1756-PA75K Allen-Bradley ControlLogix 75W Power Module

1756-PA75K Allen‑Bradley ControlLogix AC Power Supply Module

Product Introduction

The 1756-PA75K delivers stable AC power to your ControlLogix chassis. Allen‑Bradley engineered this module for non-redundant applications requiring higher 5.1V current. It accepts a nominal input of 120-240V AC with an operating range of 85-265V AC. The module then provides 75 watts of output power at 60 °C. Four DC voltage rails supply your processor and I/O modules, with 13 amps available at 5.1V DC. Additionally, the 1756-PA75K includes reinforced insulation tested at 3500V DC for 60 seconds.

Key Technical Specifications

The 1756-PA75K operates at an input frequency of 47-63 Hz. Maximum input power reaches 100 VA (100 watts). Inrush current is limited to 20 amperes maximum. Hold-up time varies by input voltage: 2 cycles at 85V AC, 6 cycles at 120V AC, and 20 cycles at 220V AC (all at 60 Hz). The module's current capacity includes four outputs:

• 1.5A at 1.2V DC

• 4.0A at 3.3V DC

• 13.0A at 5.1V DC

• 2.8A at 24V DC

Furthermore, the 1756-PA75K weighs approximately 1.1 kg. Its dimensions are 14.0 x 11.2 x 14.5 cm (5.51 x 4.41 x 5.71 inches). Continuous isolation voltage is rated at 250V AC. Power dissipation reaches 85.3 BTU per hour.

Chassis Compatibility and Mounting

You must install the 1756-PA75K in the leftmost slot of any compatible 1756 chassis. This module requires Series B or Series C chassis. Compatible models include the 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17. The module directly plugs into the backplane. Note that Series A chassis are not supported. Always verify your chassis series before purchasing.

Wiring Requirements

For safe and reliable operation, use 14 AWG (2.5 mm²) copper wire. Both solid and stranded types are acceptable. The insulation must be rated at 90 °C (194 °F) or higher. Wire category for power ports is 1. Tighten the conductor screws to 0.56 N·m (5 lb·in). The module uses an open-type enclosure, so install it inside a suitable cabinet that requires a tool for access.

Protection and Immunity Features

The 1756-PA75K includes several built-in protection features. A non-replaceable fuse protects against fire caused by short circuits. The module tolerates ±10% voltage oscillations for 15 minutes at AC ports. It also withstands over 95% of AC power interruptions. Surge transient immunity protects against conducted RF, radiated RF, and ESD. These features make the 1756-PA75K suitable for harsh industrial environments.

Environmental and Mechanical Ratings

The 1756-PA75K operates in temperatures from 0 to 60 °C (32 to 140 °F) without derating. Storage temperature ranges from -40 to 85 °C (-40 to 185 °F). Relative humidity tolerance is 5% to 95% non-condensing. For vibration, the module withstands 2G at 10-500 Hz. Operating shock rating is 30G, while non-operating shock reaches 50G. The module complies with the T4 North American temperature code and is rated for pollution degree 2 and installation category II.

Certifications and Hazardous Location Approval

The 1756-PA75K holds multiple certifications including UL, CSA, and CE. It is approved for use in industrial hazardous locations. The module meets reinforced insulation standards. Always follow local electrical codes during installation. The open-style design requires final mounting in an enclosure that limits access to trained personnel only.

Installation Guidelines

First, confirm your chassis is Series B or C. Next, power down the chassis completely. Then, align the 1756-PA75K with the leftmost slot guides. Slide the module in until the top and bottom latches click firmly. After that, connect the AC supply wires to the terminal block. Use 14 AWG copper conductors only. Tighten screws to exactly 0.56 N·m. Additionally, verify that ambient temperature stays below 60 °C. Finally, apply power and check that the green status LED illuminates.

Typical Applications

You will find the 1756-PA75K in medium to large ControlLogix systems. It suits manufacturing lines with many I/O modules, process control skids, and material handling systems. The higher 5.1V current (13A) makes it ideal for systems with multiple communication modules or processors. For water treatment plants and conveyor systems, this power supply provides reliable DC power without redundancy.

Packaging List

• 1756-PA75K power supply module – 1 unit

• Removable terminal block (power connector) – 1 piece

• Installation instruction sheet – 1 copy

Note: No certificates or warranty documents are included in the package. The fuse is non-replaceable.

Shipping

We ship via FedEx, UPS, or DHL. Standard transit time is 3–7 business days depending on your destination.

Frequently Asked Questions (FAQ)

1. Can I use the 1756-PA75K with a Series A chassis?
No. The 1756-PA75K requires Series B or Series C chassis. Series A chassis are not compatible.

2. What is the difference between 1756-PA75K and 1756-PA72K?
The 1756-PA75K provides 13A at 5.1V DC, while the 1756-PA72K provides only 10A. Both deliver 75W total output.

3. Is the fuse on the 1756-PA75K replaceable?
No. The internal fuse is non-replaceable. If the fuse blows, you must replace the entire power supply module.

4. What happens during an AC power interruption?
The hold-up time keeps the module running: 2 cycles at 85V, 6 cycles at 120V, and 20 cycles at 220V AC. This prevents unexpected processor resets.

5. Does the 1756-PA75K require derating at high temperatures?
No. This module delivers full 75W output across the entire 0-60 °C operating range without any derating.