L-Acoustics LA8 User Manual
Also see for LA8: Owner's manualOwner's manualUser manualUser manualMaintenance manual
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Contents
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LA 8_U M_E N_5 .0 w w w . l - a c o u s t i c s . c o m 4 1APPENDIX A: PROTECTION SYSTEMSThe LA8 electronic vital parts are continuously monitored by the embedded operating system to optimize the powerresources while ensuring safety even under extreme conditions. Each time a protection system is activated, a warningmessage blinks on screen and the L-NET LED also blinks in red.Remote monitoringIn LA NETWORK MANAGER the activation of a protection system is indicated by an Event Message (refer tothe LA NETWORK MANAGER video tutorial).MainsMains voltageThe LA8 amplified controller uses an auto-sensing SMPS (Switched Mode Power Supply) compatible with mains inputnominal voltages of 120 / 230 V ±10 % (LA8, LA8US) or 100/200 V ±10 % (LA8JP). The mains voltage is continuouslymonitored for under and over-voltage as well as for failure in alternating cycles.If the mains voltage reaches a value 30 % below nominal or 10 % above nominal,or if it skips about two cycles, the SMPS is switched off and the outputs are muted.The controller displays Waiting SMPS, see the figure on the right.A soft start sequence will automatically be engaged as soon as the mains voltagereturns to nominal state.If the mains voltage reaches a value between 30 % and 20 % below nominal, theoutputs are muted and the controller displays Fuseprotect, see the figure on theright.Normal operation will resume as soon as the mains voltage returns to nominal state.Mains currentThe SMPS is continuously monitored for current peaks and over-current.The average mains current can peak temporarily at values several times higher thanthe nominal value supported by the internal fuse of the controller.If the current peaks too frequently, the amplitude of the output signals areattenuated by 1 to 6 dB in order to prevent the SMPS fuse from blowing.The controller displays Fuseprotect, see the figure on the right.The protection will automatically be disengaged as soon as the mains current returnsto supported conditions.If an over-current is detected the SMPS is switched off and the controller displaysWaiting SMPS, see the figure on the right.A soft start sequence will automatically be engaged when the SMPS returns tonominal state. |
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