Rice Lake SCT-30 - Manual (Page 6)

2 SCT-30 Weight Transmitter Manual
1.1.3 Equipment Recommendations
Failure to follow the installation recommendations will be
considered a misuse of the equipment.
To Avoid Equipment Damage
• Keep away from heat sources and direct sunlight.
• Protect the instrument from rain.
• Do not wash, dip in water or spill liquid on the instrument.
• Do not use solvents to clean the instrument.
• Do not install in areas subject to explosion hazard.
1.1.4 Correct Installation of Weighing Instruments
• The terminals indicated on the instrument’s wiring diagram to be connected to
ground must have the same potential as the scale structure (ground). If you are
unable to ensure this condition, connect a ground wire between the instrument
and the scale structure.
• The load cell cable must be run separately to the instrument input and not share a
conduit with other cables. A shielded connection must be continuous without a
splice.
• Use “RC” filters (quench-arcs) on the instrument-driven solenoid valve and
remote control switch coils.
• Avoid electrical noise in the instrument panel; if inevitable, use special filters or
sheet metal partitions to isolate.
• The panel installer must provide electrical protection for the instruments (fuses,
door lock switch, etc.).
• It is advisable to leave equipment always switched on to prevent the formation of
condensation.
• Maximum cable lengths:
- RS-485: 1000 meters with AWG24, shielded and twisted cables
- Analog current output: up to 500 meters with 0.5 mm
2
cable
- Analog current output: up to 300 meters with 0.5 mm
2
cable
1.1.5 Correct Installation of the Load Cells
Installing Load Cells:
The load cells must be placed on rigid, stable structures within .5% of plumb and
level. It is important to use mounting modules for load cells to compensate for
misalignment of the support surfaces.
Protection Of The Load Cell Cable:
Use waterproof sheaths and joints in order to protect the cables of the load cells.
Mechanical Restraints (pipes, etc.):
When pipes are present, we recommend the use of hoses, flexible couplings and
rubber skirted joints. In case of rigid conduit and pipes, place the pipe support or
anchor bracket as far as possible from the weighed structure (at a distance at least 40
times the diameter of the pipe).
Important