Allen-Bradley 1769-PB4 Compact I/O Power Supply Overview

The Allen-Bradley 1769-PB4 is a Compact I/O power supply module. Specifically, it belongs to the 1769 Compact I/O family from Rockwell Automation. Therefore, this module powers adjacent I/O modules in a CompactLogix system. Consequently, users select the 1769-PB4 when a 24 VDC input source is available. Moreover, the unit supports up to 8 modules on each side. Finally, it mounts on a DIN rail or directly on a panel.

Technical Specifications of 1769-PB4

The Allen-Bradley 1769-PB4 has a nominal input voltage of 24 VDC. Specifically, the input voltage range is 19.2 to 31.2 VDC. Current capacity at 5 VDC is 4.0 Amps for logic power. Current capacity at 24 VDC is 2.0 Amps for field power. Power consumption is 100 VA at 24 VDC input. Power dissipation reaches 14.5 Watts at 60°C (140°F). Maximum inrush current is 30 Amps at 31.2 VDC.

Isolation voltage is 75 Volts continuous with reinforced insulation. IEC Class 1 grounding is required for safe operation. Routine testing is performed at 1697 VDC for 1 second. This test applies from DC power input to the system. The internal fuse is field replaceable. Fuse type is Wickmann 19193-6.3A or Littelfuse 021706.3MXP.

The 1769-PB4 has a power supply distance rating of 8 modules. Up to 8 modules can connect on either side of this supply. Therefore, the maximum total modules supported is 16. Module dimensions are 118 mm height x 70 mm width x 87 mm depth. In inches, this measures 4.65 x 2.76 x 3.43 inches. Weight is 630 grams or 1.39 pounds. Enclosure type is open for installation inside a cabinet.

Wire type requires copper rated for 90°C minimum. Solid wire size ranges from 22 to 14 AWG. Stranded wire size ranges from 22 to 16 AWG. Maximum insulation thickness is 1.2 mm (3/64 inch). Operating temperature ranges from 0°C to 60°C (32°F to 140°F). Non-operating temperature ranges from -40°C to 85°C (-40°F to 185°F). Relative humidity is 5% to 95% non-condensing.

Environmental and Immunity Specifications

The Allen-Bradley 1769-PB4 meets rigorous industrial immunity standards. Radiated RF immunity is 10 V/m from 80 to 2000 MHz. This uses 1 kHz sine-wave with 80% AM modulation. At 900 MHz, immunity uses 200 Hz 50% Pulse with 100% AM. At 1890 MHz, the same pulse modulation applies. From 2000 to 2700 MHz, immunity returns to 1 kHz sine-wave. EFT/B immunity is ±2 kV at 5 kHz on DC power ports.

Maximum operating altitude is 2000 meters (6562 feet). Operating vibration is 5g at 10 to 500 Hz. Operating shock is 20g for DIN rail mounting. For panel mounting, operating shock is 30g. Non-operating shock is 30g for DIN rail mounting. For panel mounting, non-operating shock is 40g.

Installation Guidelines for Allen-Bradley 1769-PB4

First, mount the 1769-PB4 on a DIN rail or panel. Then, secure the module using the built-in locking mechanism. After that, connect up to 8 modules to the left side. Next, connect up to 8 modules to the right side. Subsequently, connect the 24 VDC input power to the terminals. Finally, apply power and verify proper operation.

First, shut off all power before wiring the module. Then, use 14 AWG copper wire for the DC input. After that, connect the positive wire to the VDC terminal. Connect the negative wire to the COM terminal. Connect the ground wire to the PE terminal. Do not exceed the 4.0A capacity at 5VDC. Finally, verify total module current does not exceed supply ratings.

Package Contents of 1769-PB4

Your shipment includes these items:

One Allen-Bradley 1769-PB4 power supply module

One product installation instructions manual

One terminal block label for identification

However, the package does not include the internal replacement fuse. Therefore, order the Wickmann or Littelfuse fuse separately. Also, no mounting hardware is provided with this module. Finally, DC input cables are not included in the shipment.

Frequently Asked Questions about 1769-PB4

1. How many modules can the 1769-PB4 power?

The Allen-Bradley 1769-PB4 supports up to 16 I/O modules total. Specifically, 8 modules can mount on each side of the power supply. Therefore, calculate your total current draw before adding modules. The 4.0A at 5VDC and 2.0A at 24VDC are the limits.

2. What is the input voltage range for the 1769-PB4?

The 1769-PB4 accepts 19.2 to 31.2 VDC input. Specifically, the nominal voltage is 24 VDC. Therefore, 12V battery systems are not compatible with this module. Use a 24V nominal supply for proper operation.

3. Does the 1769-PB4 have a replaceable fuse?

Yes, the Allen-Bradley 1769-PB4 has a field-replaceable internal fuse. Specifically, use Wickmann 19193-6.3A or Littelfuse 021706.3MXP. Therefore, order these fuses as spare parts for maintenance. Replace the fuse only when power is completely removed.

4. What is the power supply distance rating on the 1769-PB4?

The 1769-PB4 has a power supply distance rating of 8 modules. Specifically, install the power supply within 8 slots of any module. Therefore, place the supply near the center of your I/O bank. This ensures proper voltage delivery to all modules.

5. Can the 1769-PB4 be panel mounted?

Yes, the Allen-Bradley 1769-PB4 supports both DIN rail and panel mounting. Specifically, panel mounting allows higher shock tolerance of 30g. DIN rail mounting offers 20g shock tolerance instead. Choose the method that suits your application environment.

Compatibility and Application Notes

The Allen-Bradley 1769-PB4 works with all 1769 Compact I/O modules. Specifically, it powers CompactLogix controllers and I/O banks. Use this power supply when only 24 VDC is available onsite. The unit cannot accept 120 VAC or 230 VAC input directly. UPC number is 10612598276896. The enclosure is open type for cabinet installation only. HS code for customs is 85044000. Finally, store the module in a clean, dry environment before installation. Allen-Bradley and Rockwell Automation manufacture this product in the USA.