Rice Lake Master BS211, Installation Manual

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4 BS211 Belt Scale
2.1 Mechanical Installation
The mechanical installation of a belt scale consists of mounting the weighframe, the speed pickup and the junction
box.
2.1.1 Installation Weighframe
The design and the installation of the weighframe depend on the type of conveyor. The weighframe is supplied in
one part and it also must be mounted in one part, according to the specific drawing.
Use
drawing BS211-M0200 or the specific project drawing.
1. Determine the location of the weighing roller station(s).
2. Determine from the hart of the weighing roller, the position of the load cell carriers and pivots. Point out
the position of the holes and drill the holes Ø18 mm.
3. Mount the weighframe.
4. Place the weighing roller station on the mounting plates and point out its location for welding.
5. Weld the plates to the weighing roller station, after taking them off the weighframe. Do not weld on the
weighframe, to prevent damage to the load cell.
6. Adjust the rollers in the weighing section (three before, one on and three after the weighframe) against the
rollers (or any other belt support) both before and after the weigh section.
2.1.2 Installation Speed Pickup
1. Mount the speed pickup, according to the drawing, at a (non-driven) tail drum or running roller.
2.1.3 Installation Junction Box
1. Mount the junction box near the weighframe, not further than 0.5 meter from it. The cable glands must
point downwards.
2.2 Electrical Installation
The wiring and connections between weighframe, speed pickup and the electronics are shown in the applicable
scheme, see Section 4.1 on page 7.
The load cell is provided with a fixed cable; do not alter the length. An additional junction box with screw
terminals is provided to extend cable length.
Cable Types
Load cell
• If the length is less than 60 meters, use shielded 4 wire cable 0.75 mm².
• If the length is more than 60 meters, use shielded 6 wire cable 0.75 mm².
Speed pickup
• Use shielded 3 wire cable 0.75 mm².
Shielding
• The cable shielding must be connected to one side only. If connected to the instrument side, then
preferably use the same ground as the power supply.
ATEX
If the system is placed in zone 21 or zone 22, it must be connected to a ground as indicated on the drawings:
• If metal parts are mounted isolated (i.e. by paint, plastic or rubber materials), then an earth strip or
other form of grounding must be placed from the weighed part to the fixed part of the weighframe.
• An earth strip must be placed from the fixed part of the weighframe to the conveyor construction.
• The conveyor must be grounded to a central or local earth pin.
• The belt must be manufactured of an anti-static material.
Note
If the weighframe consists of two parts, then the earthing must be provided on both sides.
Earth leads or any other form of grounding must never affect the weighing function.