Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1756-PA72/C |
| Input Voltage | 85–265 VAC, 47–63 Hz |
| Max Input Power | 100 VA / 100 W |
| DC Output Rails | 5.1 VDC @10A; 3.3 VDC @4A; 24 VDC @2.8A; 1.2 VDC @1.5A |
| Mounting Position | Leftmost slot of 1756 chassis |
| Compatible Chassis | 1756‑A4, A7, A10, A13, A17 (A/B/C series) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5%–95%, non-condensing |
| Isolation Rating | Reinforced insulation, 3500V DC test |
| Weight | ~0.95 kg |
| HS Code | 8504401990 |
Product Introduction (Anti-Template)
Operating as the backbone of the ControlLogix platform, this series C power supply delivers stable multi-rail DC power to every module on the 1756 backplane. It fits only the far-left chassis slot and must be sized to match the total power draw of your CPU, communication and I/O cards. Honestly, many plant teams overlook chassis load calculation and overload this unit without realizing the risk of random controller resets.
1756-PA72/C
1756-PA72/C
1756-PA72/C
QC, Procurement & Logistics SOP
- Inbound Verification: Origin trace review and OEM part marking validation. Visual inspection for burnt input terminals, swollen capacitors or physical casing cracks.
- Live Rig Testing: Full power-up sequence, load testing across all DC output rails, overvoltage protection check, and status LED verification. Full test report packaged with each unit.
- QA & Anti-Static Packaging: Unit cleaned and inspected, sealed inside ESD shielding bag, fitted inside rigid shock-resistant carton.
- Global Logistics & Export Compliance: Apply optimized HS code classification to reduce customs hold risk. Secure packaging rated for air or sea freight; commercial invoice and certificate of origin prepared for customs databases.
Technical Pitfalls & Integration Warnings
- Firmware Rev Mismatch. This power supply itself has no firmware, but older A-series chassis backplanes may not report supply health correctly to newer ControlLogix firmware. One food processing plant swapped the unit and spent 8 hours troubleshooting false low-power alarms in the controller diagnostic log.
- DIP Switch / Configuration errors. Incorrect AC line voltage tap selection is not required for this wide-input model, but wrong chassis slot placement will stop operation. A technician installed it in a middle I/O slot and the entire rack failed to power on.
- Wiring/Terminal incompatibility. Undersized field wiring or loose AC terminals create voltage drop and intermittent power cycling. A water treatment facility used too small wire gauge and saw random PLC trips during peak motor startup.
- ESD destruction during unboxing. Internal control circuitry is sensitive. A technician touching the backplane connector pins without a grounded wrist strap can create latent damage that triggers shutdowns under thermal cycling.
Frequently Asked Questions (FAQ)
Q: What lead times apply for international shipments? A: Stocked units ship within 1–3 business days. Air freight transit runs 3–7 days; sea freight takes 25–45 days, though customs clearance in Latin America might add 2–3 days. Q: What export documentation can you provide? A: We prepare commercial invoice, packing list and certificate of origin for customs filing. All documentation matches the declared HS classification. Q: Can I hot-swap this power supply while the ControlLogix rack remains online? A: Hot swapping is not permitted. Removing this supply while powered cuts backplane power, crashes the CPU and halts all control logic execution. Q: Will this fit a 1756-A17 chassis with a full complement of I/O modules? A: Physically yes, but you must calculate total chassis power consumption. If your module load exceeds the supply rating, you will encounter intermittent faults and unexpected rack resets. Q: What is covered under the standard warranty? A: Warranty runs 12 months from shipment date, covering factory-verified hardware defects. Damage from overloading, miswiring or ESD falls outside coverage. Q: Does this model support redundant power operation? A: No. The 1756-PA72/C is a single non-redundant supply. Redundant configurations require separate hardware architecture and different part numbers. Q: Can I use this supply for 24V DC field sensors directly? A: The 24VDC rail is for backplane use only. It is not sized or isolated to power external field transmitters or solenoids.
