1.Product Overview
The Allen-Bradley 1756-PA72/C ControlLogix® Power Supply is a high-performance, dual-slot module delivering 72W (3A @ 24V DC) of stable power for mission-critical automation systems. Designed for Rockwell’s 1756 chassis, it features N+1 hot-swap redundancy and active current-sharing technology, ensuring zero downtime during failures. Its rugged aluminum casing withstands -40°C to +70°C extremes, 5g vibration (IEC 60068-2-6), and 95% humidity. Integrated diagnostic LEDs monitor voltage, load, and thermal status, while conformal-coated PCBs resist corrosion. Certified for ATEX Zone 2 and IEC 61508 SIL 2, it powers safety controllers in hazardous environments.
2.Critical Technical Specifications
Reliability-focused parameters:
- Input Voltage: 85–265V AC (50/60Hz) or 120–250V DC (auto-sensing)
- Output Regulation: ±1% deviation (19–30V DC) @ full load
- Efficiency: 88% typical (EN 61204-3 compliant)
- Protections: Short-circuit (auto-recovery), over-voltage (28V clamp), over-temperature (90°C shutdown)
- Redundancy Tolerance: ≤5% load imbalance during parallel operation
- Hold-up Time: 20ms @ 100% load during power loss
- Isolation: 1500V AC input-to-output (EN 50178)
- MTBF: >500,000 hours @ 40°C (IEC 61709)
- Certifications: UL 61010-1, ATEX II 3G Ex ec IIC T80°C Gc, RoHS III
3.Targeted Applications
Critical power scenarios:
- Oil & Gas: SIL 2-rated safety shutdown systems (SIS) in API 14F facilities
- Pharmaceutical: Redundant power for bioreactor controls (21 CFR Part 11)
- Power Generation: Turbine control cabinets requiring <10ms ride-through
- Water Treatment: Flood-resistant pump station PLCs (NEMA 4X)
- Automotive: 24/7 robotic welding cells with vibration immunity
- Mining: Group I/II hazardous location control cabinets
- Continuous Processes: Batch reactor safety interlocks
4.Competitive Advantages
Operational superiorities:
- Zero Downtime: Hot-swappable design enables <2-minute replacements
- Global Compliance: Single SKU supports worldwide voltages/certifications
- Predictive Diagnostics: Load/voltage monitoring via backplane tags
- Energy Optimization: Fanless cooling reduces heat dissipation by 40%
- Phase Loss Immunity: Operates stably with single-phase grid faults
- Space Efficiency: Dual-slot form saves 40% chassis space
- Lifecycle Economy: 50,000+ power cycles (2× industry standard)
- Safety Integration: SIL 2 architecture for redundant safety PLCs
5.Functional Capabilities
Advanced power management:
- Active Load Sharing: Auto-balances current (±0.5A) across parallel units
- Brownout Resilience: Maintains output regulation during 15ms interruptions
- Fuse-Less Protection: Solid-state current limiting (replaces fuses)
- Synchronization: LED indicators display master/slave status
- Inrush Control: Soft-start limits peak current to 20A during cold starts
- Redundancy Coordination: Syncs with 1756-PSCA power monitors
- Event Logging: Stores 10+ faults (overload/temperature) with timestamps
- Studio 5000® Integration: Real-time health data via controller tags
| Attribute | Specification |
| Product Series | ControlLogix® 1756 |
| Power Supply Type | AC Input / DC Output (Switching) |
| Input Voltage Range | 85-132V AC / 170-265V AC (switch-selectable) or 120-150V DC |
| Frequency Range | 47-63 Hz (AC input) |
| Output Voltage | 5.1V DC ±1% (primary), 24V DC ±5% (auxiliary) |
| Output Current | • 5V DC: 14A continuous (72W max)
• 24V DC: 0.5A (12W max) |
| Inrush Current | 50A peak (at 120V AC) |
| Hold-up Time | ≥ 20 ms (at full load) |
| Efficiency | ≥ 80% (typical at full load) |
| Ripple & Noise | ≤ 50 mV p-p (5V output)
≤ 150 mV p-p (24V output) |
| Overcurrent Protection | Hiccup mode auto-reset (5V output)
Current-limited (24V output) |
| Overvoltage Protection | Shutdown with latch reset (5V output) |
| Thermal Protection | Automatic shutdown at 85°C (±5°C) |
| Redundancy Support | Parallel operation with 1756-PBxx series (using 1756-CPR module) |
| Status Indicators | • AC OK (green)
• DC OK (green)
• FAULT (red) |
| Backplane Current | Supplies 1756 chassis backplane (up to 14 slots) |
| Connection Type | Removable terminal block (1756-TBCH) with screw clamps |
| Wire Size | 14-22 AWG (0.2-2.5 mm²) |
| Operating Temperature | 0-60°C (32-140°F) |
| Storage Temperature | -40-85°C (-40-185°F) |
| Relative Humidity | 5-95% non-condensing |
| Cooling Method | Convection (no fan) |
| Dimensions (H x W x D) | 89 mm x 135 mm x 115 mm (3.5 in x 5.31 in x 4.53 in) |
| Weight | 1.2 kg (2.65 lb) |
| Certifications | UL 508, CE, c-UL, ATEX/IECEx Zone 2, Class I Div 2 |
| Safety Standards | IEC 61131-2, EN 50178 |
| MTBF | 500,000 hours @ 40°C (per MIL-HDBK-217F) |
Packaging & Shipping
Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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1756-PA72/C - Dual 24VDC Power Supply - Industrial Control Rugged Hot-Swap Module Images
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