72
Power Supply and Protection of Power Amplifiers
The power supply and protection status of power amplifiers (signal cables) may be supervised if
the corresponding options are enabled. The power supply failure of power amplifiers on the same
audio channel cannot be identified separately. The MCU only shows the power supply failure of
the audio channel and users must check the indicators on the front panels of the power amplifiers.
Line Supervision Setting
Users can either enable or disable the supervision function of speaker lines and earth fault. In
the Earth column, the supervision of Earth fault for every speaker line can be enabled or disabled.
If users are authorized by entering the password, it is possible to change the parameters of line
supervision, including the impedance threshold between the speaker line and Earth and the
phase threshold for the supervision of short circuit and open circuit.
This device supervises speaker lines by measuring the phase difference between the original
testing signal and the pilot signal from speaker lines.
When the phase difference is higher than the threshold of short circuit and lower than the
threshold of open circuit, a short circuit fault will be detected in the speaker line. When the phase
difference is higher than the threshold of open circuit, an open circuit fault will be detected in the
speaker line. Usually the phase difference should be lower than the threshold of short circuit.
Select a line and click the
icon to set the rest of the parameters to be the same as the
selected one.
Contact Inputs
If the contact inputs are connected to third-party devices, the transmission line can be
supervised. This function can be configurable. If the supervision is enabled, two 10k
resistors
should be connected to each dry contact output of the third-party device. Please refer to
RK-ZONE24
1. Properties
Set the related working parameter as below:
