Allen-Bradley Compact Installation Instructions
Installation Instructions
Original Instructions
Compact I/O Expansion Power Supplies
Catalog Numbers
1769-PA2,1769-PA2K, 1769-PB2,1769-PB2K, 1769-PA4,1769-PA4K,
1769-PB4,1769-PB4K
Topic Page
Summary of Changes 2
Before You Begin 5
Assemble the System 8
Mount an I/O Expansion Power Supply 10
Verify Your System Power 13
Power Considerations 14
Use a Master Control Relay 16
Schematic (Using IEC Symbols) 17
Schematic (Using ANSI/CSA Symbols) 18
Connect the Power Supplies 18
Connect Field Wires 20
Replace the Fuse 23
Temperature Derating 24
Power Dissipation 27
Specifications 29
Additional Resources 33
Compact I/O™ power supplies provide 120/240V AC and 24V DC power to modules, which
you can place 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.
Compact I/O Expansion Power Supplies
Summary of Changes
This publication contains new and updated information as indicated in this table.
Topi c Page
Updated document with current specifications and certifications Throughout
Updated document with new catalog numbers: 1769-PA2K, 1769-PB2K, 1769-PA4K, 1769-PB4K Throughout
North American Hazardous Location Approval
The following information applies when operating
this equipment in hazardous locations.
Produ cts mar ked "CL I , DIV 2, GP A, B, C, D" are su itable 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.
WARNIN G:
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.
Informations sur l’utilisation de cet équipement en
environnements dangereux.
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 l es
autorités locales qualifiées au moment de l' installation.
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 ce t équipemen t inadapté à u ne
utilisation en environnement de Classe I,
Division 2.
• S'assurer que l'environnement est classé
non dangereux avant de changer les
piles.
2 Rockwell Automation Publication 1769-IN028I-EN-P - July 2020
Environment and Enclosure
ATTENTION: This equipment is intended for use in a Pollution Degree 2 industrial environment, in
overvoltage Category II applications (as defined in EN/IEC 60664-1), at altitudes up to 2000 m
(6562 ft) without derating.
This equipment is not intended for use in residential environments and may not provide adequate
protection to radio communication services in such environments.
This equipment is supplied as open-type equipment for indoor use. 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 or be approved for the application if
nonmetallic. The interior of the enclosure must be accessible only by the use of a tool. Subsequent
sections of this publication may contain more information regarding specific enclosure type
ratings that are required to comply with certain product safety certifications.
In addition to this publication, see the following:
• Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1
installation requirements.
• NEMA Standard 250 and EN/IEC 60529, as applicable, for explanations of the degrees of
protection provided by enclosures.
Prevent Electrostatic Discharge
Compact I/O Expansion Power Supplies
, for more
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.
WARNING: EXPLOSION HAZARD
Do not connect or disconnect connectors while circuit is live.
Waste Electrical and Electronic Equipment (WEEE)
At the end of its life, this equipment should be collected separately from any unsorted municipal waste.
Rockwell Automation Publication 1769-IN028I-EN-P - July 2020 3
Compact I/O Expansion Power Supplies
Always hard-wire circuits that are installed on the machine for safety reasons directly to the
master control relay. Examples include overtravel limit switches, stop push buttons, and
interlocks. These devices must be wired in series so that when any one device opens, the master
control relay is de-energized, which removes power from the machine.
ATT EN TI ON : Never alter these circuits to defeat their function. Serious injury or machine damage
could result.
Hazardous Location Approval
Only 1769-PB2, 1768-PB2K, 1769-PB4, and 1769-PB4K power supplies.
European Hazardous Location Approval
The following applies to products marked , II 3 G. Such modules:
• Are Equipment Group II, Equipment Category 3, 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
• The type of protection used is ‘Ex nA IIC T4 Gc’ according to EN 60079-15.
• Comply to Standards EN 60079-0:2012+A11:2013, EN 60079-15:2010, reference certificate number DEMKO 18 ATEX 2140X.
• Modules are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or air or dust mixtures are
unlikely to occur, or are likely to occur only infrequently and for short periods. Such locations correspond to Zone 2 classification
according to ATEX directive 2014/34/EU.
for details.
IEC Hazardous Location Approval
The following applies to products with IECEx certification. Such modules:
• Are intended for use in areas in which explosive atmospheres caused by gases, vapors, mists, or air are unlikely to occur, or are
to occur only infrequently and for short periods. Such locations correspond to Zone 2 classification to IEC 60079-0.
likely
• The type of protection is ‘Ex nA IIC T4 Gc’ according to IEC 60079-15.
•
Comply to Standards: IEC 60079-0:6th edition, IEC-60079-15:4th Edition, reference IECEx certificate number IECEx UL 20.0078X.
4 Rockwell Automation Publication 1769-IN028I-EN-P - July 2020
Compact I/O Expansion Power Supplies
WARNING: Special Conditions for Safe Use:
• This equipment is not resistant to sunlight or other sources of UV radiation.
• This equipment shall be mounted in an ATEX/IECEx Zone 2 certified enclosure with a minimum
ingress protection rating of at least IP54 (as defined in EN/IEC 60529) and used in an
environment of not more than Pollution Degree 2 (as defined in EN/IEC 60664-1) when applied
in Zone 2 environments. The enclosure must be accessible only by the use of a tool.
• This equipment shall be used within its specified ratings defined by Rockwell Automation.
• Provision shall be made to prevent the rated voltage from being exceeded by transient
disturbances of more than 140% of the rated voltage when applied in Zone 2 environments.
• This equipment must be used only with ATEX/IECEx certified Rockwell Automation backplanes.
• Do not disconnect 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.
ATT EN TI ON : This equipment is not resistant to sunlight or other sources of UV radiation.
Before You Begin
There are some points about power distribution that you must 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 operation avoids the additional delay of power supply turn-off. The DC
power supply must be powered directly from the fused secondary of the transformer.
Power to the DC input and output circuits must 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 must be tested periodically to make sure they stop machine motion when needed.
Rockwell Automation Publication 1769-IN028I-EN-P - July 2020 5
Compact I/O Expansion Power Supplies
1
2a
3
4
9
10
2b
1769-PA4
5b
6
5a
7a
7a
8a
8b
7b
7b
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.
Power Supply Components
Item Description
1 Bus lever (with locking function)
2a Upper panel mounting tabs
2b Lower panel mounting tabs
3 Status Indicator
4 Power supply door with terminal identification label
5a Movable bus connector with female pins
5b Stationary bus connector with male pins
6 Rockwell Automation Publication 1769-IN028I-EN-P - July 2020
Compact I/O Expansion Power Supplies
Power Supply Components (Continued)
Item Description
6 Nameplate label
7a Upper tongue-and-groove slots
7b Lower tongue-and- groove slots
8a Upper DIN rail latches
8b Lower DIN rail latches
9 Terminal block with fingersafe cover
10 Fuse housing cover for replaceable fuse
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
(1)
clean, dry environments (Pollution degree 2
Category II
(2)
(IEC 60664-1).
(3)
) and to circuits that do not exceed Over Voltage
Disconnect the Power
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 injur y 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.
(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a temporary conductivity that
is caused by condensation can be expec ted.
(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 insulation of the p roduct.
(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC) designations.
Rockwell Automation Publication 1769-IN028I-EN-P - July 2020 7
Compact I/O Expansion Power Supplies
2
1
1
3
4
5
6
Assemble the System
1769 Compact I/O power supplies distribute power from either side of the power supply.
EXAMPLE A 2 amp at 5V DC power supply (1769-PA2, 1769-PA2K, 1769-PB2, 1769-PB2K) 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-PA4K, 1769-PB4, and 1769-PB4K) can provide 2 amps to the right
side of the power supply and 2 amps to the left.
The maximum amount of current the system supports in both directions is:
• 1769-PA2, 1769-PA2K, 1769-PB2, 1769-PB2K: 2 amps at 5V DC; 1 amp at 24V DC
• 1769-PA4, 1769-PA4K, 1769-PB4, 1769-PB4K: 4 amps at 5V DC; 2 amps at 24V DC
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 condition is a limit of the 1769 Compact I/O Bus.
The power supply can be attached to an adjacent I/O module before or after
mounting.
Power Supply and Adjacent Module Components
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
5End cap terminator
6 End cap bus terminator
8 Rockwell Automation Publication 1769-IN028I-EN-P - July 2020
Compact I/O Expansion Power Supplies
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.
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.
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
align 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.
ATT EN TI ON : When attaching expansion I/O power supplies, it is very important that the bus
connectors are securely locked together to ensure proper electrical connection.
7. Attach an end cap terminator to the last I/O module in the system by using the tongueand-groove slots as before.
8. Lock the end cap bus terminator.
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.
Rockwell Automation Publication 1769-IN028I-EN-P - July 2020 9
Compact I/O Expansion Power Supplies
Power Supply
Compa ct I/O
Compa ct I/O
Compa ct I/O
Compa ct I/O
Top
Bottom
Side
Side
End Cap
End Cap
(1) (2)
50 mm
(2 in.)
50 mm
(2 in.)
Mount an I/O Expansion Power Supply
ATT EN TI ON : During panel or DIN rail mounting of all devices, be sure that all debris (for example,
metal chips, wire strands) is kept from falling into the module. Debris that falls into the module
could cause damage on power up.
Minimum Spacing
Maintain spacing from enclosure walls, wireways, adjacent equipment, and so forth. Allow 50
mm (2 in.) of space on all sides for adequate ventilation.
Item Description
1 This device could be an end cap, controller, adapter, or expansion cable depending on your system configuration.
2 This device could be an end cap or expansion cable depending on your system configuration.
Prevent Excessive Heat
For most applications, normal convective cooling keeps the system within the specified operating
range. Verify that the specified temperature range is maintained. Proper spacing of components
within an enclosure is sufficient for heat dissipation.
In some applications, other equipment inside or outside the enclosure can produce a substantial
amount of heat. In this case, place blower fans inside the enclosure to help with air circulation
and to reduce hot spots near the system
Additional cooling provisions can be necessary when high ambient temperatures are
encountered.
TIP Do not bring in unfiltered outside air. Place the Compact I/O system in an enclosure to protect it from a
corrosive atmosphere. Harmful contaminants or dirt can cause improper operation or damage components.
In extreme cases, you can need to use air conditioning to protect against heat build-up within the enclosure.
10 Rockwell Automation Publication 1769-IN028I-EN-P - July 2020
Compact I/O Expansion Power Supplies
Compa ct I/O
Compact I/O
End Cap
End Cap
Power Supply
For more than 2 modules: (number of modules -1) X 35 mm (1.38 in.)
132
(5.197)
40
(1.58)
70
(2.76)
28.5
(1.12)
35
(1.58)
35
(1.58)
122.6 ±0.2
(4.826 ±0.008)
All dimensions are in mm (in.). Hole spacing tolerance: ±0.4 mm (0.016 in.)
Mount the Panel
Mount the power supply to a panel by using four screws per module. Use M4 or #8 panhead
screws. Mounting screws are required on each power supply panel mounting tab.
ATT EN TI ON : This product is intended to be mounted to a well-grounded mounting sur face such
as a metal panel. Additional grounding connec tions from the power supply's mounting tabs or DIN
rail (if used) are not required unless the mounting surface cannot be grounded. Refer to Industrial
Automation Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1
information.
Panel Mounting Using the Dimensional Template
, for additional
Rockwell Automation Publication 1769-IN028I-EN-P - July 2020 11
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