Operation Manual
5. Operation and performance
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C SERIES Operation Manual rev 3.0.0
at six second intervals to re-measure conditions. If the low-impedance fault is no longer detected, the amplier will
un-mute.
NOTE: If the CPL turns constant orange, the output is muted, and the -4 dB signal LED is ON, then
the amplier has gone into maximum current protection. This situation is caused by an excessive input
signal and is not due to a short circuit. Turn down the input signal to avoid or remedy this situation.
5.5.7. Temperature protection
Thermal measurement points are provided on each output channel as well as on the power supply. If these
sensors detect temperatures above the specied maximums, a high temperature warning will be indicated by
a ashing Temp LED on the front panel. The warning also will be transmitted to the Device Control GUI via the
NomadLink network.
As the amplier approaches a thermal protection threshold, the warning LED sequence will start with short “on-
time” bursts. If the amplier continues to overheat and approaches the temperature limit, the ashing sequence will
be dened by longer and longer on-time bursts until the protection mode is activated.
If the temperature becomes too high to continue safe operation, the overheated output channel(s) will be muted
until the temperature returns to an acceptable level.
Fully active temperature protection (with muting) is indicated by a constantly illuminated Temp LED. It will also be
indicated as a fault via the NomadLink network on the DeviceControl GUI.
Temperature measurements will continue at six second intervals. The output will un-mute when the channel or
power supply returns to a safe operating temperature.
5.5.8. Power Average Limiter (PAL)
The Power Average Limiter (PAL) controls the current-drawing relationship between the power supply and the
mains inlet. PAL limits the maximum average power consumption according to the power supply capabilities,
ensuring that the PSU will not overload. In addition, in the larger models that potentially could pull more current
from the mains than the mains fuses are specied to handle (more than 16 A), PAL limits the amplier’s maximum
current draw to prevent blowing the mains fuse.
5.5.9. Soft-Start
High powered ampliers with inadequate inrush limiting can pull considerable current from the mains at turn-
on. This can result in fast acting mains breakers tripping. Such is not the case with C Series ampliers in most
circumstances.. The C Series ampliers have very low inrush power as the capacitors are charged slowly, and in a
controlled manner, ensuring that breakers will not trip.