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Effective 06 2020
Drawing No. LP1155
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 #FCOR0000)
Line Filters for input power cables:
Schaffner # FN2010-1/07 (Red Lion #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
for more information on EMI
guidelines, Safety and CE issues as they relate to Red Lion products.
INSTALLATION
Gateway DIN Rail Mounting
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 in order to
ensure proper thermal
regulation. For environments
with vibration or impacts, DIN
rail clamps are recommended.
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.
Recommended DIN Rail Mounting Steps:
1. Ensure the DIN rail lock latch is in the outward most position
(unlocked). Hook the top back of the DA50A DIN rail clip on
the unit over the DIN rail.
2. Push the bottom of the unit towards the DIN rail until the
unit is flush with the rail.
3. Push the DIN rail lock latch to the latched (in) position.
Recommended DIN Rail Removal Steps:
1. Move the DIN rail lock latch to the unlatched (out) position.
2. Unhook the top of the unit and remove it from the DIN rail.
SLED INSTALLATION
1. Prior to installing the Sled for your DA50A Gateway
application, ensure that the Gateway is not receiving power.
2. Disconnect and remove your DA50A from the DIN rail.
3. Remove the DA50A Gateway’s front cap by squeezing the
sides and pulling.
4. Slide out the sled holder.
5. Install a sled into the sled holder and hand tighten the captive
fasteners, or use a screwdriver.
6. Re-install the sled holder containing the sled into the
Gateway. Make sure it is fully seated.
7. Replace the front cap.
DIN RAIL LOCK LATCH
Unlock
Lock
CAUTION
: Follow standard ESD precautionary
procedures.
ATTENTION
: Suivez les procédures de précaution
standard de décharge électrostatique.
CAUTION
: Failure to properly align the sled holder
can result in damage to the connector pins.
ATTENTION:
Si le tiroir n’est pas correctement
aligné, les broches du connecteur du tiroir risquent
d’être endommagées.
