Lab.gruppen PLM series Operation Manual

Also see for PLM 10000Q: Supplementary guide User manual addendum Specifications Quick start Technical data

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Lab.gruppen PLM series Operation Manual Manual pdf 28 page image

22Operation and PerformancePLM Series Operation Manual rev 1.1.95.3.8 Temperature Protection5.3.8.1 OverviewPLM Series devices are equipped with a sophisticated temperature sensing system that provides protectionfrom overheating which may occur as a result of inadequate ventilation or excessive power output.Thermal measurements are made at several points within each power output channel along with measure-ments in the power supply and DSP areas. If temperature in any area reaches a critical level then a warningis displayed. If the temperature continues to increase and reaches a dangerous level then a fault is displayedand audio is muted. Each power output channel, the power supply and DSP area have separate indications.For all temperature faults, temperature monitoring will continue at 0.5 second intervals, with the outputremaining muted. When the area has cooled below the dangerous threshold, the fault condition is clearedand audio is restored.5.3.8.2 Power Output ChannelsA power output channel temperature warning or fault is indicated in one of the front panels LEDs (in theright-hand soft function buttons).▸ A warning is indicated by a static yellow LED and adjacent warning message: TEMP WARN:CH▸ A fault is indicated with a static red LED and adjacent warning message: TEMP FLT:CHIn either case, a report is also sent via the control network to the Lake Controller software. If a temperaturefault condition arises on a power channel, the output of that channel will be muted.5.3.8.3 Power Supply / DSPIf the power supply or DSP area overheats, the fault is indicated by a static red LED in the top left functionbutton; the adjacent on-screen text displays the fault message TEMP FLT:PSU or TEMP FLT:DSP respec-tively. In either case, a report is sent to the Lake Controller software. If a temperature fault condition ariseson the power supply or the DSP area, the output of all channel will be muted.5.3.8.4 PLM 20000QFor the PLM 20000Q a temperature dependant limiting feature is also present. At temperatures above thecritical warning level and below the dangerous fault level, the ISVPL threshold is slowly reduced to decreasethe output power and cool down the device. This enables the device to continue to pass audio, althoughwith a reduced amplitude, in extreme conditions. If reducing the ISVPL threshold does not cool down thedevice a temp fault will still be issued when the dangerous temperature level is reached.