Rockwell Automation 1797-PS1E User Manual

Installation Instructions

FLEX Ex 85…253V ac In/Quad-Ex dc Out Power Supply

Catalog Number 1797-PS1E Series B

Top ic Page

Important User Information 2

About the Power Supply 3

Understand System Planning 4

Installation in Zone 1, 22 6

Electrostatic Charge 8

Outputs 8

Mount the 1797-PS1E Power Supply 8

Customer Connections 10

Typical Wiring Configurations 10

rminal Base Assignments 11

1797-PS1E Mounting Dimensions and T

Repair 11

Specifications - 1797-PS1E Power Supply 12

Ferrite Beads 15

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2 FLEX Ex 85…253V 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 t Maintenance of Solid State Controls (Publication SGI-1.1 Automation sales office or online at

http://literature.rockwellautomation.com) describes some important differences between solid state equipment and hard-wired electromechanical devices. Be

cause 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 illus 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 s

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

he Application, Installation and

available from your local Rockwell

respo

nsible or liable for indirect or

trative purposes.

ation, Inc. with respect to use of

or in part, without written permission

fety 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.

1797-5.33 - April 2007

FLEX Ex 85…253V ac In/Quad-Ex dc Out Power Supply 3

ATTENTION

30686

1797-PS1E

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 Supply

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 source is needed to operate any components attached to the

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

FLEX transmitters come from the FLEX Ex modules.

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4 FLEX Ex 85…253V ac In/Quad-Ex dc Out Power Supply

The 1797-PS1E is an 85…253V ac in/quad-Ex dc out power supply in a flame-proof enclosure with increased safety input/output terminations. The 85…253V ac gland is an M20 x 1,5 and can accept a cable from 6…12 mm (0.267…0.472 in.) in diameter. The Ex outputs are M16 x 1,5 and can accept a cable from 4…8 mm (0.157…0.315 in.) in diameter.

Features include the following:

• 85…25

3V 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

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

supp you will need 11 power outputs if you are using the fiber hub, which requires

8.5 W.

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

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

ea supplies were sufficient.

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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

EEx d/e

EEx ib

41306

Unsafe Power Entrance

Spare

Unsafe Power Entrance

EEx d/e

EEx ib

EEx d/e

EEx ib

FLEX Ex 85…253V ac In/Quad-Ex dc Out Power Supply 5

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.

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.

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