Bosch PRAESENSA PRA-CSLD - Amplifier Loads

108 en | Diagnose PRAESENSA
2020-09 | V1.20 | PRAESENSA 1.20 Configuration manual Bosch Security Systems B.V.
6.3 Amplifier loads
The Amplifier loads page in the Diagnose section is used to measure the amplifier load (in
Watt) per amplifier output channel. An amplifier load uses an amount of Watt, whereas an
amplifier provides a number of Watts.
Notice!
It is an essential step in the system configuration to do a load measurement to check whether
the amplifier channels and the amplifier are not overloaded. Without this check, the amplifier
channel volume is automatically set to -12dB to protect the amplifier from unexpected
overload conditions in case of an alarm situation.
Notice!
When it is needed to change the output voltage; save the configuration and restart the system
before doing a load measurement on the amplifier outputs. Results of previous measurements
are wrong when the output voltage selection has changed. See also System settings, page 69 .
The following information is presented on the Amplifier loads page:
Item Description
Measure For each amplifier a Start button is presented to start the load
measuring of the amplifier selected.
Name Shows the name of the amplifier and each amplifier output channel.
See Add a device, page 41 .
Topology
(@ 70 / 100V)
Select and click Channels below Topology to see which output (A and/
or B) is selected/connected. See Amplifier, page 48 .
Overload Select and click Channels below Topology to see the amplifier Output
overload xxxW@yyyHz, if any. Where xxx is the measured overload in
Watt at yyy frequency in Hz. The measured result is visible after using
the Start button or if another measurement was done before. See the
“Start measuring output load” section in this chapter.
Notice that no (overload) message is shown if the load is equal or less
than the total amount of load +20% (Watt) provided by the amplifier.
An overload will be shown as follows at:
Channel1: > 720W (100V) of 600W. > 510W (70V) of 425W.
Channels2‑4/8 > 360W of 300W.
Protection Shows -12dB (decreased output level) in case the amplifier is in
amplifier protection state at an overload or if another measurement
was done before. The column field is empty in case of no overload is
measured (before).
Notice that the result is visible after using the Start button and when
another measurement is done before. See the “Start measuring output
load” topic in this chapter.
Status A status message will show the overall measuring result of both the
amplifier and channels. When no error is noticed, the text will show;
OK. See the status messages table following.