SOMMAIRE
E 11
Annex 1: EMC consideration
1) Introduction:
In order to satisfy its policy of Electromagnetic compatibility, based on the EU Directive 89/336/EC,
LOREME company takes into account the standards relative to this directive early in the design of each product.
All tests performed on devices designed to work in industrial environment, are compliant to EN 50081-2 and EN 50082-2
in order to establish the EMC compliance certificate.
The devices being in some typical configurations during the test,
it is impossible to guarantee results in all possible configurations.
To ensure optimum operation of each device ,it would be judicious to comply with several recommendations of use.
2) Recommendations:
2.1) General information:
- Comply with the mounting recommendations (mounting direction, devices spacing ...) specified in the datasheet.
- Follow the recommendations of use (temperature range, protection) specified in the datasheet.
- Avoid dust and excessive moisture, corrosive gases, sources of heat.
- Avoid disturbed environments and disruptive phenomena.
- If possible, group together the instrumentation devices in a zone separated from the power and relay circuits.
- Avoid close proximity with remote switches for high power, contactors, relays, SCR ,...
- Do not approach within two feet of a device with a walkie-talkie ( 5 W output power),
because it creates a electromagnetic field with an intensity greater than 10 V / M for a distance of less than 50 cm.
2.2 ) Power supply:
- Observe the characteristics specified in the datasheet (Voltage and frequency tolerance).
- It is preferable that the power comes from a system with section switches equipped with fuses for
instrumentation components, and the supply line is the most direct route possible from the section switch.
Avoid using this power supply to control relays, contactors, solenoid valves, …
- If the power circuit is heavily disturbed by SCR switching , motor, inverter, ...
it may be necessary to install an isolation transformer specifically for instrumentation
and connecting the screen to ground.
- It is also important that the installation has a good grounding, and preferable that the voltage
compared to neutral does not exceed 1V, and the ground resistance less than 6 ohms.
- If the installation is located near high frequency generators or arc welding, it
is preferable to mount adequate power line filter.
2.3) Inputs / Outputs:
- In harsh conditions, it is advisable to use sheathed twisted cables whose ground braid will be grounded at on point.
- It is advisable to separate the input/output lines from the power supply lines in order to avoid the coupling phenomena.
- It is also advisable to minimize the lengths of data cables.
4-20mA signal isolator, signal splitter with 2,3,4 outputs
SIL2 / SIL3
CAL4/100ig CAL4/100igM