L-ACOUSTICS LA4X [43/47] Appendix a protection systems

LA4X_UM_EN_2.0 w w w . l - a c o u s t i c s . c o m 43

APPENDIX A: PROTECTION SYSTEMS

The LA4X electronic vital parts are continuously monitored by the embedded operating system to optimize the power

resources while ensuring safety even under extreme conditions. Each time a protection system is activated, a warning

message blinks on screen and the STATUS LED is also lit in red.

Remote monitoring

In LA NETWORK MANAGER the activation of a protection system is indicated by an Event Message (refer to

the LA NETWORK MANAGER video tutorial).

Output channel temperature

The fans associated to the heat sinks operate permanently, but as long as the temperature remains below 45 °C they

run at their slowest speed. Above 45 °C the speed is increased until it reaches its maximum value.

If a temperature of more than 60 °C is detected at output channel x, the signal

delivered at this output channel is attenuated and the controller displays High

Temperature, see the figure on the right.

If the temperature exceeds 65 °C, channel x is muted and the controller displays

Over Temperature, see the figure on the right.

In both cases the protection will automatically be disengaged when the

temperature returns to nominal state.

If one of the two fans is ineffective, the controller displays Fan blocked, see the

figure on the right.

The controller remains operational but there is a risk of temperature rising.

Output channel current

The output channels are continuously monitored for unexpected current values (error).

If an external error is detected at output channel x (typically due to a short-circuit

in a cable) this channel is muted and the controller displays Error, see the figure

on the right.

The channel will automatically be unmuted as soon as the issue is solved.

If an internal error is detected at output channel x (typically due to a cross-

conduct in the power stage) this channel is disabled and the controller displays

Error, see the figure on the right.

For safety reasons, the other channel in its pair (OUT 1/2 or OUT 3/4) is also

disabled.

The controller must be sent to an L-ACOUSTICS

representative for

maintenance.

Speakers

The L-DRIVE transducer protection system provides a dual analysis of both signal intensity and voltage in real time and

RMS. Under extreme conditions, when component membranes reach the over-excursion zone or if the coil ensemble

temperature reaches a critical point, L-DRIVE is activated and acts as a power regulator.

As a result, the amount of power delivered at any channel is adjusted to the dynamic and thermal capacity of eac h

individual transducer.