Description
1. SEO Titles (5 Variations)
1. SEO Titles (5 Variations)- Allen-Bradley 1756-PBR2 | ControlLogix 24V DC Redundant Power Supply Bundle
- Allen-Bradley 1756-PBR2 | 75W Redundant PLC Power Supply In Stock
- Allen-Bradley 1756-PBR2 | New Surplus Chassis Adapter and Supply Kit
- Allen-Bradley 1756-PBR2 | ControlLogix Dual Power Supply Assembly
- Allen-Bradley 1756-PBR2 | Legacy System High-Availability Power Upgrade
2. At-A-Glance Executive Brief
- Model: 1756-PBR2
- Brand: Allen-Bradley (Rockwell Automation)
- Part Type: ControlLogix Redundant DC Power Supply Bundle (Includes 2x 1756-PB75R, 2x 1756-CPR2 cables, 1x 1756-PSCA2 chassis adapter)
- Lifecycle Status: Active / High-Availability Support Tier
- Input Voltage: 19.2 to 32V DC
- Weight: 6.1 kg (Total bundle weight)
3. Technical Introduction
Plant operators running continuous-flow processes cannot tolerate unannounced control system dropouts caused by single power supply failures in high-density automation racks. Standard single-supply setups leave entire production lines vulnerable to unexpected component wear or sudden input voltage sags. The Allen-Bradley 1756-PBR2 addresses this vulnerability by delivering a complete redundant power supply bundle, utilizing dual hot-swappable modules routed through a dedicated chassis adapter to maintain uninterrupted 5V, 3.3V, and 24V backplane power during primary source maintenance or failure.
4. Core Technical Specifications
| Parameter | Value |
| Input Voltage Range | 19.2…32V DC (Nominal 24V DC) |
| Total Output Power | 75W max (0…60^{\circ}C) |
| Current Capacity @ 5.1V DC | 13 A |
| Current Capacity @ 3.3V DC | 4 A |
| Current Capacity @ 1.2V DC | 1.5 A |
| Current Capacity @ 24V DC | 2.8 A |
| Included Chassis Adapter | 1756-PSCA2 |
| Included Power Supplies | (2) 1756-PB75R |
| Included Interface Cables | (2) 1756-CPR2 |
5. Field Engineer’s Tech Notes
- Hot-Swapping Sequence: When replacing a faulted power supply module within the active 1756-PBR2 assembly, ensure the remaining operational supply is fully seated and displaying a healthy green status indicator before unbolting and extracting the failed unit. Pulling both units simultaneously will drop backplane power and cause a total controller fault.
- Cable Seating and Routing: The 1756-CPR2 interface cables carry high-integrity power signals between the remote supplies and the 1756-PSCA2 chassis adapter. Secure the locking screws on both ends of the cable connectors; loose thumbscrews induce intermittent voltage drops that mimic internal power supply failures.
6. Adaptive QA & Testing Protocol
Every 1756-PBR2 redundant bundle undergoes rigorous bench evaluation prior to stock intake. Technicians mount the 1756-PSCA2 adapter to a test chassis and connect both 1756-PB75R power modules using the 1756-CPR2 cables. Each supply is individually subjected to load simulation across the 5.1V, 3.3V, and 24V rails while verifying automatic load-sharing transitions and fault relay contact closures during simulated primary dropouts. Detailed electrical test logs and video verification are available upon request to satisfy your internal quality assurance audits.
7. Buyer’s FAQ
- Q: What warranty is included with this power supply bundle?A: All New Surplus and fully tested units include a comprehensive 24-month replacement warranty covering hardware performance.
- Q: Does this package include everything required for redundancy installation?A: Yes, the 1756-PBR2 is a complete bundle containing two 1756-PB75R power units, two 1756-CPR2 connection cables, and the 1756-PSCA2 chassis adapter module.
- Q: Can this assembly be retrofitted onto an existing standard ControlLogix chassis?A: Yes, the 1756-PSCA2 adapter mounts onto standard Series B ControlLogix chassis configurations, allowing you to upgrade a single-supply rack to full high-availability redundancy without replacing the backplane.
- Q: What are the transit lead times for emergency plant spares?A: Expedited same-day shipping is available to ensure rapid delivery during unexpected critical outage events.
