AB 1756-PB72
AB 1756-PB72
AB 1756-PB72
AB 1756-PB72
AB 1756-PB72
AB 1756-PB72
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1756-PB72

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Allen-Bradley 1756-PB72 is a 24 VDC ControlLogix power supply that powers the chassis backplane for installed controller, communication and I/O modules.
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Technical specifications for 1756-PB72

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-PB72
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 24 VDC Chassis Power Supply
  • Stock:
    1
  • Nominal input:
    24 VDC
  • Input range:
    18 to 32 VDC
  • Maximum input power:
    95 W
  • Maximum output power:
    75 W at 0 to 60°C
  • 5.1 V backplane output:
    10 A
  • 3.3 V backplane output:
    4 A
  • 1.2 V backplane output:
    1.5 A
  • 24 V backplane output:
    2.8 A
  • Supported chassis:
    1756-A4, 1756-A7, 1756-A10, 1756-A13 and 1756-A17
  • Mounting position:
    Left side of the ControlLogix chassis
  • Dimensions:
    11.2 × 14.0 × 14.5 cm
  • Conductor:
    2.5 mm² (14 AWG) copper, 90°C minimum
  • Terminal torque:
    0.565 N·m
  • Temperature code:
    T4
  • Hold-up time:
    35 ms at 18 V DC; 40 ms at 24 V DC; 40 ms at 32 V DC
  • Enclosure type:
    Open-style
  • Operating temperature:
    0 to 60°C
  • Storage temperature:
    -40 to 85°C
  • Relative humidity:
    5 to 95%, non-condensing
  • Vibration:
    2 g at 10 to 500 Hz
  • Operating shock:
    30 g
  • Weight:
    0.95 kg
  • Tariff Code:
    8504401400
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Chassis Fit Power Wiring Diagnostics Application
  • Accepts an 18 to 32 VDC input for standard ControlLogix chassis power
  • Supplies the documented 5.1 V, 3.3 V, 1.2 V and 24 V backplane rails
  • Mounts at the left side of supported 1756-A4 through 1756-A17 chassis

Allen-Bradley 1756-PB72 is a ControlLogix 24 VDC chassis power supply designed to energize a supported 1756 chassis from a nominal 24 VDC source.

It provides up to 75 W of backplane power, so selection depends on the combined rail demand of every controller, communication and I/O module in the chassis.

Before installation or replacement, verify the power-supply Series, chassis Series, input polarity, branch protection, conductor rating, grounding and calculated backplane load.

Availability, condition, price, and shipping time for 1756-PB72 are confirmed during quotation.

Allen-Bradley 1756-PB72 ControlLogix 24 VDC Chassis Power Supply Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Install the supply at the left side of the supported ControlLogix chassis
  • Match the 1756-PB72 Series with the chassis Series and project hardware record
  • Recalculate every backplane rail before adding or moving chassis modules
  • Use a protected 18 to 32 VDC source with correct polarity and protective earth
  • Use 2.5 mm² (14 AWG) copper conductors rated at least 90°C
  • Tighten the input terminals to the documented 0.565 N·m torque
  • Check loaded input voltage at the supply rather than only at the source
  • Compare the chassis power calculation with each backplane rail limit
  • Inspect supply seating and chassis connectors before replacing installed modules
  • 24 VDC-powered ControlLogix chassis in industrial control cabinets
  • ControlLogix machine-control chassis containing controller, network and I/O modules
  • Distributed ControlLogix stations where a DC plant supply feeds the local chassis
Description
Allen-Bradley 1756-PB72 is a ControlLogix 24 VDC chassis power supply for standard ControlLogix installations.

The supply converts a nominal 24 VDC source into the backplane rails used by the controller, communication and I/O modules installed in the chassis.

Before installation or replacement, confirm the complete catalog number and Series, supported chassis, branch-circuit protection, conductor size, polarity, grounding and total backplane load.
Revisions

Revision Part #

Also known as

1756-PB72 Ser C
1756-PB72/C, Series C, Rev C
Alternative Names
1756PB72 1756 PB72 1756-PB72/C Allen-Bradley 1756-PB72 AB 1756-PB72 ControlLogix 1756-PB72
Technical notes
Allen-Bradley 1756-PB72 requires a verified 18 to 32 VDC source and a chassis power calculation that remains within every backplane rail limit; confirm Series compatibility and input wiring before replacement.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Can Allen-Bradley 1756-PB72 replace an earlier 1756-PB72 without checking the Series?
No. Confirm the complete catalog number, supply Series, chassis Series, connector condition and the installed backplane load before treating it as a direct replacement.
Which chassis can use Allen-Bradley 1756-PB72?
Rockwell Automation lists the 1756-A4, A7, A10, A13 and A17 chassis in Series A, B and C; verify the exact installed chassis and environmental approval.
Why can Allen-Bradley 1756-PB72 power up but the ControlLogix chassis remain unstable?
Measure input voltage under load, confirm polarity and grounding, inspect chassis seating, and compare every backplane rail demand with the supply limits.
Can Allen-Bradley 1756-PB72 be installed in an ordinary chassis slot?
No. It mounts at the left side of the chassis in the dedicated power-supply position rather than consuming a normal module slot.
Does Allen-Bradley 1756-PB72 provide a redundant chassis power arrangement by itself?
No. It is a standard chassis power supply; a redundant-power architecture requires the specifically documented redundant supply and chassis arrangement.
What should be recorded before replacing Allen-Bradley 1756-PB72?
Record the catalog number and Series, chassis model and Series, loaded input voltage, branch protection, grounding, conductor routing and the current chassis power calculation.
How should Allen-Bradley 1756-PB72 be checked after installation?
Verify terminal torque and polarity, measure the loaded input, confirm all modules start without rail faults, review controller diagnostics and observe a controlled power-cycle recovery.

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