1756-PB30XT Allen-Bradley ControlLogix-XT Power Supply

Allen-Bradley 1756-PB30XT ControlLogix-XT Power Supply

Product Introduction

The 1756-PB30XT belongs to the ControlLogix-XT series from Allen-Bradley. It is specifically designed for extreme temperature applications. This power supply mounts in the left slot of a 1756 chassis. Its nominal input voltage is 24V DC, with a wide range of 18-32V DC. The maximum inrush current reaches 20 Amperes.

Additionally, this module provides multiple DC outputs for different logic levels. For example, it supplies 1.5A at 1.2V, 4A at 3.3V, 8A at 5.1V, and 1.75A at 24V. Therefore, it can power various backplane components reliably. The isolation voltage is rated at 250V continuous.

Technical Specifications of the 1756-PB30XT

Let’s look at the key technical parameters in detail.

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

• Max Inrush Current: 20 Amperes

• Output Current Capacity:

  • 1.5A at 1.2V DC

  • 4A at 3.3V DC

  • 8A at 5.1V DC

  • 1.75A at 24V DC

• Isolation Voltage: 250V continuous

• Max Output Power: 30W at -25°C to 70°C

Meanwhile, the 1756-PB30XT requires a 1756 chassis left slot for installation. It works with XT-rated chassis such as the 1756-A4LXT/B and 1756-A10XT/C.

Mechanical and Environmental Parameters

This power supply is built for industrial harsh conditions.

• Operating Temperature: -25°C to 70°C (-13°F to 158°F) standalone

• Storage Temperature: -40°C to 85°C

• Relative Humidity: 5% to 95% noncondensing

• Operating Shock: 30g

• Dimensions: 14.0 x 11.2 x 14.5 cm (5.51 x 4.41 x 5.71 in)

• Weight: 0.95 kg (2.10 lbs)

Furthermore, it uses 14 AWG stranded or solid copper wire. The wire must be rated at 90°C (194°F) or higher. Maximum insulation thickness is 1.2 mm (3/64 in).

Installation Guidelines for the 1756-PB30XT

First, always disconnect all power before installation. Then, insert the 1756-PB30XT into the leftmost slot of the chassis. Use a screwdriver to secure the module firmly.

Next, connect the DC input wires to the terminal block. Observe correct polarity strictly. After wiring, tighten the terminal screws to 0.56 N·m (5 lb·in). Finally, apply power and verify the LED indicators turn on.

Do not install this unit in an enclosure with restricted airflow. The system must remain open or well-ventilated. Moreover, use only copper wires approved for industrial control panels.

Packaging List

• 1756-PB30XT power supply module (1 unit)

• Terminal block (installed)

• Installation instructions sheet

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

Shipping Information

All orders ship via FedEx, UPS, or DHL. Tracking number provided after dispatch.

Frequently Asked Questions (FAQ)

1. Can I use the 1756-PB30XT with a standard 1756 chassis?
Yes, but for extreme temperature ratings, pair it only with XT-certified chassis like 1756-A7XT/B or 1756-A10XT/C.

2. What happens if the inrush current exceeds 20 Amperes?
The power supply may fail to start or trip the upstream circuit breaker. Therefore, ensure your DC source can handle 20A inrush.

3. Is the 1756-PB30XT hot-swappable?
No, you must remove power before inserting or removing this module. Always power down the chassis first.

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

5. Does this power supply work with 1756 I/O modules in non-XT environments?
Yes, it works electrically. However, the system temperature range will then be limited to standard specifications (0-60°C).