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Revised 03 2020 Drawing No. LP1122
EMC INSTALLATION GUIDELINES
Although Red Lion Controls’ products are designed with a high
degree of immunity to Electromagnetic Interference (EMI), proper
installation and wiring methods must be followed to ensure
compatibility in each application. The type of the electrical noise,
source or coupling method into a unit may be different for various
installations. Cable length, routing, and shield termination are
very important and can mean the difference between a successful
or troublesome installation. Listed are some EMI guidelines for a
successful installation in an industrial environment.
1. A unit should be mounted in a metal enclosure, which is
properly connected to protective earth.
2. Use shielded cables for all Signal and Control inputs. The
shield connection should be made as short as possible. The
connection point for the shield depends somewhat upon the
application. Listed below are the recommended methods of
connecting the shield, in order of their effectiveness.
a. Connect the shield to earth ground (protective earth) at one
end where the unit is mounted.
b. Connect the shield to earth ground at both ends of the cable,
usually when the noise source frequency is over 1 MHz.
3. Never run Signal or Control cables in the same conduit or
raceway with AC power lines, conductors, feeding motors,
solenoids, SCR controls, and heaters, etc. The cables should
be run through metal conduit that is properly grounded. This
is especially useful in applications where cable runs are long
and portable two-way radios are used in close proximity or if
the installation is near a commercial radio transmitter. Also,
Signal or Control cables within an enclosure should be routed
as far away as possible from contactors, control relays,
transformers, and other noisy components.
4. Long cable runs are more susceptible to EMI pickup than
short cable runs.
5. In extremely high EMI environments, the use of external EMI
suppression devices such as Ferrite Suppression Cores for
signal and control cables is effective. The following EMI
suppression devices (or equivalent) are recommended:
Fair-Rite part number 0443167251 (Red Lion Controls
#FCOR0000)
Line Filters for input power cables:
Schaffner # FN2010-1/07 (Red Lion Controls #LFIL0000)
6. To protect relay contacts that control inductive loads and to
minimize radiated and conducted noise (EMI), some type of
contact protection network is normally installed across the
load, the contacts or both. The most effective location is
across the load.
a. Using a snubber, which is a resistor-capacitor (RC) network or
metal oxide varistor (MOV) across an AC inductive load is very
effective at reducing EMI and increasing relay contact life.
b. If a DC inductive load (such as a DC relay coil) is controlled
by a transistor switch, care must be taken not to exceed the
breakdown voltage of the transistor when the load is
switched. One of the most effective ways is to place a
diode across the inductive load. Most Red Lion products
with solid state outputs have internal zener diode
protection. However external diode protection at the load is
always a good design practice to limit EMI. Although the
use of a snubber or varistor could be used.
Red Lion part numbers: Snubber: SNUB0000
Varistor: ILS11500 or ILS23000
7. Care should be taken when connecting input and output
devices to the instrument. When a separate input and output
common is provided, they should not be mixed. Therefore a
sensor common should NOT be connected to an output
common. This would cause EMI on the sensitive input
common, which could affect the instrument’s operation.
Visit http://www.redlion.net/emi for more information on EMI
guidelines, Safety and CE issues as they relate to Red Lion
products.
HARDWARE INSTALLATION
Removing Module From Cradle
To remove the module from the cradle, push in the module
release button at the top of the cradle and pull the module out of
the cradle.
Attaching the Module/Cradle to the DIN Rail
The DIN rail should be mounted
horizontally so that the unit’s
ventilation holes are vertical in
relation to installation orientation.
A minimum clearance of 1 inch
(25.4 mm) should be maintained
above and below the unit to
ensure proper thermal regulation.
The cradle can be installed on
the DIN rail with or without the
module attached. Ensure the DIN
rail lock latch is in the outward
most position (unlocked). Hook
the top back of the cradle DIN
rail clip over the DIN rail. Press
the cradle until flush with the rail
and push the DIN rail lock latch to the latched (in) position.
For hazardous location installation, the following shall be taken
into consideration:
— The equipment shall only be used in an area of at least
pollution degree 2, as defined in EN/IEC 60664-1.
— The equipment shall be installed in an enclosure that provides
a minimum ingress protection of IP54 in accordance with EN/
IEC 60079-0. The enclosure shall be accessible only with the
use of a tool.
— Transient protection shall be provided that is set at a level not
exceeding 140% of the peak rated voltage value at the supply
terminals to the equipment.
Installing Module into Cradle
Push module into cradle until you hear an audible click
indicating it is properly latched.
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MODULE
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CRADLE
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DIN RAIL LOCK LATCH
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MODULE CRADLE
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DIN
rail