Red-lion LEGEND Manuel d'utilisateur télécharger pdf (Page 54)

EMC COMPLIANCE INSTALLATION

This unit complies with the Electromagnetic Compatibility (EMC) standards

listed in the specifications. Compliance to the EMC standards was demonstrated

by means of a test set-up using the following installation methods:

1. Unit installed in a metal panel mounted to an open aluminum rack

connected to earth ground (protective earth).

2. Shielded (screened) cables for Signal and Control inputs, and solid state

outputs (01-06 SNK) with shield drain wire connected to earth ground at

the mounting panel only.

Multi-conductor Cable Function Used For

Belden #8451 - 2 conductor, #22 AWG

twisted pair w/ foil shield and drain wire

User Input 4/Inhibit

Belden #8771 - 3 conductor, #22 AWG

with foil shield and drain wire

Input A, Input B, User Inputs 1,2 &

3, 01-06 SNK (solid state outputs)

Alpha #2404 - 4 conductor, #22 AWG

with foil shield and drain wire

RS485/RS232

3. EMI line filter (Corcom #1VB3) placed on the DC power supply when DC

powered.

Test: EN 61000-4-4 EFT and ENV 50141 RF Conducted Immunity.

4. Ground shield or ferrite suppression core (TDK #ZCAT3035-1330A) at

device end (opposite end from unit) on serial communication cable

eliminates serial transmission garble.

Test: RF Conducted Immunity per ENV 50141

It should be noted that the methods listed above may not be necessary for

every unit installation. For the purpose of EMC testing, every input and

output line on the unit was connected with 25 feet (8 m) of cable. In extremely

high EMI environments, additional measures may be needed. The unit

becomes more immune to EMI with fewer I/O connections. Cable length,

routing and shield termination are very importantand can mean the difference

between a successful or troublesome installation.

ADDITIONAL EMC INSTALLATION GUIDELINES

Although this unit is 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 the unit may be different for

various installations. Listed below are some additional EMC guidelines for

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.

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Red-lion LEGEND Manuel d'utilisateur Page 54

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