Rockwell Automation 1794-OW8, 1794-OW8K, 1794-OW8XT User Manual

FLEX I/O 8 Relay Output Module

WARNING

IMPORTANT

ATTENTION

WARNING

ATTENTION

Cat. No. 1794-OW8, 1794-OW8K, 1794-OW8XT

(Modules with catalog numbers that end in K 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

http://www.literature.rockwellautomation.com) describes some important differences 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.

SGI-1.1 available from your local Rockwell Automation sales office or online at

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.

Installation Instructions

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.

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.

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, or 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 60664-1), at altitudes up to 2000

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR 11. Without appropriate precautions, there may be difficulties with electromagnetic compatibility in residential and other environments due to conducted and radiated disturbances.

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.

m (6562 ft) without derating.

In addition to this publication, see:

• Industrial Automation Wiring and Grounding Guidelines, publication

, for additional installation requirements.

1770-4.1

• NEMA Standard 250 and IEC 60529, as applicable, for explanations

of the degrees of protection provided by enclosures.

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.

To comply with the CE Low Voltage Directive (LVD), this equipment must be powered from a source compliant with the following: Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV).

European Hazardous Location Approval

The following applies when the product bears the Ex 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 Zone 2 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-IN019H-EN-P - January 2011

WARNING

AVERTISSEMENT

ATTENTION

45284

ATTENTION

WARNING

Relay Load Contact Wiring

Return

+24V

24VDC48V

120V

240V

125V

24VDC120VAC240V

Representative Examples of Various Relay Loads

45283

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

Rockwell Automation.

• 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.

• This equipment must be used only with ATEX certified Rockwell

Automation terminal bases.

• 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.

North American Hazardous Location Approval

The 1794-OW8, 1794-OW8K, 1794-OW8XT modules are Hazardous Location approved.

The following information applies when operating this equipment in hazardou s locations:

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.

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.

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.

Allow 25.4 mm (1 in.) of space between adjacent equipment for adequate ventilation.

The module mounts on a 1794 terminal base.

1. Rotate the keyswitch (3) on the terminal base (4) clockwise to position 9 as

required for this type of module.

2. Make certain the flexbus connector (1) is pushed all the way to the left to connect with the neighboring terminal base and 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.

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 (7) with its alignment bar (6) aligned with the groove (5) 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 (4) is locked into the module.

Exposure to some chemicals may degrade the sealing properties of materials used in the following devices: Relay K1 through K8, Epoxy.

It is recommended that the User periodically inspect these devices for any degradation of properties and replace the module if degradation is found.

Simplified Schematic of the Relay Module

Installing Your Relay Output Module

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

Publication 1794-IN019H-EN-P - January 2011

Load power can be obtained from a variety of sources, and can range from +5V…240V AC. Make certain that only 24V DC is applied to the module power terminals on the module terminal base unit. If you are using 220/240V AC power, you must use the 1794-TBN or 1794-TBNF terminal base unit. Maximum voltage allowed is shown below.

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