1756-PB72K Allen-Bradley ControlLogix DC Power Supply

Allen-Bradley 1756-PB72K ControlLogix DC Power Supply Module

Product Introduction

The 1756-PB72K is a standard DC power supply module from the ControlLogix series. It provides multiple DC voltage levels to the chassis backplane. These levels include 1.2V, 3.3V, 5.1V, and 24V DC. Its nominal input voltage is 24V DC, with a wide operating range of 18-32V DC.

Additionally, this module delivers a maximum output power of 75 Watts at 60°C. The peak input power reaches 95 Watts. The maximum inrush current is 30 Amps. Therefore, the 1756-PB72K suits demanding industrial control applications.

Technical Specifications of the 1756-PB72K

Let's examine the key technical parameters in detail.

• Input Voltage Range: 18-32 Volts DC (nominal 24V DC)

• Max Inrush Current: 30 Amperes

• Input Power: 95 Watts peak

• Output Power: 75 Watts at 60°C (140°F)

• Isolation Voltage: 250 Volts continuous

• Overcurrent Protection: 15 Amperes

• Current Capacity:

  • 1.5A at 1.2V DC

  • 4A at 3.3V DC

  • 10A at 5.1V DC

  • 2.8A at 24V DC

• Hold-Up Time:

  • 35 ms at 18V DC

  • 40 ms at 24V DC

  • 40 ms at 32V DC

Meanwhile, the 1756-PB72K installs only on the left side of a 1756 chassis. It does not occupy a regular I/O slot. This design maximizes space for other modules.

Chassis Compatibility and Mechanical Data

This power supply works with ControlLogix chassis from Series A, B, and C. Specifically, it supports the following chassis models:

• 1756-A4 (Series A, B, C)

• 1756-A7 (Series A, B, C)

• 1756-A10 (Series A, B, C)

• 1756-A13 (Series A, B, C)

• 1756-A17 (Series A, B, C)

Furthermore, here are the mechanical and environmental parameters:

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to 85°C (-40°F to 185°F)

• Relative Humidity: 5% to 95% noncondensing

• Operating Vibration: 5G at 10-500 Hz

• Operating Shock: 30G

• Non-Operating Shock: 50G

• Dimensions: 14.0 x 11.2 x 14.5 cm (5.5 x 4.4 x 5.7 in)

• Weight: 1.1 kg (2.5 lbs)

Immunity Features

The 1756-PB72K includes several immunity protections for industrial environments. These include:

• Surge transient immunity

• Conducted RF immunity

• EFT/B immunity

These features ensure reliable operation near heavy electrical equipment. However, this module is not designed for residential use. It may cause radio interference in domestic settings.

Installation Guidelines for the 1756-PB72K

First, disconnect all power sources before starting. Then, locate the leftmost position of the 1756 chassis. Insert the 1756-PB72K into this dedicated area. Secure it using the captive screws.

Next, prepare the wiring. Use 2.5 mm² (14 AWG) solid or stranded copper wire. The insulation must be rated at 90°C (194°F) or higher. Maximum insulation thickness is 1.2 mm (3/64 in). Connect the DC input wires to the terminal block. Observe correct polarity strictly. Tighten the terminal screws to 0.565-0.8 N·m (5-7 lb·in).

Finally, apply power and verify proper operation. Do not install this unit inside a sealed enclosure without ventilation.

Packaging List

• 1756-PB72K power supply module (1 unit)

• Removable terminal block

• Installation instructions sheet

Note: The package does not include certificates or warranty documents.

Shipping Information

All orders are shipped via FedEx, UPS, or DHL. Tracking information will be provided after dispatch.

Frequently Asked Questions (FAQ)

1. What is the maximum output power of the 1756-PB72K?
The 1756-PB72K delivers up to 75 Watts at 60°C (140°F). At lower temperatures, the output capacity may be slightly higher.

2. Can I install this power supply in any chassis slot?
No, the 1756-PB72K must be installed on the left side of the chassis. It does not fit into standard I/O slots.

3. What is the hold-up time for this module?
Hold-up time varies by voltage level. At 18V DC, it lasts 35 ms. At both 24V and 32V DC, it lasts 40 ms.

4. Is the 1756-PB72K hot-swappable?
No, you must remove power from the entire chassis before installing or removing the 1756-PB72K.

5. What wire size is recommended for DC input?
Use 14 AWG (2.5 mm²) stranded or solid copper wire. The insulation must be rated for at least 90°C (194°F).