LD Systems IPA 412 T Bedienungsanleitung Seite 10

CHANNEL STATUS LEDs for CHANNELS 1-4
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PROT (Protect) - The Protect LED displays different operating states. Details are provided in the table below.
LED status
Protect off
Protect is blinking slowly
(approx. 2Hz)
Protect is blinking quickly
(approx. 8Hz)
Protect permanently lit
The last Protect status is stored by the device. If the device is restarted, the last protect status of the respective channel/amplifier module is always
displayed during the restart and then deleted.
LIMIT - The LED lights up when the corresponding channel is operated in the upper limit range. Brief flashing of the LED is not critical. To protect the
system, an excessive signal level is gently reduced by the integrated limiter. If the limiter LED lights up longer or continuously, reduce the volume level.
SIG - The LED lights up when there is an audio signal on the corresponding channel.
MUTE SYMBOL CHANNEL 1 - 4
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The mute symbol lights up when the level control of the corresponding channel is turned fully counter-clockwise
corresponding channel is muted via the Ethernet expansion card.
BRIDGE LED CHANNEL 1/2 AND CHANNEL 3/4
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The bridge LED of a channel pair lights up as soon as the channel bridge mode is activated for the corresponding channels (see point 5).
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Description
The amplifier module for the
corresponding channel functions normally.
The device has detected a high
temperature on the power supply or the
amplifier board. The speaker module
functions normally. The integrated
temperature limiter reduces the device's
output power in order to prevent the
device from overheating. This status is
generally displayed on all channels. As
soon as the temperature falls again, the
device switches to normal operation.
The amplifier module for the
corresponding channel has detected a
fault. To protect the amplifier module and
the connected speaker, it is switched to
mute. As soon as the fault disappears, the
amplifier module switches back to normal
operation.
The device has encountered a fatal fault.
To protect the device and connected
speaker, the device is switched to standby.
This status is generally displayed on all
channels.
Possible causes
Concealed ventilation slots, dusty fans, long-
term operation under high load, operation at
very hot ambient temperatures, operation in
racks without airflow.
Short circuit of the amplifier output, operation
when the output impedance is too low, high-
frequency signal at the output, *power supply
overcurrent, *power supply fault
*In the case of power supply faults, the status
is displayed on all channels
Power supply overtemperature, amplifier
board overtemperature, DC voltage signal at
the output, DSP error.
Turn off the device and allow it to cool.
Disconnect all input and output cables and
turn on the device. If the fault is still displayed
after the system starts, please contact an
authorised service centre.
-∞
(channel is muted), or the