1756-PB50 Allen-Bradley ControlLogix DC Power Supply

Allen-Bradley 1756-PB50 ControlLogix DC Power Supply

Product Introduction

The 1756-PB50 is a standard DC power supply from the ControlLogix series. It provides reliable power to the backplane and connected modules. Its nominal input voltage is 24V DC, with an operating range of 18-32V DC. The maximum inrush current reaches 30 Amperes.

Additionally, this unit offers different current capacities based on temperature. For example, at 5.1V DC, it supplies 8A at 50°C and 6A at 60°C. At 24V DC, it supplies 2.5A at 50°C and 2.0A at 60°C. Therefore, the 1756-PB50 adapts well to varying thermal conditions.

Technical Specifications of the 1756-PB50

Let's examine the key technical parameters in detail.

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

• Max Inrush Current: 30 Amperes

• Isolation Voltage: 250 Volts continuous

• Output Current Capacity:

  • 1.5A at 1.2V DC

  • 2A at 3.3V DC

  • 5.1V DC: 8A @ 50°C / 6A @ 60°C

  • 24V DC: 2.5A @ 50°C / 2.0A @ 60°C

• Max Output Power: 60W at 0-50°C, 50W at 0-60°C

• Hold-Up Time: 30 ms at 60W load (18-32V DC), 40 ms at 50W load (18-32V DC)

Meanwhile, the 1756-PB50 installs only in the left slot of a 1756 chassis. It does not occupy a regular module slot. This design saves space for I/O or communication modules.

Chassis Compatibility and Mechanical Data

This power supply works with many ControlLogix chassis models. Specifically, it supports the following:

• 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

• Relative Humidity: 5% to 95% noncondensing

• Operating Shock: 30g

• Dimensions: 14.0 x 7.8 x 14.5 cm (5.51 x 3.07 x 5.71 in)

• Weight: 0.77 kg (1.7 lbs)

Installation Guidelines for the 1756-PB50

First, disconnect all power sources before starting. Then, locate the leftmost slot of the 1756 chassis. Insert the 1756-PB50 into this dedicated position. 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, observing correct polarity. Tighten the terminal screws firmly.

Finally, apply power and check the status LED. The module is now ready for operation. Do not install this unit inside a sealed enclosure without ventilation.

Packaging List

• 1756-PB50 power supply module (1 unit)

• Removable terminal block

• Quick start guide

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. Can the 1756-PB50 be installed in any chassis slot?
No, the 1756-PB50 must be installed on the left side of the chassis. It does not fit into standard I/O slots.

2. What is the hold-up time feature?
Hold-up time allows the power supply to continue operating briefly when input voltage drops below normal levels. For the 1756-PB50, it lasts 30-40 ms depending on the load.

3. Is this module hot-swappable?
No, you must remove power from the entire chassis before installing or removing the 1756-PB50.

4. What wire type 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).

5. Can I use the 1756-PB50 with older Series A chassis?
Yes, this power supply is compatible with 1756 chassis of Series A, B, and C, including models like 1756-A4/A and 1756-A17/A.