Rockwell Automation 1794-IJ2XT User Manual

Installation Instructions

FLEX I/O 2 Input Frequency Module

Cat. No. 1794-IJ2, 1794-IJ2K, and 1794-IJ2XT

(Modules with a K in the last position of the catalog number are conformally coated to meet noxious gas requirements of ISA/ANSI-71.040 1985 Class G3 Environment.)

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 online at http://literature.rockwellautomation.com between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we use notes to make you aware of safety considerations.

WARNING

IMPORTANT

ATTENTION

available from your local Rockwell Automation sales office or

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

Identifies information that is critical for successful application and understanding of the product.

Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you:

• identify a hazard

• avoid a hazard

• recognize the consequence

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes up to 2000 meters (6562 ft) without derating. This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance. This equipment is supplied as open-type equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The enclosure must have suitable flame-retardant properties to prevent or minimize the spread of flame, complying with a flame spread rating of 5VA, V2, V1, V0 (or equivalent) if non-metallic. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications. In addition to this publication, see:

• Industrial Automation Wiring and Grounding Guidelines, for additional installation requirements, Allen-Bradley publication 1770-4.1

• NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosure.

) describes some important differences

WARNING

ATTENTION

If you insert or remove the module while 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.

If you connect or disconnect wiring while the field-side 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.

Personnel responsible for the application of safety-related Programmable Electronic Systems (PES) shall be aware of the safety requirements in the application of the system and shall be trained in using the system.

Do not remove or replace a Terminal Base unit while power is applied. Interruption of the backplane can result in unintentional operation or machine motion.

FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc plated yellow-chromate steel DIN rail to assure proper grounding. The use of other DIN rail materials (for example, aluminum or plastic) that can corrode, oxidize, or are poor conductors, can result in improper or intermittent grounding. Secure DIN rail to mounting surface approximately every 200 mm (7.8 in.) and use end-anchors appropriately.

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component boards.

• Do not touch circuit components inside the equipment.

• Use a static-safe workstation, if available.

• Store the equipment in appropriate static-safe packaging when not in

use.

To reduce susceptibility to noise, power analog modules and digital modules from separate power supplies. Do not exceed a total length of 9.8 ft (3m) for dc power cabling.

European Hazardous Location Approval

The following frequency input modules are European Zone 2 approved: 1794-IJ2, 1794-IJ2K, and 1794-IJ2XT

European Zone 2 Certification (The following applies when the product bears the Ex or EEx Marking)

This equipment is intended for use in potentially explosive atmospheres as defined by European Union Directive 94/9/EC and has been found to comply with the Essential Health and Safety Requirements relating to the design and construction of Category 3 equipment intended for use in potentially explosive atmospheres, given in Annex II to this Directive. Compliance with the Essential Health and Safety Requirements has been assured by compliance with EN 60079-15 and EN 60079-0.

Publication 1794-IN049D-EN-P - January 2009

WARNING

ATTENTION

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.

To comply with the CE Low Voltage Directive (LVD), all connections to this equipment must be powered from a source compliant with the following:

Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV).

North American Hazardous Location Approval

The following frequency input modules are North American Hazardous Location approved: 1794-IJ2, 1794-IJ2K, and 1794-IJ2XT.

The following information applies when operating this equipment in hazardous loca tions:

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.

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.

Informations sur l’utilisation de cet équipement en environnements dangereux :

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.

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.

Installing Your Frequency Input Module

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

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.

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.

Connecting Wiring for the 1794-TB3G, and -TB3GS

ATTENTION

Connect wiring as shown here.

To reduce susceptibility to noise, power analog modules and digital modules from separate power supplies. Do not exceed a length of 3 m (9.8 ft) for DC power cabling.

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

DC digital module terminal base units.

Wiring Connections for the Frequency Input Module using the 1794-TB3G or -TB3GS Terminal Base Unit

Wiring Connections for the 1794-TB3G and -TB3GS

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

3V 6V 24V

Chassis Ground

+V COM

24V dc Supply In

+24V dc = Terminals C-34 and C-50 COM = C-35 and C-51 Chassis Ground = Terminals B-16, B-33, C-38, C-40 thru 45, and C-47 NC = No connection

For daisy-chaining: Supply in - C-34 (+) and C-35 (-)

RET 50

500/50

F 24V

24V

500/50

PWR

SEL

Channel 0 Frequency Input

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

NC NC

RET 50

500/50

RET

Channel 0 Gate Input

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Channel 0 Output Supply

SEL

Chassis

Sply0 Sply0

Ground

RET

mV SEL

Chassis Grounds for Shields

PWR

G 24V

PWR

24V PWR

mV SEL Channel 1 Frequency Input

GOUT 0 OUT 0

Channel 1 Gate Input

mV SEL

RET50

500/50

SEL

Sply1 Sply1

Channel 1 Output Supply

24V PWR

Chassis Ground

Supply out - C-50 (+) and C-51 (-)

3V6VRET50

Chassis

OUT 1 OUT 1

Ground

RET

+V COM

RET

24V dc Supply Out

(1794-TB3G shown)

ATTENTION

During mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage on power up.

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

Publication 1794-IN049D-EN-P - January 2009

Output Alarm Connections

Channel 0 Terminals

Sply + Sply

RET

Out + Out

RET

Channel 1 Terminals

Sply + Sply

RET

Out + Out

RET

Supply C-37 C-39 C-46 C-48 Output B-17 B-18 B-31 B-32 1 Connect cable shields to GND connections.

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