powersoft LiteMod - Harmful Signal Protections

10 | LiteMod and LiteMod HV | User guide
11 : 5.1. Harmful signal protections
Bad signals can cause amplier and loudspeakers
damages. In order to limit damages, harmful signal triggers
specic protections.
11 : 5.1.1. Output short circuit
If the load impedance is too low or the loudspeaker line
has a short circuit (because of voice coil damages, wires
short circuit, improper wiring, etc), the amplier output cur-
rent rises to harmful values.
When the output current reaches 31 A
peak
the amplier
section switches off, the power supply still working. After 2
seconds the amplier section switches on: if the short circuit
still persists, the current rises and the amplier switches off
again. The system toggles the ampliers on and off every 2
seconds until the short circuit is removed.
11 : 5.1.2. RMS output current protection
When the load is absorbing more that 10 A
rms
for a long
time span the amp module inteds this as a fault that can
damage the output stage: the amplier section switches off,
the power supply still working. After 2 seconds the ampli-
er section switches on: if the fault still persists, the current
rises and the amplier switches off again. The system tog-
gles the ampliers on and off every 2 seconds until the fault
is removed.
11 : 5.1.3. High frequency stationary loud signals
High frequency stationary signals, like steady sinusoid
signals – improperly referred as continuous signals – with
high amplitude tend to stress the amplier section of the
module as well as the loudspeakers voice coils.
If the output signal in the band 10 kHz – 20 kHz exceeds
40 V
RMS
than the amplier stage switch off; above 20 kHz
the protection operates when the output amplitude exceeds
20 V
RMS
.