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Controls
When the instrument has been installed it requires virtually no control and is
by nature automatic. However please read the following notes on the three
modes of operation and the various displays provided for ease of use.
Operating Modes
There are three main modes of operation key selected as shown below:
NOTE:
The instrument is supplied with two keys. These keys are individual to
your instrument. Please make copies in case these keys are misplaced.
Castle Group does not keep spare keys and cannot supply replacements.
Manual
When the level has exceeded the trip level indicated by the top red LED on the
multi-level display, then the unit will trip. This will be indicated by the power
being removed and a red “tripped” light. In the manual position power must be
restored by pressing the reset button, which is prompted by the reset LED
being illuminated.
Auto
When the unit has tripped as above, the power will be restored automatically
after a pre-set delay. This delay time is user adjustable between 1 to 10
seconds. When the power is restored a mute function prevents the unit from
a further trip for 20 seconds from the beginning of the trip period. This mute
or disabling of the microphone input is necessary to allow the operator of the
amplifiers a reasonable time to adjust the level and ignore any momentary
increase when power.
This is normally the preferred mode of operation.
Override
In this mode power output is maintained even during a trip condition. This
should only be used when it is no longer necessary to control the level of
sound in the hall and surrounding buildings. The GA904 unit would not
normally be left in this position, but it may be useful if the situation with
annoyance to neighbours changes and is no longer a problem. Also a bypass
function may be useful when other equipment is being installed, tested or
repaired.
All the above modes are controlled by the keyswitch on the front panel and it
is suggested that the unit normally be left in the “auto” mode and the key
retained safely by the building manager and not left for any unauthorised
person to tamper with the function of the equipment.
