Rockwell-automation 1794-IRT8XT/B TC/MV/RTD Input Module Installation Manual de usuario descargar pdf (Pagina 2)

Publication 1794-IN050J-EN-P - January 2009

North American Hazardous Location Approval

Series A/Series B Differences

Install Your TC/RTD Input Module

The module mounts on a 1794-TB3G or 1794-TB3GS terminal base.

1. Rotate the keyswitch (1) on the terminal base (2) clockwise to

position 3 as required for this type of module.

2. Make certain the flexbus connector (3) is pushed all the way to the

left to connect with the neighboring terminal base/adapter. You

cannot install the module unless the connector is fully

extended.

3. Make sure the pins on the bottom of the module are straight so

they will align properly with the connector in the terminal base.

4. Position the module (4) with its alignment bar (5) aligned with the

groove (6) on the terminal base.

5. Press firmly and evenly to seat the module in the terminal base

unit. The module is seated when the latching mechanism (7) is

locked into the module.

Connect Wiring for the 1794-TB3G, 1794-TB3GK and 1794-TB3GS Terminal

Base

1. Connect individual input wiring and associated signal returns

to numbered terminals on the 0…15 row (A) and the 16…33

row (B) as indicated in the table.

Use Belden 8761 cable for mV signal wiring, or the appropriate

thermocouple wire for your thermocouples.

2. Signal wiring shields can be connected to terminals 16 or 33 on

row (B) or terminals 40…45 on row (C).

3. Connect the +V DC power lead to terminal 34 on the 34…51 row

(C).

4. Connect the -V DC common (return-) to terminal 35 on the 34…51

row (C).

5. If daisy-chaining power to the next terminal base unit, connect a

jumper from terminal 50 (+V DC) on this base unit to +V terminal

on the next terminal base unit.

Connect a jumper from terminal 51 (-V DC common) to the -V DC

common terminal on the next terminal base unit.

6. If using cold junction compensators, make these connections as

shown in the CJC Sensor chart below.

WARNING

Observe the following additional Zone 2 certification requirements.

• This equipment is not resistant to sunlight or other sources of UV

radiation.

• This equipment must be installed in an enclosure providing at least

IP54 protection when applied in Zone 2 environments.

• This equipment shall be used within its specified ratings defined by

Allen-Bradley.

• Provision shall be made to prevent the rated voltage from being

exceeded by transient disturbances of more than 40% when applied in

Zone 2 environments.

• Secure any external connections that mate to this equipment by using

screws, sliding latches, threaded connectors, or other means provided

with this product.

• Do not disconnect equipment unless power has been removed or the

area is known to be nonhazardous.

The following information applies when

operating this equipment in hazardous

locations.

Informations sur l’utilisation de cet équipement

en environnements dangereux.

Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for

use in Class I Division 2 Groups A, B, C, D, hazardous

locations and nonhazardous locations only. Each product is

supplied with markings on the rating nameplate indicating

the hazardous location temperature code. When combining

products within a system, the most adverse temperature code

(lowest “T” number) may be used to help determine the

overall temperature code of the system. Combinations of

equipment in your system are subject to investigation by the

local Authority Having Jurisdiction at the time of installation.

Les produits marqués “CL I, DIV 2, GP A, B, C, D” ne conviennent

qu’à une utilisation en environnements de Classe I Division 2

Groupes A, B, C, D dangereux et non dangereux. Chaque produit

est livré avec des marquages sur sa plaque d’identification qui

indiquent le code de température pour les environnements

dangereux. Lorsque plusieurs produits sont combinés dans un

système, le code de température le plus défavorable (code de

température le plus faible) peut être utilisé pour déterminer le

code de température global du système. Les combinaisons

d’équipements dans le système sont sujettes à inspection par

les autorités locales qualifiées au moment de l’installation.

WARNING

EXPLOSION HAZARD

• Do not disconnect equipment

unless power has been removed or

the area is known to be

nonhazardous.

• Do not disconnect connections to

this equipment unless power has

been removed or the area is known

to be nonhazardous. Secure any

external connections that mate to

this equipment by using screws,

sliding latches, threaded

connectors, or other means

provided with this product.

• Substitution of components may

impair suitability for Class I,

Division 2.

• If this product contains batteries,

they must only be changed in an

area known to be nonhazardous.

AVERTISSEMENT

RISQUE D’EXPLOSION

• Couper le courant ou s’assurer que

l’environnement est classé non

dangereux avant de débrancher

l'équipement.

• Couper le courant ou s'assurer que

l’environnement est classé non

dangereux avant de débrancher les

connecteurs. Fixer tous les

connecteurs externes reliés à cet

équipement à l'aide de vis, loquets

coulissants, connecteurs filetés ou

autres moyens fournis avec ce

produit.

• La substitution de composants peut

rendre cet équipement inadapté à

une utilisation en environnement de

Classe I, Division 2.

• S’assurer que l’environnement est

classé non dangereux avant de

changer les piles.

When In 1794-IRT8 Series A 1794-IRT8, -IRT8XTSeries B

Isolation Between user side and system side Between user 24V dc and user I/O;

Between user side and system side

Common Mode

Range

+4V DC +15V DC

Thermocouple

Mode Wire-off

Detection

When an open sensor is detected, data

defaults to maximum value

When open sensor is detected, data

defaults to minimum value

ATTENTION

To simulate series A module wire-off detection behavior using a series B

module, connect a wire between terminals 39 and 48 on the 1794-TB3G or

1794-TB3GS terminal base unit. If not connected, the Series B module will

default to Series B functionality.

ATTENTION

In RSLogix 5000, if using a series B product to replace a series A product, the

module will be accepted without an electronic keying mismatch warning.

This is true for 1794-IRT8 and 1794-IRT8XT modules installed on Ethernet/IP,

ControlNet, DeviceNet, or Remote I/O networks.

ATTENTION

During mounting of all devices, be sure that all debris (for example, metal

chips or wire strands) is kept from falling into the module. Debris that falls

into the module could cause damage on power up.

WARNING

If you remove or insert the module while the backplane power is on, an electrical

arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding.

ATTENTION

Do not daisy-chain power or ground from this terminal base unit to any AC or

DC digital module terminal base units.

1 2 3 4 5 6

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