Purchase now: Allen-Bradley 1756-PB75R Redundant DC Power Supply
Atlantechdrives provides you the 1756-PB75R, a high-performance redundant DC power supply designed for the most critical 24V DC automation environments. This module allows for the creation of a fail-safe power architecture, ensuring that your ControlLogix system remains online even in the event of a power supply failure or a fault in one of your DC input branches.
- Input Voltage: 18-32V DC
- Configuration: Redundant (Requires 1756-PSCA2)
- Output Power: 75 Watts @ 60 °C
- Backplane Capacity: 13A @ 5.1V DC
- Safety Standards: Designed for high-availability industrial systems
The Power of Redundancy in DC Systems
The 1756-PB75R is the DC equivalent of the PA75R, intended for plants that rely on 24V DC for their control infrastructure. By pairing two 1756-PB75R units with a 1756-PSCA2 adapter, you eliminate the power supply as a single point of failure. The modules work in a «load-sharing» mode, which not only provides redundancy but also reduces the thermal stress on each individual unit, effectively doubling the expected lifespan of the power system. This is an essential upgrade for remote telemetry units (RTUs), offshore platforms, and solar-powered control sites where maintenance access is difficult and reliability is paramount.
Installation Advice: Redundancy Cabling and Grounding
When setting up a redundant DC system with the 1756-PB75R, ensure the diagnostic cables are firmly seated in the 1756-PSCA2 chassis adapter. These cables allow the two supplies to communicate their status to each other. For the best protection against transients, ground the chassis at the provided ground lug using a low-impedance path. If you are using two different battery banks to feed the two 1756-PB75R modules, ensure they share a common ground reference to prevent potential differences that could cause current to flow through the redundancy adapter rather than the backplane.
Maintenance: Monitoring and ESM Health
The 1756-PB75R is designed for decades of service. Maintenance technicians should check the front panel LEDs during every shift: a solid green LED on both units is the required state. If one LED is out, the system is no longer redundant and a replacement should be installed immediately. Use Studio 5000 to monitor the power supply health bits via a communication module. This allows for automated email or SMS alerts if the redundancy is lost. Keeping the modules clean from metallic dust and ensuring the cabinet ventilation is not blocked are the most effective ways to prevent premature capacitor aging.
FAQs
Q: What happens if I don’t use the 1756-PSCA2 adapter?
A: You cannot achieve redundancy without the adapter; the units would simply function as independent, non-redundant supplies.
Q: Is the 1756-PB75R compatible with older L6 processors?
A: Yes, it provides standard backplane voltages compatible with all generations of ControlLogix processors.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This 24V DC high-capacity power supply ensures reliable backplane performance for large racks like the 1756-A17 17-slot chassis.
Maximize system uptime in DC-powered environments by utilizing this redundant supply alongside a 1756-PSCA2 power adapter.
