FIKE CORPORATION
Page 4 of 24 Fike SIM SystemCM
06/05 P/N 06-358
4.0 INSTALLATION
4.1 INSTALLATION OVERVIEW
The effectiveness of a control and detection
system, such as contact monitoring and
industrial supervision, depends upon the
correctness of the initial measurement of the
sensor device.
It is therefore, critical that all possible measures
are taken to reduce the individual system
components’ electrical disturbances to an
absolute minimum.
A supervision system basically consists of three
components: One or more sensor devices, an
electronic field module reading the sensor status
and one overall supervising control device.
Instrumentation wiring interconnects these
components.
The field module is microprocessor-based and
shall be installed in a location that maintains a
temperature rating of -10°C to 50°C (15°F to
125°F) when it is installed in an auxiliary
housing.
Electronic devices, microprocessors and field
wiring are influenced by the electromagnetic
“environment” surrounding these components.
The use of cellular telephones, transmitters,
induction motors, welding equipment or the
presence of power cables and transformers can
create environments with high levels of
electromagnetic radiation, resulting in induced
electrical “noise” or voltage peaks.
Such effects are known to designers and
manufacturers of instrumentation and control
systems (PLC’s), used in industrial
environments and are handled through the use
of specially designed electronic filters. These
filters neutralize the unwanted noise and offer a
“clean” signal for further processing.
It is essential to practice extreme caution when
selecting component location, cable
specifications, cable routes, and the
“cleanliness” of the offered power source. In
order to reduce the electromagnetic induced
noise to a level that will not affect the required
performance of the supervision control system,
verify all earth connections. It is preferred to
have the enclosure and conduits connected to
Protective Earth (similar with other building
grounds) while the drain wires from the field
wiring and each module ground connected to a
separate Instrument Earth. This Instrument
Earth connection shall not have inductive or
capacitive loading such as motors, welders, or
other industrial equipment. Where a separate
earth connection is not available, the drain wires
and module ground connections should be
made to the DC supply common. Complying
with the following recommendations will help
minimize the induced noise to acceptable levels.
