Configured for power distribution in CompactLogix network platforms, the Allen-Bradley 1768-PB3 (1768-PB3 Power Supply Module) provides direct physical/electrical execution.

Module Identification

The 1768-PB3 is a dedicated power supply module engineered for the 1768 CompactLogix platform. It functions as the primary energy source for backplane communication and I/O module operation. The physical design supports DIN-rail or panel mounting configurations, allowing for integration into standard control cabinets. Technical parameters such as input voltage range and output characteristics are fixed to ensure compatibility with 24 VDC industrial control environments.

Hardware Specifications

Deterministic Power Regulation

The power module facilitates consistent backplane bus communication velocity by ensuring stable voltage regulation, which is required for high-density I/O configurations. By maintaining a constant 24 VDC output, the unit supports the deterministic timing required for EtherNet/IP networks and other control architectures, minimizing voltage-drop-related scan-time jitter. The module accommodates variations in input voltage while maintaining the specified output regulation, ensuring I/O module operation remains synchronized with the primary controller execution cycle.

Ordering info

• 1x 1768-PB3 Power Supply Module

• Industrial installation manual

• Terminal block protective cover

Field Installation Guidelines

Mount the 1768-PB3 on a 35 mm DIN rail or directly to the panel using the designated screw holes. Ensure a minimum clearance of 50 mm above and below the module to facilitate thermal dissipation, respecting the operating temperature range of 0 deg C to 60 deg C. For high-vibration applications, ensure the module is securely fastened to a rigid panel surface to maintain the 5 g vibration rating at 10 to 500 Hz. Connect the input 24 VDC source to the designated terminals, observing correct polarity to prevent reverse voltage damage. Ground the module through the chassis mounting hardware to the cabinet's main earth bus.

Delivery Logistics

Delivery time: 2-7 days when payment finish. Dispatch is managed via DHL, FEDEX, or UPS. Each unit is housed in specialized anti-static industrial packaging to mitigate electromagnetic interference and prevent mechanical impact during transit.

Frequently Asked Questions

Q: Can the 1768-PB3 be replaced while the system is powered?

A: No. Standard industrial safety practices dictate that power must be disconnected from the supply module prior to removal or insertion to prevent arcing and potential damage to the backplane pins.

Q: What is the significance of the 8-12 ms hold-up interval?

A: This interval defines the duration the module maintains output voltage within tolerance during a transient loss of input power (1.25 W load), allowing the system to maintain logic states during minor power dips.

Q: Can multiple 1768-PB3 modules be used in parallel?

A: No. Parallel operation of power supply modules is not supported for this hardware; ensure the total backplane current draw does not exceed the capacity of a single module.

Q: What determines the maximum number of I/O modules supported by this power supply?

A: The capacity is defined by the total power consumption (W) and backplane current (A) required by the combined load of the CPU and all connected I/O modules.