Operation Manual
5. Operation and performance
C SERIES Operation Manual rev 2.0.0
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NOTE: If the CPL turns constant orange, the output is muted, and the -4dB 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.
5.6.6. Temperature protection
Thermal output points are shared by each channel pair. These indicators will, if the pre-specied temperature level
is exceeded, give a high temperature warning. This warning condition is indicated by a ashing Temp LED on the
front-panel, and it is reported on 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.
5.6.7. 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 by limiting the amplier’s maximum current draw.
Soft-start
High powered ampliers with inadequate inrush limiting can pull considerable current from the mains at turn-on.
This can result in unexpected tripping of fast-acting mains breakers. Such is not the case with C Series ampliers.
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.
Several ampliers will, under normal conditions, be able to be powered up simultaneously. If you do experience
problems powering up multiple ampliers simultaneously, use the NomadLink network and the NLB 60E to
establish a power sequence with a pre- set delay between each amplier’s start-up.