Bosch IRIS-Net User Manual page 144

IRIS-Net
OVER TEMPERATURE
COMMUNICATION
SHORTED / LOAD LO
OPEN / LOAD HI
SUPERVISION
INPUT PILOT
DETECTION
OUTPUT PILOT
DETECTION
GROUND FAULT
Bosch Security Systems B.V.
This indicator lights red when the power amp's temperature exceeds the pre-set threshold,
which defaults to 110 °C. If necessary, changing the temperature threshold is possible via
THERMAL LIMIT.
The power amp, however, is protected against thermal overload at all times, independent of
the indication.
This indicator shows whether communication at the CAN bus interface is normal (green) or
when a problem exists (red). The power amp automatically detects whether commands
from a PC or another central control unit are missing and signals the problem via the
Communication Flag.
This indicator lights red when the measured impedance value of the corresponding power
amp output falls below a pre-set minimum or when it is shorted. Setting the minimum value
is possible in the Load dialog.
This indicator lights red when the measured impedance value of the corresponding power
amp output exceeds a pre-set maximum or when cable interruption is detected. Setting the
maximum value is possible in the Load dialog.
Each amplifier channel can be monitored via internal pilot-tone signal. Pilot-tone signal (19
kHz, -10dBu) as well as detection and evaluation are active when the GENERATOR ON/OFF
switch is engaged. The indicator lights green as long as the pilot-tone signal is detected with
a sufficient level at the power amp output. A missing pilot-tone signal or a drop in its level
below -14 dBu / 150 mV results in fault detection. Indication changes to red.
A remote amplifier's audio inputs support pilot-tone detection and evaluation. Using an
externally generated pilot-tone signal allows the monitoring of audio cables and analog input
stages. The threshold for 19 kHz pilot-tone evaluation is set to -40 dBu / 7.75 mV. The
indicator lights green when an external pilot-tone signal coming from mixer, matrix,
controller, etc. is detected. A missing pilot- tone signal or a drop in its level below the
evaluation threshold causes the indicator to change to red. Only mark the DETECT box next
to the indicator when an external pilot-tone signal actually exists and input monitoring has
been configured.
This indicator is for amplifier monitoring via external pilot-tone signal. In that case, internal
pilot-tone generation needs to be switched off to avoid interference between the two
signals. Detection and evaluation is performed at the amplifier output. The indicator lights
green when a 19 kHz pilot-tone signal with a level of at least -14 dBu / 150mV is detected. A
missing pilot-tone signal or a drop in its level below -14 dBu (threshold) results in error
detection. The indicator changes to red.
CAUTION: The externally fed pilot-tone signal passes through the entire signal path of the
remote amplifier, i.e. the signal is influenced by filtering and x-over settings. When
setting the external pilot-tone generator's level, make sure to mind possible
amplification/attenuation applied by internal filters.
This indicator only exists for power amps with 100V transformer outputs (P900RT and
P1200RT). Speaker cabling is realized in 100V technique, i.e. usually without ground
reference - floating. If the indicator lights red, the evaluation circuit has detected a ground
fault at the amplifier output or in the loudspeaker cabling. Once detected, a ground fault is
stored in the power amp. After remedying the cause of the ground fault, press the CLEAR
button to clear the indication.
User Manual
REMOTE AMPLIFIER | en
2017.05 | 3.20 | F.01U.119.956
144