L-ACOUSTICS LA 24 MANUAL Version 2.2
17/11/08 17
Short circuit protection
All L-ACOUSTICS amplifiers are completely short circuit protected. The protection circuit
permits very high peak currents, but still holds the output devices within their safe operation
area. If a short circuit is maintained, the channel affected will eventually go into thermal
protection and the cycle will repeat.
AC mains voltage protection
If the AC mains voltage is outside the 20% range of allowed operation voltage (over or under
voltage), the power supply will shut itself down. When the mains voltage is above the
minimum start voltage and below its maximum operating voltage the amplifier will restart
again.
It takes a couple of seconds for the amplifier to check its circuits (this is known as the "soft
start" or "slow start" sequence), then the gain will slowly and gradually be raised back to
normal and the fans then blow at high speed before going into "idle". The two green ”ON”
LEDs indicate when the power supply is operating properly.
DC protection
There are two types of DC protection:
Fuses on the supply branches of each channel (this is an
IEC 65
requirement) and Crowbar
type protection that shorts the output. Both of these circuits come into effect once a DC
level of 10 volts or more is detected on either channel.
