Red-lion PAX2D User Manual download pdf (Page 6)

The plug-in cards are separately purchased optional cards that perform

specific functions. These cards plug into the main circuit board of the meter.

The plug-in cards have many unique functions when used with the PAX2D.

CAUTION: The plug-in card and main circuit board contain static

sensitive components. Before handling the cards, discharge static

charges from your body by touching a grounded bare metal object.

Ideally, handle the cards at a static controlled clean workstation. Also,

only handle the cards by the edges. Dirt, oil or other contaminants

that may contact the cards can adversely affect circuit operation.

To Install:

1. With the meter removed from the case, locate the plug-in card connector for

the card type to be installed. The types are keyed by position with different

main circuit board connector locations. When installing the card, hold the

meter by the rear terminals and not by the front display board.

If installing the Quad sourcing Plug-in Card (PAXCDS40), set the jumper for

internal or external supply operation before continuing.

2. Install the plug-in card by aligning the card terminals with the slot bay in the

rear cover. Be sure the connector is fully engaged and the tab on the plug-in

card rests in the alignment slot on the display board.

3. Slide the meter base back into the case. Be sure the rear cover latches fully

into the case.

4. Apply the plug-in card label to the bottom side of the meter in the designated

area. Do Not Cover the vents on the top surface of the meter. The surface of

the case must be clean for the label to adhere properly.

Internal Supply

(18 V unregulated)

External Supply

(30 V )

max

3.0 insTalling plug-in Cards

Finger

Tab

Finger

Tab

Serial

Communications

Card

Setpoint

Output

Card

Alignment

Slots

Connectors

Analog Output

Card

Main

Circuit

Board

TOP VIEW

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 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.

Visit RLC’s web site at http://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

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Red-lion PAX2D User Manual Page 6

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