Operation Manual

11. Operation and performance
25
D SERIES Lake Operation Manual rev 3.0.4
11. Operation and performance
D SERIES Lake Operation Manual rev 3.0.3
25
11.3.7. Voltage Clip Limiter (VCL)
If current draw from the unit’s power supply is too high, the PSU’s regulation capability may be exceeded and
the internal voltage rails may drop and cause clipping. If this occurs, the VCL acts rapidly to prevent clipping on
the subsequent peaks. Limiting is performed by the ISVPL limite
Indication of this condition is shown on the output LEDs. Refer to Section 14.1 for more information on warnings
and faults.
11.3.8. Temperature Protection
D Series devices are equipped with a sophisticated temperature sensing system that provides protection
from 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 measurements in
operate continuousl y, with the highest possible output, and prevent shutting down. If temperature in any area
reaches a critical level, a warning is displayed. The warning is issued at approximately 80% of the maximum
allowable temperature. If the temperature continues to increase, a limiter (ATL or PTL) is engaged that limits signal
peaks to reduce further heat accumulation. Limiting is accomplished by gradual reduction of the ISVPL thresholds.
In the extreme case where the limiter cannot reduce heat accumulation and temperature reaches a
dangerous level, a fault is displayed and 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 output remaining muted. When the area has
cooled below the dangerous threshold, the fault condition is cleared and audio is restored.
11.3.8.1. Power Output Channels
A power output channel temperature warning or fault is indicated by the Amp LED for that channel and the Temp
LED for the frame.
• A warning is indicated by a static amber LED
•
• A fault is indicated with a static red LED
An event report is sent to the Lake Controller software for both the warning and the fault. If a temperature fault
condition arises on a power channel, the output of that channel will be muted.
NOTE: For Slimeline models, to optimize the CAL’s behavior when playing into a low
impedance load, manually set the desired ISVPL to reflect the real peak voltage
output to allow for a higher average current.