PLC ControlLogix 1756-PA75/B Series B AC Power Supply

Overview

Allen-Bradley · ControlLogix

1756-PA75/B 1756-PA75 Series B AC Power Supply

Allen-Bradley 1756-PA75/B is a Series B ControlLogix standard AC power supply for compatible 1756 chassis. It accepts 120 or 240 V AC input and provides up to 75 W of regulated backplane power for installed modules.

At a Glance

Brand	Allen-Bradley
Model	1756-PA75/B
Product Type	ControlLogix Chassis Power Supply
Core Function	Converts plant AC input into regulated ControlLogix backplane power
Application or Compatible Series	ControlLogix standard chassis and supported redundancy systems

Series B Identification

Match the /B series because chassis and redundancy compatibility depends on the hardware series.

Rack Power Budget

Calculate the 1.2 V, 3.3 V, 5.1 V and 24 V backplane loads of every installed module.

Chassis Compatibility

Use only with the specified Series B or Series C standard ControlLogix chassis.

Product Overview

Allen-Bradley 1756-PA75/B is a Series B ControlLogix standard AC power supply for compatible 1756 chassis. It accepts 120 or 240 V AC input and provides up to 75 W of regulated backplane power for installed modules.

Accepts 120 or 240 V AC plant power over the specified 85 to 265 V operating range. Supplies the ControlLogix chassis at 1.2 V, 3.3 V, 5.1 V and 24 V DC. Meets the supply-series requirement for applicable ControlLogix 5560 and 5570 redundancy systems.

Ordering focus: Confirm the /B hardware series, compatible 1756 chassis, 120 or 240 V AC input, 75 W rack load budget, rail currents, redundancy requirements, enclosure and grounding before ordering..

Key Functions

Wide-Range AC Input

Accepts 120 or 240 V AC plant power over the specified 85 to 265 V operating range.

Multi-Rail Backplane Output

Supplies the ControlLogix chassis at 1.2 V, 3.3 V, 5.1 V and 24 V DC.

Series B Redundancy Support

Meets the supply-series requirement for applicable ControlLogix 5560 and 5570 redundancy systems.

Official Specifications

Input Voltage Range	85 to 265 V AC
Nominal Input	120 or 240 V AC, 50/60 Hz
Input Power	100 VA / 100 W maximum
Maximum Inrush Current	20 A
Maximum Output Power	75 W
5.1 V DC Output Current	13 A
24 V DC Output Current	2.8 A
3.3 V DC Output Current	4 A
1.2 V DC Output Current	1.5 A
Isolation Voltage	250 V continuous, reinforced insulation from input to backplane
Operating Temperature	0 to +60 degrees C
Enclosure Type	Open style
Terminal Torque	0.565 N m
Dimensions	140 x 112 x 145 mm
Compatible Standard Chassis	1756-A4/B, A7/B, A10/B, A13/B and A17/B, plus corresponding Series C chassis

Official source:Allen-Bradley official technical data for 1756-PA75/B.

Frequently Asked Questions

Which chassis can use 1756-PA75/B?

Use it with the listed Series B standard chassis or the corresponding Series C chassis after confirming the complete rack configuration.

What AC supply should I provide for 1756-PA75/B?

Provide 120 or 240 V AC at 50/60 Hz within the 85 to 265 V operating range.

How much backplane power can 1756-PA75/B deliver?

The total output is limited to 75 W while each voltage rail must also remain within its current rating.

Can 1756-PA75/B support a ControlLogix redundancy system?

Series B is required for applicable 5560 Series B and 5570 Series B redundancy configurations.

How should I size the cabinet circuit for 1756-PA75/B?

Allow for up to 100 VA input and a 20 A inrush current while meeting the local protective-device requirements.

Can 1756-PA75/B be installed outside an enclosure?

No, the open-style supply requires a suitable industrial enclosure and the specified ambient conditions.

What should I verify before replacing 1756-PA75/B?

Match the hardware series, chassis series, AC input, grounding, terminal torque and calculated load on every backplane rail.

Compatibility & Ordering Notes

Before ordering 1756-PA75/B: Confirm the /B hardware series, compatible 1756 chassis, 120 or 240 V AC input, 75 W rack load budget, rail currents, redundancy requirements, enclosure and grounding before ordering..

Compatibility Checklist

• Use only with the approved ControlLogix standard chassis series.
• Match the Series B requirement of the installed redundancy architecture.
• Provide AC input within 85 to 265 V at 50/60 Hz.
• Keep total backplane consumption below 75 W.
• Check the load on all four individual voltage rails.
• Install the open-style unit in a suitable enclosure at 0 to +60 degrees C.
• Verify protective earth, terminal torque and inrush capability before energizing.

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