Allen-Bradley 1756-PA72K – High-Capacity AC Power Supply | ControlLogix Platform
Engineering Background: The 1756-PA72K is a high-capacity AC input power supply designed exclusively for the Allen-Bradley ControlLogix 1756 chassis platform. Engineered by Rockwell Automation, it delivers stable, regulated DC power to the chassis backplane, supporting mission-critical control architectures in heavy industrial environments where power reliability is non-negotiable.
Product Positioning: As the highest-output AC power supply in the ControlLogix 1756 family, the 1756-PA72K is the preferred choice for fully populated chassis configurations (up to 17 slots) running high-density I/O, communication, and motion modules simultaneously. It is the go-to solution for procurement engineers specifying power budgets for large-scale DCS migration, safety system integration, and redundant control architectures.
Complete Technical Specifications
- Catalog Number: 1756-PA72K
- Platform: ControlLogix 1756 Series
- Manufacturer: Allen-Bradley / Rockwell Automation
- Input Voltage: 85–265 VAC (wide-range universal input)
- Input Frequency: 47–63 Hz
- Output – 5 VDC Backplane: 13 A (65 W)
- Output – 24 VDC User Power: 3 A (72 W)
- Total Output Power: 72 W
- Inrush Current: 25 A peak (cold start)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5–95% non-condensing
- Chassis Compatibility: All 1756 ControlLogix chassis (4, 7, 10, 13, 17 slot)
- Slot Occupancy: Occupies 1 slot (leftmost position)
- Certifications: UL, CE, CSA, RCM
- Enclosure Rating: Open type (requires panel/enclosure mounting)
- Weight: Approx. 500 g
- Country of Origin: USA
Proven Application Environments
- Oil & Gas: Upstream/downstream SCADA and ESD systems requiring uninterrupted 24/7 power delivery
- Automotive Manufacturing: High-density robot cell controllers with simultaneous servo drive coordination
- Water & Wastewater: Multi-pump station control with redundant chassis configurations
- Power Generation: Turbine governor and BOP control panels with wide AC input tolerance
- Pharmaceutical: Batch process control systems under FDA 21 CFR Part 11 compliance frameworks
- Mining & Metals: Conveyor and crusher control in high-vibration, wide-temperature environments
Engineering Advantages
- Universal AC Input (85–265 VAC): Eliminates step-down transformers in global deployments; compatible from 100V Japanese grids to 240V European standards
- Highest Output in 1756 AC Family: 13 A @ 5 VDC supports fully populated 17-slot chassis without power budget compromise
- Dual Output Rails: Independent 24 VDC user power rail (3 A) for field device powering without external PSU
- Hot-Swap Capable: Supports chassis power supply replacement without full system shutdown in redundant configurations
- Diagnostic LED Indicators: Real-time OK/Fault status visible from panel front for rapid field troubleshooting
- Conformal Coating (K Suffix): Enhanced PCB protection against moisture, dust, and corrosive atmospheres
System Architecture & Signal Flow
The 1756-PA72K installs into the leftmost slot of any 1756 ControlLogix chassis. AC mains power enters via the IEC-style terminal block on the module face. The internal switching power supply converts AC input to regulated 5 VDC (backplane bus) and 24 VDC (user power bus). The 5 VDC rail powers all logic modules via the chassis backplane. The 24 VDC rail is accessible via front-panel terminals for powering field devices, sensors, or I/O module field-side circuits. A status OK relay output is available for integration into external supervisory monitoring circuits.
In redundant power configurations, two 1756-PA72K units can be installed using the 1756-PSCA2 power supply chassis adapter, providing seamless failover with no interruption to the control program.
Sourcing & Quality Verification
- Source: Konmask.com sources 1756-PA72K units from authorized distributors and verified OEM surplus channels
- Inspection Protocol: Visual inspection, label verification (Rockwell holographic serial label), and functional power-on test prior to shipment
- Traceability: Serial number and date code recorded for every unit; documentation available upon request
- Warranty: 12-month replacement warranty against manufacturing defects
- Counterfeit Prevention: No unverified grey-market sourcing; original Rockwell Automation packaging where available
Procurement Process
- Submit RFQ: Contact [email protected] with quantity, required delivery date, and destination country
- Receive Quote: Pricing and lead time confirmed within 1 business day
- Order Confirmation: Purchase order accepted via email; proforma invoice issued
- Quality Inspection: Unit inspected and photographed before dispatch
- Shipping: DHL / FedEx express worldwide; EXW, FOB, CIF Incoterms available
- Documentation: Commercial invoice, packing list, and test report provided; CO and Form E available on request
Technical FAQ
Q: What is the difference between 1756-PA72 and 1756-PA72K?
A: The “K” suffix denotes conformal coating applied to the PCB assembly, providing enhanced protection against moisture, dust, and corrosive atmospheres. Electrically and functionally identical.
Q: Can the 1756-PA72K power a fully loaded 17-slot chassis?
A: Yes. At 13 A on the 5 VDC rail, it is the highest-output AC supply in the 1756 family and is rated for full 17-slot chassis population, subject to individual module power budgets.
Q: Is this module compatible with ControlLogix 5580 (1756-L8x) controllers?
A: Yes. Compatible with all ControlLogix generations including L5x, L7x, and L8x controllers within the 1756 chassis platform.
Q: What input voltage range is supported?
A: 85–265 VAC, 47–63 Hz. No manual voltage selection required — the supply auto-ranges across all global AC standards.
Q: Do you provide a test report or inspection certificate?
A: Yes. A functional test report is available for every unit. Certificate of Conformance available upon request.
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