Lab.gruppen PLM 20K44, Operation Manual

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Lake-enabled amplifier devices (D Series Lake, PLM+, PLM) that have a smaller peak output voltage capability still
allow ISVPL speaker threshold settings up to 600 V. When a threshold is set above the current maximum capability
of a power output channel, the actual ISVPL will automatically be set to the maximum ISVPL for that channel.
channel and displayed in [ ]. Therefore, the ISPVL threshold can be set at the Module for the speakers’s maximum
capability, and the Module file remains cross-compatible with all Lake-enabled amplifier devices.
5. Operation and performance
PLM+ SERIES Operation Manual rev 3.0.1
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Table 5.3 shows the theoretical maximum output power for a given load impedance and ISVPL setting.
Max. Sinewave Burst Power (Watts)
L Load Impedance (ohms) 2 2.67 4 8 16
L
ISVPL SETTING (V peak)
194 4489 5993 4705 2352 1176
193 4489 5993 4656 2328 1164
181 4489 5993 4095 2048 1024
167 4489 5223 3486 1743 872
153 4489 4384 2926 1463 732
121 3660 2742 1830 915 458
101 2550 1910 1275 638 319
83 1722 1290 861 431 215
70 1225 918 613 306 153
56 784 587 392 196 98
47 552 414 276 138 69
38 361 270 181 90 45
17.8 79 59 40 20 10
Table 5.3: ISVPL–to–output examples
The ISVPL threshold may be set at any level between 17.8 V and 600 V in the Lake Controller software. For further
details, please refer to the Lake Controller User Manual.
5.3.2. Current Peak Limiter (CPL)
The output Current Peak Limiter (CPL) ensures that the power output section will not be damaged by forcing it to
deliver current levels at the outputs that exceed the maximum current ratings of the output transistors. The CPL
keeps the output transistors within their Safe Operating Area (SOA). The CPL is non–adjustable.
This condition indicates an attempt to draw excessive current at the output. The output is attenuated until the
output current falls below the maximum current rating. Limiting is performed by the ISVPL limiter in conjunction
CPL activity is shown by red indication on the Power channel LED of the affected output channel and a
corresponding text description on the front panel in Lake Controller and CAFÉ software programs.
Refer to section 9.1 for more information on warnings and faults.
NOTE: If excessive current is indicated, check the output cables and examine the loudspeaker. If
impedance appears normal, you may rectify the condition by altering the ISVPL settings or lowering
input levels. CPL indication can be triggered by excessively low output impedance, possibly the result
of too many loudspeaker cabinets connected in parallel.