Lab.gruppen PLM 20K44 - Manual (Page 19)

5. Operation and performance
PLM+ SERIES Operation Manual rev 1.0.0
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Table 5.3 shows the theoretical maximum output power for a given load impedance and ISVPL setting.
Note: An ISVPL-to-load calculator that will assist in generating the appropriate ISVPL setting for a desired
power load is available at www.labgruppen.com/plm. The ratings shown in the table below are limited by the
CPL (Current Peak Limiter) functions, not by ISVPL settings, due to power output channel current capacity.
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 via the PLM+’s menu system. For further
details, please refer to section 7.11.2.5 of this manual, and also to the PLM+ Series chapter in the Lake Controller
User Manual.
PLM+ devices that have a smaller peak output voltage can still set the ISVPL threshold up to 600 V. When a
threshold is set above the maximum capability of a power output channel, the maximum ISVPL for that product will
be automatically set. Therefore, the ISVPL threshold can be in at the Module for the speaker’s maximum capability,
and the Module file remains cross-compatible with all PLM and PLM+ Series devices.
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.
CPL activity is indicated on the power output channel LED (embedded in the associated output channel’s function
button to the right of the LCD). Activity on an affected channel results in a flashing red indication together with a
CURRENT CLIP warning message displayed on the screen adjacent to the LED. A warning is also displayed on
the controlling PC via the network.