CBLUSB01 datasheet(12/36 Pages) REDLION

12 / 36 page

WIRING OVERVIEW

Electrical connections are made via screw-clamp terminals located on the

back of the meter. All conductors should conform to the meter’s voltage and

current ratings. All cabling should conform to appropriate standards of good

installation, local codes and regulations. It is recommended that power supplied

to the meter (DC or AC) be protected by a fuse or circuit breaker.

When wiring the meter, compare the numbers embossed on the back of the

meter case against those shown in wiring drawings for proper wire position.

Strip the wire, leaving approximately 0.3" (7.5 mm) bare lead exposed (stranded

wires should be tinned with solder). Insert the lead under the correct screw-

clamp terminal and tighten until the wire is secure. (Pull wire to verify

tightness.) Each terminal can accept up to one #14 AWG (2.55 mm) wire, two

#18 AWG (1.02 mm), or four #20 AWG (0.61 mm).

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 (RLC part number 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 RLC 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.

RLC 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.

VisitRLC’swebsiteathttp://www.redlion.net/Support/InstallationConsiderations.

html for more information on EMI guidelines, Safety and CE issues as they

relate to Red Lion Controls products.

4.0 Wiring THe meTer

4.1 POWER WIRING

AC Power

Terminal 1: VAC

Terminal 2: VAC

DC Power

Terminal 1: +VDC

Terminal 2: -VDC

CBLUSB01 数据表(PDF) 12 Page - Red Lion Controls. Inc

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