Tesira Operation Manual

11. Operation and performance
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D SERIES Tesira Operation Manual rev 1.0.0
11.3.3. Power Average Limiter (PAL)
The Power Average Limiter Active warning (PAL Active) will be displayed when the power supply’s maximum rated
design parameters are reached. When this warning is displayed, gain limiting is being applied to the signal and the
ISVPL threshold is lowered accordingly.
PAL activity is shown by PSU amber LED indication and a corresponding text description in Tesira and CAFÉ
software programs. Refer to Section 14.1 for more information on warnings and faults.
11.3.4. Breaker Emulation Limiter (BEL™)
D Series ampliers are powerful devices that can draw a considerable amount of current from the mains supply.
The BEL models the temperature in the external breaker and limits the mains current to prevent the breaker
from tripping. The BEL can be congured with both a breaker prole and a nominal current value. The nominal
current value can be set from 5 to 32 Arms. The different models have different maximum current capabilities as
specied in the specication sheet. Also, the smaller models can be congured all the way up to maximum user
range. When the nominal current is set above the model’s capabilities, the actual current is set to the maximum
capabilities of the unit. Therefore, the nominal current can be set for the application and the conguration remains
cross-compatible with all the models. There are three different proles available for selection:
• Conservative – The conservative prole allows no momentary current above the congured threshold.
• Fast – The fast prole models the time constant of the trip–curve corresponding to a fast breaker. It momentarily
allows current above the threshold to pass for a short time, leading to an increased modeled temperature. For
the limiter to disengage, the current must be reduced below the threshold to enable the breaker to cool down.
• Universal – The universal prole models the time constant of the trip–curve corresponding to a slow breaker. It
momentarily allows current above the threshold for a longer time, leading to an increased modeled temperature.
For the limiter to disengage, the current has to be reduced below the congured current for the breaker to
cool down.
The BEL is congured manually with the Tesira and CAFÉ software. CAFÉs ESP design aid can also predict the
current consumption, with the exact speaker requirements, and propose a safeguarding BEL conguration.
11.3.5. Under Voltage Limiter (UVL™)
D Series devices are equipped with an under voltage limiter. With multiple, powerful devices on a mains distribution
line, heavy current loads risk the reduction of voltage below that required for devices to function. The UVL reduces
the mains current draw when voltage drops below 80 V. The amount of reduction applied increases as mains
voltage drops towards 65 V; at 65 V the power supply is shut down. The mains supply is continually monitored and
when sufcient voltage returns the power supply automatically restarts.
11.3.6. Current Average Limiter (CAL™)
The Current Average Limiter (CAL) monitors the RMS current drawn from each power output channel to ensure
that the power output stages are not overloaded. When activated, it regulates the current to a safe level to