Bosch PVA-4CR12, Руководство по эксплуатации

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Operation
In accordance with the specified and technical details for this product, the controller can be
used to control and monitor a PAVIRO public address and voice alarm systems within the
building installation.
The controller is not a stand-alone device. The following are the minimum requirements for
operation:
1.
A mains adapter (24 V) sufficiently configured for the system’s power demands.
2. If the device is to be operated with call stations: The required number of call stations
(max. 16) and the corresponding connecting cables.
3. If the audio element of the device is to be used: Power amplifier incl. cabling and
loudspeaker with cabling.
4. If the internal real-time clock is to be synchronized to the DCF77 time signal: An active
DCF77 reception antenna incl. cabling. (This feature can be used only in regions in which
the DCF77 signal can be received with sufficient strength, or if converters from different
time information to DCF77 are used.)
5. If slave clocks are to be controlled: The required number of slave clocks incl. cabling
6. If additional line relays and/or control inputs or outputs are to be used: A router and the
corresponding connecting cables.
Line supervision
For loudspeaker line supervision three different options are available. They differ in
performance, cost, and suitability for various applications and situations.
In general the device can detect open circuit and short circuit. In case of an open circuit only a
fault message will be generated. In case of a short circuit a fault message will be generated
and the loudspeaker line will be automatically deactivated to avoid influence to other
loudspeaker lines.
Impedance measurement
The PVA-4CR12 controller is equipped with a speaker line impedance measurement function.
This function measures the effective values of the output current and the output voltage. The
impedance value of the connected speaker line is calculated using these measurements. Due
to the frequency and temperature dependence of the speaker line, the value obtained can vary
substantially. A continuous sinusoidal signal with an appropriate frequency is recommended
for the measurement. The voltage and current measurements do not claim to be a calibrated
measurement of absolute values. The measured value is compared with the reference
measurement in question and a good/bad status is indicated depending on the difference
between these two values. If the controller is replaced, the reference measurement must be
performed again. The impedance measurement is configured using the IRIS-Net software.
Parameter Value Default setting
(IRIS-Net)
Impedance range 20–10000 Ω (corresponds to 500 W to
1 W)
Impedance tolerance 6% ± 2 Ω
Frequency range 20–4000 Hz 30 Hz
Voltage range 0.1–1.0 V 0.5 V
Table 8.1: Impedance measurement specification
8
8.1
8.1.1
PAVIRO Controller Operation | en 37
Operation manual 08-May-2017 | 04 | F01U306900