VAR8 and Variants Operation, Commissioning, Fault Finding, and Maintenance Guide
sue: 02 complete, approved
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Page 21 of 166
c. Set the input and output AC levels.
Menu: ConfigurationÆFramesÆFrame#<nn>ÆSlot#<n>ÆAC LevelÆThresholds
The VAR8 presents the input and output AC levels based upon a fixed proportion of the levels being
detected. These detected levels can be used as the threshold levels. The user has the option to set
other threshold levels. Pressing SELECT stores these values as the reference thresholds. Any
deviation from these threshold levels will be reported as a fault if the AC surveillance is to be
performed.
When the surveillance tone level is set to the recommended level of –12dB, the typical thresholds
values reported by the surveillance card are:
Input Threshold = 200–300mV
Output threshold = 600–900mV
8. Set-up loudspeaker DC line surveillance functions for each amplifier slot configured in step 6 and
monitored by a LSDDC or a LSDIC Surveillance Interface Card.
Menu: ConfigurationÆFramesÆFrame#<nn>ÆSlot#<n>ÆDC Line
a. Enable the amplifier DC surveillance.
Menu: ConfigurationÆFramesÆFrame#<nn>ÆSlot#<n>ÆDC LineÆSurveyed
b. Set the numbers of EOL resistors along the speaker circuit according to the installation.
Menu: ConfigurationÆFramesÆFrame#<nn>ÆSlot#<n>ÆDC LineÆSpurs
A fault will be reported on any deviation from the configured number of EOLs if DC surveillance is to
be performed.
L
• The Read facility provides the number of EOL resistors on the loudspeaker line
detected by the Router, and suggests this as the correct figure by assuming no
faults are present. However it is recommended to edit manually the number of EOL
resistors according to the installation to avoid an incorrect setting.
• The maximum value for ‘spurs’ is 10, as no more than 10 EOL resistors can be
used on one amplifier.
• The number of EOL resistors is referred to as ‘spurs’. This is because there must
be an EOL resistor at the end of every spur on the loudspeaker circuit. However
improved fault reporting can be obtained on long loudspeaker lines by fitting EOL
resistors at regular intervals in long single runs. Therefore there may be more EOL
resistors than spurs.
• Note that to commission the values, it is necessary to select SET and then press
SELECT.
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