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Page 72

CDi DriveCore Series Operation Manual

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 2-16 Ohm limit (4-16 Ohm in Bridge Mono mode). If wiring and load are veriﬁed as correct and the fault condition

persists, see

"Service" on page 88 for servicing information.

The following faults are possible:

Fault Fault Type Description

HF Detect Channel Excessive high frequency signal content has been sensed at the output of the ampliﬁer.

DCLF Channel Excessive DC or low frequency signal content has been sensed at the output of the ampliﬁer.

Short Circuit Detect Channel A short is detected at the output of the ampliﬁer.

Thermal Channel/Power Supply

An amp channel and/or the power supply has exceeded the maximum acceptable temperature

threshold.

High Voltage Rail Power Supply

The power supply's high voltage rails are no longer within a safe operating range for the ampliﬁer

or other components attached.

Low Voltage Rail Power Supply

The power supply's low voltage rails are no longer within a safe operating range for the ampliﬁer

or other components attached.

AC Mains Power Supply The AC mains have reached an unsafe level.

Thermal Limit

If the ampliﬁer power supply and/or any channels become too hot for safe operation, a thermal fault will occur. If a channel's temperature reaches 80°

Celsius, a message will appear in the front panel display to indicate the onset of audio compression. 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 will shut off to protect itself above 100°

Celsius. The ampliﬁer will exit the thermal fault state only when the temperature drops back below the thermal limit.

NOTE: If the thermal limit is exceeded while the front panel LCD is asleep, the display will wake up to indicate that thermal limiting is occurring.

Auto-Insertion High-Pass Filters

A 35Hz, 24dB/Octave Butterworth high-pass ﬁlter is inserted automatically when a channel is conﬁgured for High Z operation. A 10Hz, 24dB/Octave

Butterworth high-pass ﬁlter is inserted automatically when a channel is conﬁgured for Low 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 safe operating levels.

Fan-Cooled Chassis

CDi DriveCore Series ampliﬁers are cooled by quiet, variable-speed fans. Maximum fan noise level of the CDi DriveCore ampliﬁer is 51dBA. The fans will

pull air from the front of the ampliﬁer to the rear.

The following fault conditions cause the fan to turn on full speed:

• High frequency fault (excessive high frequency signal content has been sensed at the output of the ampliﬁer)

• Thermal fault (excessive power supply or channel temperature is detected)

NOTE: After a fault, the fan will remain on at full speed until the fault is cleared.