Allen-Bradley FLEX Ex 1797-PS1E Bedienungsanleitung

Publication1797-5.33 - December 2003

Installation Instructions

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power

Supply

(Cat. No. 1797-PS1E)

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://www.ab.com/manuals/gi) 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 foractual 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.

Allen-Bradley Drives

2FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply

Publication1797-5.33 - December 2003

WARNING Identifies information aboutpracticesor 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 Identifiesinformationaboutpracticesorcircumstancesthatcanleadtopersonalinjuryor

death, property damage, or economic loss. Attentions help you:

•identify a hazard

•avoid a hazard

•recognize the consequence

HOCK HAZARD Labels may be located on or inside the drive to alert people that dangerous voltage may

be present.

BURN HAZARD Labels maybe locatedon or inside the drive to alert people that surfaces may be

dangerous temperatures.

Important User Information

30686

1797-PS1E

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 3

Publication 1797-5.33 - December 2003

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

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

transmitters come from the FLEX Ex modules.

•The 1797-PS1E is a 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 glan is an M20 x 1,5 and can accept a

cable from 6mm to 12mm in diameter. The Ex outputs are M16 x 1,5

and can accept a cable from 4mm to 8mm in diameter.

Features include:

•85-253V ac supply source

•four channels, 8.5W output each channel

•outputs are IS galvanically isolated from the source

•all channels are independently IS limited

ATTENTIO

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.

Allen-Bradley Drives

4FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply

Publication1797-5.33 - December 2003

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

requires 8.5W:

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

each. In the above example, we required eleven IS power outputs so three

power supplies were sufficient.

Modules Requires Modules Requires

Fiber Hub 8.5W Two Thermocouple Inputs 1.6W each

Two ControlNetTM Adapters 8.5W each Two Digital Outputs 7.5W each

Two Analog Inputs 7.5W each Three NAMUR Digital Inputs 2.8W each

Two Analog Outputs 6.3W each Two Counter Inputs 4.25W each

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 5

Publication 1797-5.33 - December 2003

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

afe Area

Hazardous Are

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

EEx d

/e EEx ib

EEx d

/e EEx ib

EEx d

/e EEx ib

41306

nsafe

ower

ntrance

Spare

nsafe

ower

ntrance

Unsafe

Power

Entrance

Allen-Bradley Drives

6FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply

Publication1797-5.33 - December 2003

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-PS1E 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 50020, you must heed the

EC- type examination certificate and the applicable national and local

construction, installation and operating regulations.

Zone 1

The Power Supply unit can be located in Zone 1. The permissible ambient

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

Zone 22

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

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

with a type label accordingly.

ATTENTIO

The power supply cannot be used in an intrinsically safe

environment after its outputs have been exposed to

non-intrinsically safe signals.

41307

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 7

Publication 1797-5.33 - December 2003

Commissioning, Installation

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 EEx 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 (EEx “d”) must not be opened (screw cover). Connections are

made in the EEx “e” terminal box.

Install the Power feed lines only in the de-energized 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 EEx

“e” lead seals to keep the requirement of IP54.

The cover installed on the non-intrinsically safe screw terminals

(IP30) may only be removed in the de-energized state and must be

re-mounted after working on these terminals.

Before closing the cover of the EEx “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 EEx “d” housing there is an earthing screw. This screw must be

connected to Earth with a conductor having a minimum of 4 mm² 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 EEx “e” terminal box (e.g. for maintenance purposes), it

must be cleaned of all dust particles to ensure that no dust can enter the box.

Allen-Bradley Drives

8FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply

Publication1797-5.33 - December 2003

Electrostatic Charge

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

Attention! Avoid electrostatic charge. For your convenience, a sign which

can be cut out and posted is included on the last page of these installation

instructions.

Outputs

When using an intrinsically safe electrical apparatus according to EN50020,

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.

ATTENTIO

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.

•If available, use a static-safe workstation.

•When not in use, store the equipment in appropriate

static-safe packaging.

IMPORTANT You cannot interconnect lines because of the intrinsic safety

requirements.

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 9

Publication 1797-5.33 - December 2003

Mount the 1797-PS1E Power Supply

Follow these directions to properly install the 1797-PS1E power supply. Refer

to the “Commissioning, Installation” section, page 7, for important

precautions and considerations.

1. Remove the screws on the cover of the power supply EEx “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.

ATTENTIO

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.

Allen-Bradley Drives

10 FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply

Publication1797-5.33 - December 2003

6. Replace the lid of the EEx “e” terminal box.

7. Screw the lid back into place making sure all of the screws are tight.

Customer Connections

Typical Wiring Configurations

Vin

out

chassis GND

IS Isolation

Hazardous to IS -V

+V Out

-V

+V Out

-V

+V Out

41315

IS Limiters

Voltage and Current

-V

+V Out

Type of Power Input

IS Power Output

Daisy-chaining

+V, -V

You can use the daisy chain configuration if the

total module power draw is < 8.5W. Otherwise,

power is connected to individual modules.

Combination

Wiring when total module current

power is greater than 8.5W

41316

<8.5W

+V, -V

Other variations are possible depending

upon individual module power.

<8.5W

+V, -V

1797-PS1E

Hazardous

incoming

power

IS safe

output power

Keep wires separate

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