9

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 the 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 this meter is designed with a high degree of immunity to Electro-

Magnetic 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 meter may be different for various

installations. The meter becomes more immune to EMI with fewer I/O

connections. Cable length, routing, and shield termination are very important

and can mean the difference between a successful or troublesome installation.

Listed below are some EMC guidelines for successful installation in an

industrial environment.

1. The meter should be mounted in a metal enclosure, which is properly

connected to protective earth.

2. 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 meter and leave the other end of the

shield unconnected and insulated from earth ground.

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 ran 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.

4. Signal or Control cables within an enclosure should be routed as far as possible

from contactors, control relays, transformers, and other noisy components.

5. 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 # 1 VR3

Note: Reference manufacturer’s instructions when installing a line filter.

6. Long cable runs are more susceptible to EMI pickup than short cable runs.

Therefore, keep cable runs as short as possible.

7. Switching of inductive loads produces high EMI. Use of snubbers across

inductive loads suppresses EMI.

Snubber: RLC# SNUB0000.

4.0 wiring The meTer

4.1 POWER WIRING

1

2

AC Power

Terminal 1: VAC

Terminal 2: VAC

1

2

+

-

DC Power

Terminal 1: +VDC

Terminal 2: -VDC

4.2 USER INPUT WIRING

Before connecting the wires, the User Input Logic Jumper should be verified for proper position. If User Input 1 and/

or 2 are wired for quadrature or directional counting, an additional switching device should not be connected to that User

Input terminal. Only the appropriate User Input terminal has to be wired.

Sourcing Logic

Terminals 7-9:

+ VDC through external switching device

Terminal 10:

-VDC through external switching device

The user inputs of the meter are internally

pulled down to 0 V with 5.1 K resistance.

The input is active when a voltage greater

than 2.4 VDC is applied.

7

8

9

10

Sinking Logic

Terminals 7-9

Terminal 10

The user inputs of the meter are

internally pulled up to +12 V with 5.1 K

resistance. The input is active when it is

pulled low (<0 .9 V).

Connect external switching device between the

appropriate User Input terminal and User Comm.

7

8

10

9

+

-

(30V max.)

SUPPLY

V

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