Rockwell Automation 1769-PA2 Bedienungsanleitung

Installation Instructions

Compact I/O Expansion Power Supplies

Catalog Numbers 1769-PA2, 1769-PB2, 1769-PA4,

1769-PB4

About the Power Supplies

Compact I/O power supplies provide 120/240V AC and 24V DC power to modules, which

can be placed to the left or the right side of the 1769 power supply. As many as eight I/O

modules can be placed on each side of the power supply.

Topic Page

Important User Information 2

Environment and Enclosure 3

North American Hazardous Location Approval 4

Install Safety Circuits 4

European Hazardous Location Approval 5

Before You Begin 6

Assemble the System 9

Mount an I/O Expansion Power Supply 11

Verify Your System Power 14

Power Considerations 15

Use a Master Control Relay 17

Schematic (Using IEC Symbols) 18

Schematic (Using ANSI/CSA Symbols) 19

Connect the Power Supplies 19

Connect Field Wires 21

Replace the Fuse 24

Temperature Derating 25

Power Dissipation 28

Specifications 30

Additional Resources 35

2Compact I/O Expansion Power Supplies

Publication 1769-IN028B-EN-P - October 2008

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, when necessary, 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 consequences.

SHOCK HAZARD

Labels may be on or inside the equipment (for example, drive or motor) to alert people

that dangerous voltage may be present.

BURN HAZARD

Labels may be on or inside the equipment (for example, drive or motor) to alert people

that surfaces may reach dangerous temperatures.

Compact I/O Expansion Power Supplies 3

Publication 1769-IN028B-EN-P - October 2008

Environment and Enclosure

Prevent Electrostatic Discharge

ATTENTION This equipment is intended for use in a Pollution Degree 2 industrial environment, in

overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes

up to 2000 meters (6562 ft) without derating.

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 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.

In addition to this publication, see:

•Industrial Automation Wiring and Grounding Guidelines, for additional installation

requirements, Allen-Bradley publication 1770-4.1.

•NEMA Standards publication 250 and IEC publication 60529, as applicable, for

explanations of the degrees of protection provided by different types of enclosure.

ATTENTION 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.

4Compact I/O Expansion Power Supplies

Publication 1769-IN028B-EN-P - October 2008

North American Hazardous Location Approval

Install Safety Circuits

Circuits that are installed on the machine for safety reasons, like overtravel limit switches, stop

push buttons, and interlocks, should always be hard-wired directly to the master control relay.

These devices must be wired in series so that when any one device opens, the master control

relay is de-energized, thereby removing power to the machine.

The following information applies when

operating this equipment in hazardous

locations:

Informations sur l’utilisation de cet

équipement en environnements dangereux:

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.

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.

WARNING 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.

AVERTISSEMENT 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.

WARNING Explosion Hazard - Do not connect or disconnect connectors while circuit is live.

ATTENTION Never alter these circuits to defeat their function. Serious injury or machine damage

could result.

Compact I/O Expansion Power Supplies 5

Publication 1769-IN028B-EN-P - October 2008

European Hazardous Location Approval

1769-PB2, 1769-PB4 Only

European Zone 2 Certification (The following applies when the product bears the Ex or EEx

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 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.

WARNING •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 Allen-Bradley.

•Provisions 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 backplanes.

•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.

ATTENTION This equipment is not resistant to sunlight or other sources of UV radiation.

6Compact I/O Expansion Power Supplies

Publication 1769-IN028B-EN-P - October 2008

Before You Begin

There are some points about power distribution that you should know.

• The master control relay must be able to inhibit all machine motion by removing

power to the machine I/O devices when the relay is de-energized. We recommend

that the controller remains powered even when the master control relay is

de-energized.

• If you are using a DC power supply, interrupt the load side rather than the AC line

power. This avoids the additional delay of power supply turn-off. The DC power

supply should be powered directly from the fused secondary of the transformer.

Power to the DC input and output circuits should be connected through a set of

master control relay contacts.

Perform Periodic Tests of Master Control Relay Circuit

Any part can fail, including the switches in a master control relay circuit. The failure of one of

these switches would most likely cause an open circuit, which would be a safe power-off

failure. However, if one of these switches shorts out, it no longer provides any safety

protection. These switches should be tested periodically to assure they will stop machine

motion when needed.

Compact I/O Expansion Power Supplies 7

Publication 1769-IN028B-EN-P - October 2008

Parts Illustration of a Power Supply

The sample illustrations of a 1769-PA4 power supply let you review the various components

that comprise a power supply, which is attached to a DIN rail.

Item Description

1Bus lever (with locking function)

2a Upper panel mounting tabs

2b Lower panel mounting tabs

3Status Indicator

4Power supply door with terminal identification label

5a Movable bus connector with female pins

5b Stationary bus connector with male pins

6Nameplate label

44716

44717

44718

44719

12a

1769-PA4

7a 7a

7b 7b

8Compact I/O Expansion Power Supplies

Publication 1769-IN028B-EN-P - October 2008

Install an I/O Expansion Power Supply

Compact I/O Expansion Power Supplies are suitable for use in an industrial environment

when installed in accordance with these instructions. Specifically, this equipment is intended

for use in clean, dry environments (Pollution degree 2(1)) and to circuits not exceeding Over

Voltage Category II(2) (IEC 60664-1).(3)

Disconnect the Power

7a Upper tongue-and-groove slots

7b Lower tongue-and-groove slots

8a Upper DIN rail latches

8b Lower DIN rail latches

9Terminal block with finger-safe cover

10 Fuse housing cover for replaceable fuse

11 120V AC or 240V AC line input power selector switch (PA4 only)

12 Removable selector switch label (PA4 only)

(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a

temporary conductivity caused by condensation shall be expected.

(2) Over Voltage Category II is the load level section of the electrical distribution system. At this level transient voltages are

controlled and do not exceed the impulse voltage capability of the product’s insulation.

(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC) designations.

WARNING Remove power before removing or inserting this power supply from the 1769 I/O system.

When you remove or insert a power supply with power applied, an electrical arc may

occur. An electrical arc can cause personal injury or property damage by:

•sending an erroneous signal to your system’s field devices, causing unintended

machine motion.

•causing an explosion in a hazardous environment.

Electrical arcing causes excessive wear to contacts on both the power supply and its

mating connector. Worn contacts may create electrical resistance.

Item Description

Compact I/O Expansion Power Supplies 9

Publication 1769-IN028B-EN-P - October 2008

Assemble the System

1769 Compact I/O power supplies distribute power from either side of the power supply.

The maximum amount of current the system supports in both directions is:

• 1769-PA2, 1769-PB2: 2 amps at 5V DC; 1 amp at 24V DC.

• 1769-PA4, 1769-PB4: 4 amps at 5V DC; 2 amps at 24V DC.

The power supply can be attached to an adjacent I/O module before or after

mounting.

EXAMPLE A 2 amp at 5V DC power supply (1769-PA2, 1769-PB2) can provide 1 amp to the right side

of the power supply and 1 amp to the left. A 4 amp at 5V DC power supply (1769-PA4,

1769-PB4) can provide 2 amps to the right side of the power supply and 2 amps to the

left.

IMPORTANT The maximum amount of current that can be distributed from either side of any 1769

power supply is 2 amps at 5V DC and 1 amp at 24V DC.

This is a limit of the 1769 Compact I/O Bus.

Item Description

1 Upper and lower tongue-and-groove slots

2 Bus connectors

3 Positioning tab

4 Direction of the bus lever of the power supply to the I/O modules

5 End cap terminator

6 End cap bus terminator

44720

44721

10 Compact I/O Expansion Power Supplies

Publication 1769-IN028B-EN-P - October 2008

Follow these steps to assemble the Compact I/O system.

1. Disconnect your line power.

The power supply does not support removal or insertion of modules under power.

2. Check that the bus lever of the power supply to be installed is in the unlocked (fully

right) position.

3. Use the upper and lower tongue-and-groove slots to secure the power supply to an

I/O module.

4. Move the power supply back along the tongue-and-groove slots until the bus

connectors line up with each other.

5. Push the bus lever back slightly to clear the positioning tab.

Use your fingers or a small screwdriver.

6. To allow communication between the controller and the I/O, move the bus lever of

the power supply and its adjacent I/O modules fully to the left until it clicks.

Make sure it is locked firmly in place.

7. Attach an end cap terminator to the last I/O module in the system by using the

tongue-and-groove slots as before.

8. Lock the end cap bus terminator.

WARNING 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.

ATTENTION When attaching expansion I/O power supplies, it is very important that the bus

connectors are securely locked together to ensure proper electrical connection.

IMPORTANT A 1769-ECR or 1769-ECL right or left end cap (respectively) must be used to terminate the

end of the serial communication bus.

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