Formula Sound SENTRY MK2 Panduan Pengguna - Halaman 5
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Cable Entry And Fixing
Read this section fully before proceeding
Customising the box. Cable entry knock outs are provided on the rear and bottom faces of the
unit, using the rear cable entrys can result in a very neat installation. Select the cable entry
positions to be used and remove the appropriate knock outs. (A small flat blade screwdriver on
the perimeter of the hole will assist prizing out the blanking plugs.) Remove any sharp edges that
may damage cables or use protective grommets (not supplied)
NOTE:- Use a separate cable entry for mains connections. Always keep low voltage cables
away from mains cables and connections
Fastening the unit. The unit is secured to a wall by 3 screws (not supplied). The top centre
screw locates in a key hole slot on the back of the unit.
Use No. 10 or 12 screws with round heads 1.5" (38mm) minimum length. Brick or masonry walls
will require drilling and plugging in the usual manner.
First remove the cover to expose the bottom mounting screw holes, these are located in the
bottom corners of the case. Fit the top centre screw 30 mm down from the required top case
position, leave this screw approx. 1.5mm proud of the mounting face.
The unit may now be suspended on this screw while the two bottom mounting screw positions are
marked out (ensure that the unit is captive on the screw head so it cannot fall). Fit the bottom two
mounting screws.
Check that the unit is secure, cannot fall, and is not loose on the screws.
In high risk areas security screws should be utilised to prevent the unit from being removed.
Wiring For Applications Controlling The Mains Power
.
All mains wiring must be installed in accordance with IEE Regulations. If after reading
these instructions you are not sure how to proceed you should seek help from a
qualified electrician.
Overview
The Sentry provides outputs to control a contactor or relay which in turn will control the mains
supply. This strategy allows the Sentry to be mounted in the most suitable position for noise
measuring whilst the mains switching equipment (the relay or contactor) can be mounted in the
most convenient position for switching the mains power (fuse cupboard, etc.)
(A 32amp fully fused boxed contactor with low voltage interface has been designed for use with
the Sentry and is available from Formula Sound Ltd)
The extra safety and possible lower installation costs stemming from the fact that only low voltage
cable is required between the Sentry and contactor at minimal current are added benefits.
The Sentry also provides connections to use a mains coil contactor with a maximum coil
consumption of 60VA.
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