Red Lion CUB4L - Manual (Page 2)

2
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. Use shielded (screened) cables for all Signal and Control inputs. The shield
(screen) pigtail 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 only at the panel where the unit is mounted to earth
ground (protective earth).
b. Connect the shield to earth ground at both ends of the cable, usually when
the noise source frequency is above 1 MHz.
c. Connect the shield to common of the unit and leave the other end of the
shield unconnected and insulated from earth ground.
2. 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 in 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.
3. 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. In extremely high EMI environments, the use of external EMI suppression
devices, such as ferrite suppression cores, is effective. Install them on Signal
and Control cables as close to the unit as possible. Loop the cable through the
core several times or use multiple cores on each cable for additional protection.
Install line filters on the power input cable to the unit to suppress power line
interference. Install them near the power entry point of the enclosure. The
following EMI suppression devices (or equivalent) are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251 (RLC #FCOR0000)
TDK # ZCAT3035-1330A
Steward #28B2029-0A0
Line Filters for input power cables:
Schaffner # FN2010-1/07 (RLC #LFIL0000)
Schaffner # FN670-1.8/07
Corcom #1VR3
Note: Reference manufacturer’s instructions when installing a line filter.
5. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
INSTALLATION ENVIRONMENT
The unit should be installed in a location that does not exceed the maximum
operating temperature and provides good air circulation. Placing the unit near
devices that generate excessive heat should be avoided.
The bezel should be cleaned only with a soft cloth and neutral soap product.
Do NOT use solvents. Continuous exposure to direct sunlight may accelerate
the aging process of the bezel.
Do not use tools of any kind (screwdrivers, pens, pencils, etc.) to operate the
keypad of the unit.
Installation
The CUB4L8W meets NEMA 4X/IP65 requirements for indoor use, when
properly installed. The units are intended to be mounted into an enclosed panel.
The viewing window and reset button are factory sealed for a washdown
environment. A sponge rubber gasket and mounting clip are provided for sealing
the unit in the panel cut-out.
The following procedure assures proper installation:
1. Cut panel opening to specified dimensions. Remove burrs and clean around
panel opening.
2. Carefully remove the center section of the panel gasket and discard.
Slide gasket over rear of the unit to the back of the bezel.
3. Assemble nut fastener first and then mounting screw onto both sides of
mounting clip. Tip of screw should not project from hole in mounting clip.
4. Install the unit through the panel cut-out until front bezel flange contacts the
panel-mounted gasket.
5. Slide the mounting clip over the rear of the unit until the mounting clip is
against the back of the panel. The mounting clip has latching features which
engage into mating features on the unit housing.
Note: It is necessary to hold the unit in place when sliding mounting clip into
position.
6. Alternately tighten each screw to ensure uniform gasket pressure. Visually
inspect the front panel gasket. The gasket should be compressed about 75 to
80% of its original thickness. (Recommended torque is 28 to 36 in-oz.) If not,
gradually turn mounting screws to further compress gasket.
7. If gasket is not adequately compressed, and mounting screws can no longer
be turned, loosen mounting screws and check that mounting clip is latched as
close as possible to panel.
Repeat procedure for tightening mounting screws.
EXISTING
PANEL
0.05" TO 0.20"
(1.3 TO 5.1mm)
THICK
GASKET
0.093"
(2.4 mm)
THICK BEZEL
MOUNTING
CLIP
NUT
FASTENER
MOUNTING
SCREW
LATCHING
FEATURE
LATCHING
FEATURE