Rice Lake SCT-10 - Manual (Page 6)

2 SCT Weight Transmitter Operator’s 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 earth 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 metres with AWG24, shielded and twisted cables
- RS-232: 15 metres for baud rates up to 19200
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 water-proof 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).
Welding:
Avoid welding with the load cells already installed. If this cannot be avoided,
place the welder ground clamp close to the required welding point to prevent
sending current through the load cell body.
Important