Operation; Use Procedures - RAM LMS 266 Hardware Manual

RAM Audio LMS 266 / LMS 221 Digital Controller – Hardware Manual

4.- OPERATION

Use Procedures

a.- Before switching on
LMS 221/ LMS 266 includes a precise self-regulated switching power supply. This means that it
can adapt to every voltage between 85 and 265 volts and frequencies between 50 and 60Hz.
This way the processor's perfect working order is guaranteed under any voltage supply, so the
final sound quality does not depend of the mains voltage state or generator used. Nevertheless,
it is always recommendable to check the net voltage first to avoid possible problems as to
connect the controller to 380 volts. LMS 221 / LMS 266 includes a fuse holder with a spare fuse
(1A) in the connector's input IEC of the mains cable.
Please turn the volume of the amplifier down before you switch the processor on. This way later
we can check that every processor's output is connected to its corresponding amplifier, avoiding
possible irreparable damages of the loudspeaker (mainly the drivers).
In an installation it is convenient to connect the audio and lighting systems in independent
voltage lines to separately protect two parts and minimize the interferences between the
systems.
b.- After switching on
Turning on the LMS 221 / LMS 266, the audio outputs will remain short-circuited to ground for a
few seconds in order to avoid the dangerous transitories in the switching on, so the processor
waits for a stable voltage and carries out intern verifications (working order of converters, check
the work memory, DSP processors starting and loading of the actual configuration.). Afterwards,
if all is working well, all the outputs commute at the same time introducing the audio in each
output.
To check the correct connection between LMS 221 / LMS 266 and the power amplifier,
introduce audio into the processor (the green front LEDS signal will light) and increase the
volume of the amplifiers channel by channel, checking that every way outputs attacks its
corresponding amplifiers.
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