Description
- Allen-Bradley 1756-PA75 | Industrial DC Output Supply
Unboxing & Physical Snapshot
- Model & Brand: Allen-Bradley / Rockwell Automation 1756-PA75
- Product Type: ControlLogix AC Power Supply Module. The unit provides chassis backplane power for ControlLogix processor and I/O systems.
- Input Voltage Range: 85–265 VAC, 47–63 Hz
- Approximate Physical Dimensions (W × H × D):
- Approximately 112 × 145 × 140 mm
- Estimated Shipping Weight:
- Module weight: approximately 1 kg
- Typical packaged shipping weight: 2–3 kg
- What’s in the Box:
- Allen-Bradley 1756-PA75 ControlLogix power supply
- AC input terminal interface
- Chassis mounting hardware
- Front status indicator assembly
- Protective packaging
- Anti-static (ESD) protection where applicable
Product Introduction
The Allen-Bradley 1756-PA75 mounts on the left side of a ControlLogix chassis and supplies regulated DC power to the backplane, where processors, communication modules, and I/O cards receive their operating power. This AC-input supply supports ControlLogix systems requiring a 5V backplane output at 13 A, with additional 3.3V and 1.2V output capability (—which is critical for large chassis installations containing multiple communication and processing modules).
Treat this power supply as a controlled electrical asset. Replacement requires more than matching the catalog number. Verify chassis loading, input voltage, power budget calculations, and grounding arrangement before installation. Check the terminal block. Check the chassis series compatibility. A damaged supply can affect every module connected to the rack.
Core Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Family | ControlLogix |
| Model Number | 1756-PA75 |
| Module Type | AC Power Supply |
| Input Voltage | 85–265 VAC |
| Nominal Input Voltage | 120/240 VAC |
| Input Frequency | 47–63 Hz |
| Maximum Input Power | Approximately 100 VA / 100 W |
| Maximum Output Power | 75 W |
| 5.1 VDC Output Current | 13 A |
| 3.3 VDC Output Current | 4 A |
| 1.2 VDC Output Current | 1.5 A |
| 24 VDC Output Current | 2.8 A |
| Isolation Voltage | 250 VAC continuous |
| Backplane Power Supply | Yes |
| Mounting Method | ControlLogix chassis left-side mounting |
| Cooling Method | Natural convection |
| Power Dissipation | Approximately 85.3 BTU/hr |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Weight | Approximately 1 kg |
Allen-Bradley 1756-PA75
? Global Compliance & Industry Certifications
Expected regulatory approvals for the Allen-Bradley 1756-PA75 include:
- CE Mark
- Confirms compliance with applicable European EMC and safety requirements when installed within an approved ControlLogix system.
- UL/cUL Listed
- Supports installation within approved industrial control panels following applicable electrical standards.
- ATEX / IECEx
- Not typically a standalone hazardous-area power supply. Hazardous-area suitability depends on the complete cabinet design, enclosure rating, and certified installation method.
- Marine Approvals (DNV GL)
- May apply to specific certified system configurations. Rockwell lists marine-related certifications for certain ControlLogix power supply variants and configurations.
Power supply certification matters because this module converts incoming AC power into the DC supply rails used by safety-related and control hardware. Incorrect replacement can introduce voltage instability or cabinet-level failures.
Verify specific lot certifications with OEM.
? Long-Term Storage & Asset Preservation Guide
Keep the 1756- inside the original anti-static (ESD) shielding bag whenever possible. Protect the AC terminal area, chassis connector, and ventilation openings from dust accumulation.
Maintain warehouse humidity below 60% RH. Moisture exposure can affect PCB insulation, connector surfaces, and internal power components.
For storage periods exceeding two years, inspect the internal capacitor condition before applying full operating voltage. Older power supplies may require controlled energization procedures after extended shelf time (—especially important for emergency spare racks stored without periodic power checks).
Record the serial number, manufacturing date code, and inspection history on the warehouse asset record.
Physical Installation Prerequisites
- Install the 1756- only on a compatible ControlLogix chassis.
- Mount the power supply on the left side of the chassis.
- Verify chassis power requirements before energizing.
- Confirm AC input voltage matches the supply rating.
- Connect protective earth according to cabinet standards.
- Maintain airflow around the power supply vents.
- Leave approximately 50 mm clearance above and below ventilation paths where required by enclosure design.
- Inspect the backplane connector before installation.
- Tighten terminal connections to the specified torque.
- Perform chassis power verification after startup.
Allen-Bradley 1756-PA75
Buyer’s FAQ (Logistics & Compliance Focus)
Q: What HS Tariff Code is commonly used for the Allen-Bradley 1756-?
A: Industrial PLC power supply modules are commonly reviewed under HS 8504 for electrical power conversion equipment or related control equipment classifications. Some suppliers may declare related PLC component classifications depending on customs interpretation. Confirm the final code with the destination customs broker.
Q: Why does Country of Origin (COO) matter for the 1756-?
A: COO affects customs duty treatment, trade documentation, and traceability requirements. Ensure the commercial invoice, packing list, and certificate of origin contain matching information. Rockwell indicates multiple possible countries of origin depending on manufacturing location.
Q: Is shipping insurance recommended for this power supply?
A: Yes. The unit contains power conversion electronics, capacitors, and precision connectors. Transit impact or moisture exposure may not create visible damage but can affect startup reliability.
Q: Does the 1756- include the latest firmware pre-loaded?
A: No user firmware is normally loaded into this power supply module. It provides electrical power to the ControlLogix chassis rather than executing application logic. Verify hardware compatibility, chassis requirements, and power calculations before installation.
Start Chat
