Rockwell Automation 1797-PS1N User Manual

Installation Instructions

FLEX Ex 85…250V ac In/Quad-Ex dc Out Power Supply

Catalog Number 1797-PS1N

Top ic Page

Important User Information 2

About the Power Supplies 3

Understand System Planning 4

Electrostatic Charge 6

Outputs 6

Mount the 1797-PS1N Power Supply 7

Customer Connections 8

Mounting Dimensions and Termin

797-PS1N

Repair 9

FLEX Ex Power Supply - 1797-PS1N 10

UL, C-UL I/O Entity Parameters 12

FM I/O Entity Parameters 15

Ferrite Beads 18

al Base Assignments for the

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2 FLEX Ex 85…250V ac In/Quad-Ex dc Out Power Supply

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

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 available from your local Rockwell Automation sales office or online at 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 consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illust 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 Auto information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole of Rockwell Automation, Inc., is prohibited.

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

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, and recognize the consequence

http://literature.rockwellautomation.com) describes

respon

sible or liable for indirect or

rative purposes.

tion, Inc. with respect to use of

or in part, without written permission

considerations.

Publication

Labels may be on or inside the equipment to alert people that dangerous voltage may be present.

Labels may be on or inside the equipment to alert people that surfaces may be dangerous temperatures.

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FLEX Ex 85…250V ac In/Quad-Ex dc Out Power Supply 3

ATTENTION

40468

1797-PS1N

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 enclosed equipment. It should not require additional system enclosure when used in locations consistent with the enclosure type ratings stated in the Specifications section of this publication. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings, beyond what this product provides, that are required to comply with certain product safety certifications.

About the Power Supplies

The power supply is an essential component in the operation of an intrinsically safe system. It must isolate the unsafe incoming power from the control system and limit the available energy to IS-safe levels.

No other power sources are needed to operate any components attached to

EX Ex system in the hazardous area. Power for valves, actuators, or

the FL transmitters come from the FLEX Ex modules.

The 1797-PS1N is a 85…250V ac in/quad-Ex dc

t power supply in an explosion-proof enclosure with 1 in. conduit pipe-thread input/output terminations.

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Features include the following:

• 85…250V ac supply source

• Four channels, 8.5 W output each channel

• Outputs are IS galvanically isolated from the source

• All channels are independently IS limited

Understand System Planning

Part of system planning is determining what modules are needed for the application, how many power supplies are needed, how to best partition the system, and where to locate the system cabinets.

A key task in the development cycle is determining the number of power

pply

outputs (thus power supplies) you will need. In the following example,

su you will need eleven power outputs if you are using the fiber hub, which

requires 8.5 W as shown below.

Modules Requires Modules Requires

Fiber hub 8.5 W Two thermocouple inputs 1.6 W each

Two ControlNet adapters 8.5 W each Two digital outputs 7.5 W each

Two analog inputs 7.5 W each Three NAMUR digital inputs 2.8 W each

Two analog outputs 6.3 W each Two counter inputs 4.25 W each

Each power supply has four independent IS power outputs capable of 8.5 W

h. In the above example, we required 11 IS power outputs so 3 power

eac supplies were sufficient.

The total number of power supplies needed depends on the modules used and the total

system configuration. The following illustration shows how this

example may be configured.

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IMPORTANT

IS Pwr

Safe Area

Hazardous Area

1797 power supply

ACNR

Spare

IE8 OE8 IRT8 Spare Spare IJ2 IJ2

ACNR OB4 OB4D IBN16 IBN16 IBN16 IE8 IRT8 OE8

RPA RPFM RPFM

IS 1797 I/O

IS 1797 Fiber Hub

IS Pwr IS Pwr IS Pwr

IS Pwr IS Pwr IS Pwr IS Pwr

43475

Unsafe Power Entrance

Spare

Unsafe Power Entrance

41307

FLEX Ex 85…250V ac In/Quad-Ex dc Out Power Supply 5

Even though modules may be supplied with power from the same power supply output channel, galvanic isolation in the module provides module-to-module galvanic isolation. Depending upon the module type, galvanic isolation (channel-to-channel within the module) may or may not be provided. See the module’s specifications for more information.

Make certain that you only connect intrinsically-safe power supplies to other intrinsically-safe system modules or adapters to maintain the integrity of the intrinsically-safe backplane.

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IMPORTANT

Electrostatic Charge

Protect the system against electrostatic charge. Post a sign near this module.

WARNING Avoid electrostatic charging. ADVERTÊNCIA! PREVENIR CONTRA O ACÚMULO DE CARGA

ELETROSTÁTI

CA.

For your convenience, a sign that can be cut out and posted is included on the

page

last

of these installation instructions.

Outputs

When using an intrinsically-safe electrical apparatus according to NEC 2002 or CEC 2002, the appropriate USA or Canadian codes must be followed.

The channels in the power supply are electrically connected to each other and

a common +V line.

have

You cannot interconnect lines because of the intrinsic safety requirements.

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