387 / 576
387
L ≤ 10 - 15 m
DB300007SE-40
DB300008SE-39
DB300010SE-60
DB300011SE-46
Spacial EMCsolution
Electromagnetic protected
steel enclosures
Introduction
Installation
According to the type of interference generated by the devices:
b
b
Low frequencies, "conducted interference" (up to 30 MHz),
b
b
High frequencies, "radiated interference" (higher than 1 MHz),
the rules to be taken into account relate to the choice of components that provide
the most economical solution to complete the installation.
Low-frequency interference
b
b
Importance of the protection systems:
v
v
filters, overvoltage suppressor, isolating transformer for the power supply,
v
v
cable length.
High-frequency interference
b
b
Importance of the installation method:
v
v
earth connections, cable length and section,
v
v
cable selection and rules, cable runs, connections,
v
v
enclosures and installation.
Specifics
Screen connections
It is recommended to earth screens at both ends. In addition, it is advisable to
increase the number of intermediate earth connections.
If the screen is only earthed at one end, there can be a considerable difference in
potential between the two ends. In addition, this screen will be ineffective against
external high-frequency interference.
Transformers
The transformer chassis must be mounted, metal to metal, on the reference potential
plate, that is, on a plain chassis supporting the equipment.
Cable runs
The metal ducts and conduits, when correctly connected, provide an extremely
effective second screen for the cables.
Cable ends must be screwed to the metal enclosures in order to provide an effective
connection.
Enclosures
The interfering and sensitive components, cables etc. should be installed in separate
enclosures or located at some distance from each other.
Note:
For further information, consult your local sales office or our educational leaflet entitled
"Electromagnetic compatibility".
Earth plate or
reference potential
sheet connected to
the chassis
Excellent
Soldered
Earth connection
by the screws
Metal ground plate or
reference potential sheet
Paint = INSULATION
Excellent
To the power
units
Mains
Actuators Sensors
Probes
Detectors,
etc.
Heating
Low level
Poor