Allen-Bradley FLEX Ex 1797-PS2E2 Bedienungsanleitung

Publication 1797-IN535F-EN-P - August 2017

Installation Instructions

FLEX Ex Power Supply

Catalog Number 1797-PS2E2

Topic Page

Important User Information 2

About the Power Supply 3

Understand System Planning 4

Installation in Zone 1, 22 6

Electrostatic Charge 8

Outputs 9

Mount the 1797-PS2E2 Power Supply 10

Customer Connections 11

Typical Wiring Configurations 11

Mounting Dimensions and Terminal Base Assignments for the

1797-PS2E2 Power Supply

Repair 12

FLEX Ex Power Supply, cat. no. 1797-PS2E2 13

Ferrite Beads 15

2FLEX Ex Power Supply

Publication 1797-IN535F-EN-P - August 2017

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

http://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.

WARNING

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.

IMPORTANT

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

product.

ATTENTION

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

SHOCK HAZARD

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

present.

BURN HAZARD

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

temperatures.

FLEX Ex Power Supply 3

Publication 1797-IN535F-EN-P - August 2017

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 sources are needed to operate any components attached to

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

transmitters come from the FLEX Ex modules.

ATTENTION

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.

1797-PS2E2

30686

4FLEX Ex Power Supply

Publication 1797-IN535F-EN-P - August 2017

The 1797-PS2E2 is a 24V dc in/quad-Ex dc out power supply in an

flame-proof enclosure with increased safety input and output terminations.

The 24V dc 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:

•24V dc supply source

•Four channels, 8.5 W output each channel

•Dual power feeds for source input redundancy

•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

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

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

8.5 W.

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

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

supplies were sufficient.

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

FLEX Ex Power Supply 5

Publication 1797-IN535F-EN-P - August 2017

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.

IMPORTANT

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.

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

Ex d/e

Ex ib

Ex d/e

Ex ib

Ex d/e

Ex ib

41306

Unsafe

Power

Entrance

Spare

Unsafe

Power

Entrance

Unsafe

Power

Entrance

6FLEX Ex Power Supply

Publication 1797-IN535F-EN-P - August 2017

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.

Installation in Zone 1, 22

The 1797-PS2E2 power supply has a protection factor of IP65. Refer to the

specifications table for the IS module type.

Application

When installing, commissioning, operating, and maintaining devices or device

components of the FLEX Ex system as intrinsically-safe electrical apparatus

in potentially explosive atmospheres according to EN 60079-11, you must

heed the EC- type examination certificate and the applicable national and

local construction, installation, and operating regulations.

Zone 1

The power supply can be located in Zone 1. The permissible ambient

temperature of -20…70 °C must not be exceeded.

Zone 22

The housing type of the power supply is applicable for use in Zone 22. It

corresponds with the category 3D acc. to directive 94/9 EC and is marked

with a type label accordingly.

WARNING

The power supply cannot be used in an intrinsically safe environment

after its outputs have been exposed to nonintrinsically safe signals.

41307

FLEX Ex Power Supply 7

Publication 1797-IN535F-EN-P - August 2017

Installation and Commissioning

The power supply unit can be located in Zones 1, 2, and 22 as stated on its

label. The output circuits are according to the ignition protection class Ex ib

and can be installed in Zones 1, 2, and 22. When installing, you must heed the

EC- type examination certificate (especially the special conditions) and the

applicable national and local construction, installation, and operating

regulations.

The housing (Ex d) must not be opened (screw cover). Connections are made

in the (Ex e) terminal box.

Install the power feed lines only in the deenergized state. Also follow the

information on the type label, respectively the covers of the terminals.

You can connect and disconnect the intrinsically-safe output terminals during

operation.

All unused cable glands must be covered by appropriate prototype tested Ex e

lead seals to keep the requirement of IP54.

The cover installed on the nonintrinsically-safe screw terminals

(IP30) may be removed only in the deenergized state and must be remounted

after working on these terminals.

Before closing the cover of the (Ex e) wiring box, inspect the seal for any

signs of damage. In case of damage, the seal must be replaced by a new seal

that is identical to the damaged seal.

The power supply housing contains two flanges, which can be connected to a

wall or other structural part by means of fixing screws. Select fixing screws

that ensure secure fixing of the power supply. Consider the condition of

vibration of the power supply when making this selection.

On the (Ex d) housing there is an earthing screw. This screw must be

connected to Earth with a conductor having a minimum of 4 mm² (0.006 in.2)

area. The connection has to be protected against self-opening and corrosion.

Corrosion protection can be achieved by using tinned terminal ends.

Before opening the (Ex e) terminal box (for example, for maintenance

purposes), it must be cleaned of all dust particles to ensure that no dust can

enter the box.

8FLEX Ex Power Supply

Publication 1797-IN535F-EN-P - August 2017

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

ELETROSTÁTICA.

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

last page of these installation instructions.

European Hazardous Location Approval

The following applies to products marked II 2 G

•Are Equipment Group II, Equipment Category 2, and comply with

the Essential Health and Safety Requirements relating to the design

and construction of such equipment given in Annex II to Directive

2014/34/EU. See the EC Declaration of Conformity at

http://www.rockwellautomation.com/products/certification

for details.

•The type of protection is “Ex de [ib] IIC T4 Gb” according

to EN 60079-11.

•Comply to Standards EN 60079-0:2012, EN 60079-1:2007,

EN 60079-7:2007, and EN 60079-11:2012, reference certificate

number DMT 02 ATEX E 253 X.

•Are intended for use in areas in which explosive atmospheres caused

by gases, vapors, mists, or air are likely to occur occasionally. Such

locations correspond to Zone 1 or 2 classification according to ATEX

directive 2014/34/EU.

FLEX Ex Power Supply 9

Publication 1797-IN535F-EN-P - August 2017

IEC Hazardous Location

The following applies to products with the IECEx certification:

•Are intended for use in areas in which explosive atmospheres caused

by gases, vapors, mists, or air are likely to occur only infrequently and

for short periods. Such locations correspond to Zone 1 or 2

classification to IEC 60079-0.

•The type of protection is “Ex de [ib] IIC T4 Gb” according to

IEC 60079-11.

•Comply to Standards IEC 60079-0:2011, IEC 60079-1:2007-04,

IEC 60079-7:2006-07, and IEC 60079-11:2011, reference IECEx

certificate number IECEx BVS 09.0019X.

Special Conditions for Safe Use:

For an ambient temperature above 60 °C, power supplies must be connected

with leads that are designed for a service temperature of at least 80 °C.

Outputs

When using an intrinsically-safe electrical apparatus according to EN

60079-11, the European directives and regulations must be followed.

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

have a common +V line.

IMPORTANT

You cannot interconnect lines because of the intrinsic safety

requirements.

10 FLEX Ex Power Supply

Publication 1797-IN535F-EN-P - August 2017

Mount the 1797-PS2E2 Power Supply

Follow these directions to properly install the 1797-PS2E2 power supply.

Refer to the Installation and Commissioning section, page 7, for important

precautions and considerations.

1. Remove the screws on the cover of the power supply Ex e terminal

box to access the input and output terminals.

2. Thread the blue IS-safe output power wiring through the blue IS

compression seals.

3. Connect the blue IS-safe output power wiring to the output terminals

making sure all connections are tight.

These power supply outputs provide the input power to the FLEX Ex

modules.

4. Thread the hazardous incoming-power wiring through the black

compression seals.

5. Connect the hazardous incoming-power wiring to the input terminals

making sure all connections are tight.

You can daisy-chain the hazardous incoming-power wiring to further

supplies to simplify system wiring.

ATTENTION

Use star washers and nuts to make sure you have a good electrical

connection. Scrape the paint off the back panel in those areas where

grounding bolts will be located.

ATTENTION

Keep hazardous and IS-safe wiring separated in a suitable

fashion. Do not leave long, excess wiring that could bridge

between the hazardous and safe areas.

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