Installation - Priva Compass Installation Manual

Priva
Materials required
A 4 x twisted pair of shielded cables should be laid between the process computer and the weighing
indicator, with the following specifications:
• 8 core, twisted pair, fully shielded
•
Core area 0.5 mm
• Cable diameter 8 mm (this is necessary for a correct fit when feeding it through the grommet
supplied with the weighing indicator).
Out of these, 4 cores (4 pairs) will be used for the power supply and 2 cores (2 pairs) will be used for
the output signals of the weighing indicator. The weighing indicator will be supplied by a supply
voltage of 24VAC or 24VDC coming from the process computer. Use a fused supply voltage for this.
The weighing indicator contains two analog outputs which are used to pass the weight shown on
the display to the process computer. Either one or two analog inputs are used, depending on the
type of process computer being used and the software version running. With modern computer
systems, it would be advisable to connect both outputs to a 0 - 5V analog input, with a view to future
software operation. In this case, both analog inputs should be used on the same IO-board. On older
computers, only the first analog output can be connected.
A double core pair can be used to bridge the distance to the weighing indicator, depending on
whether the supply voltage is AC or DC. Use a separate cable for each weighing indicator.
Power supply
24VAC
24VDC

Installation

Installing weighing platforms
Layout for support frame, dimensions in mm
1. Determine the distance between the weighing platforms. If you are using the weighing support
frame, position the platforms with a centre-to-centre distance equal to the length of your weighing
system minus 60 cm. (For instance: with two 100 cm tanks plus a distance between them of 20
cm, the platforms should be positioned with a centre to centre distance of 220 - 60 = 160 cm
apart). If the weighing support frame is not being used, it is best to position the platforms at a
quarter of the total distance from both ends of the weighing system.
2. Determine whether the weighing platforms should be installed in a recessed manner, so that
the substrate slabs are flush with the other slabs. In this case, it must be guaranteed that the
weighing platforms will remain dry. Make sure therefore that there is good drainage and pay
attention to the maximum groundwater levels that may occur.
3. Excavate at least 5 cm of soil below the foundations of the weighing platforms for a bed of sand.
If the weighing platforms are to be installed in a recessed manner, the soil below the weighing
support frame must also be removed, so that the weighing frame is suspended entirely freely.
In the case of a recessed arrangement, it is advisable to use a bed of sand of at least 30 cm in
order to ensure good drainage and, in addition, to apply a casing around the weighing platform
to prevent the excavation from collapsing.
4. Spread white sand in the excavated soil, and place the paving slabs on top.
5. Level the paving slabs and tap them with a rubber hammer. There may be a small difference in
height between the various paving slabs, to provide a slope.
104
2
Maximum cable length
800 m
1600 m
Installing Priva Compass - 00.014