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Once the faulty amplifier has been replaced or
repaired, the unit recovers from the amplifier
error automatically.
In installations with a backup amplifier, when an
amplifier surveillance
connection between the FAIL RELAY contact of
the SU-114N and the CTRL contact of the COU-
02/ES card switches the zone amplifier for the
backup amplifier. When the backup amplifier
starts to operate, critical path and loudspeaker
line surveillance in that zone is stopped.
Loudspeaker line surveillance:
An internal DSP in the SU-114N generates a tone
that is sent to the loudspeaker line, collected by
the SU-114N itself and analysed. If the values
analysed exceed the limits established during the
setting process, a high impedance/open line or
low impedance/short circuit error is generated.
The line errors detected are communicated to the
MD-500EM, the UMX-02/0 audio matrix and the
Control PC.
When a high impedance line error is detected,
the FAIL RELAY contact of the SU-114N zone is
activated. A low impedance line error (a short
circuit on a line, for example) does not activate
the
FAIL
RELAY
installations with backup amplifiers and COU-
02/0, this avoids switching a short circuited line
on the backup amplifier.
Detection of the same error on a loudspeaker line
five consecutive times stops surveillance on that
line. In this case, once the loudspeaker line has
been repaired, this line must be included in the
surveillance process once again. To do this, two
options are available:
a. It can be done manually, by simultaneously
pressing buttons A and B on the front of the
SU-114N (see section 11).
b. Or you can wait for the software to perform
this task automatically, in accordance with the
configuration of the parameter Measurement
interval between errors (see section 9.1., no.
14).
In installations with a backup amplifier, the FAIL
RELAY contacts of each zone of the SU-114N
must be connected to the CTRL. contacts of the
COU-02/ES cards. In this way, detection of a high
impedance error leads to switching of the zone
amplifier for the backup amplifier. When this
SU-114N version 1.3
error
is
detected, the
contact
of
the
card;
SU-114N
occurs, the zone of the SU-114N configured as
backup
surveillance.
Critical path surveillance:
Once loudspeaker line surveillance has been
completed, critical path status is checked.
For this purpose the SU-114N gives an order to
the MD-500EM to generate a tone of 17720 Hz.
This tone runs along the path from the desk to
the loudspeakers, before it returns to the SU-
114N and is analysed.
Errors detected by the SU-114N will be sent via
RS-485 to the MD-500EM, the UMX-02/0 and the
Control PC.
A critical path error does not activate the FAIL
RELAY contacts of the SU-114N.
When is surveillance performed? (on an
SU-114N
Master mode)
-
When the SU-114N is switched on (line
surveillance using an No audible frequency
and Critical Path).
in
-
When software defined scheduling is activated
(line surveillance using an No audible or
Audible frequency and Critical Path).
-
When indicated by the configuration of the
Timing Select Dipswitch on the front (line
surveillance using an No audible frequency
and Critical Path).
-
When the Measure Activation input contact is
activated (line surveillance using an Audible
frequency and Critical Path).
-
When measurement is forced by means of the
front keypad of the SU-114N (line surveillance
using an Audible and/or No audible frequency
and Critical Path).
-
The zones configured as backup amplifier
perform surveillance of the backup amplifier
with its load, when it is not in use.
-
Amplifier surveillance is constant.
-
The SU-114N units configured as slaves will
perform surveillance whenever it has been
determined by the Master or by software
defined scheduling.
Amplifier, speakers line
and critical path surveillance unit
amplifier
stops
loudspeaker
working
in
Stand
R&D Department
line
Alone
or
16
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