Lab.gruppen C Series 5:4X - Manual (Page 30)

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C Series C 20:8X, C 10:8X, C 10:4X and C 5:4X Operation Manual rev. 1.1.4
Operation and Performance
illumination of the Current Peak Limiter (CPL) LED on the front panel. The protection will sequence at six
second intervals to re-measure conditions. If the low-impedance fault is no longer detected, the amplifier will
un-mute.
If the CPL turns constant orange, the output is
muted, and the -4dB signal LED is ON, then the
amplifier 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-specified temperature
level is exceeded, give a high temperature warning. This warning condition is indicated by a flashing Temp LED
on the front-panel, and it is reported on the Device Control GUI via the NomadLink network.
As the amplifier approaches a thermal protection threshold, the warning LED sequence will start with short “on-
time” bursts. If the amplifier continues to overheat and approaches the temperature limit, the flashing sequence
will be defined 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 amplifier’s maximum current draw.
Soft-start
High powered amplifiers 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
amplifiers. The C Series amplifiers have very low inrush power as the capacitors are charged slowly and in a
controlled manner ensuring that breakers will not trip.