Product Details
Product Overview
The 1756-PB50 serves as a high-capacity DC power supply specifically engineered for the Allen-Bradley ControlLogix platform. It converts a nominal 24V DC input into the multiple backplane voltages required by processors, I/O modules, and communication adapters within a 1756 chassis. This module provides the necessary current for high-density configurations, ensuring stable logic-side performance across the entire backplane. We supply this unit as 100% Brand New and factory-original, guaranteeing peak electrical efficiency and system integrity.
Technical Specifications
The 1756-PB50 utilizes a robust switching architecture to maintain stable outputs even during input voltage fluctuations.
| Feature | Specification |
| Input Voltage (Nominal) | 24V DC |
| Input Voltage Range | 18–32V DC |
| Backplane Current Capacity (5.1V) | 8A @ 50 °C / 6A @ 60 °C |
| Backplane Current Capacity (24V) | 2.5A @ 50 °C / 2.0A @ 60 °C |
| Max Inrush Current | 30 Amps |
| Isolation Voltage | 250V Continuous |
| Hold Up Time | 30ms @ 60W / 40ms @ 50W |
| Chassis Location | Left Side (Dedicated Slot) |
| Weight | 1.81 lbs (0.82 kg) |
Engineering Advantages
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Ride-Through Capability: The integrated capacitors provide a hold-up time of up to 40ms. This prevents nuisance controller resets during momentary DC bus brownouts or power transitions, maintaining process uptime in volatile power environments.
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High-Density Current Delivery: This module delivers a substantial 8A at the 5.1V backplane rail. This high output supports fully populated 17-slot chassis containing multiple high-drain communication modules and processors without requiring a secondary power source.
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Thermal Resiliency: The 1756-PB50 features advanced heat dissipation components. It operates at full capacity in ambient temperatures up to 50 °C and supports derated operation up to 60 °C, making it suitable for unconditioned industrial enclosures.
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Direct Chassis Integration: The unit snaps directly into the dedicated power supply slot on the left side of any standard 1756 ControlLogix chassis. This design eliminates external wiring for logic power and ensures a low-impedance connection to the backplane.
FAQs
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Can I use the 1756-PB50 in a redundant power supply configuration?
No. The 1756-PB50 is a standard power supply. For redundant applications, you must use the 1756-PB75R or 1756-PSCA2 adapter system. This module is intended for standalone chassis power.
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What type of fuse or circuit protection do you recommend for the input?
To protect against the 30A inrush current and potential short circuits, install a fast-acting fuse or a high-magnetic trip circuit breaker rated appropriately for the 24V DC supply line.
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Does this module provide power for field-side devices?
No. The 1756-PB50 only provides power to the chassis backplane for internal module logic. You must provide a separate 24V DC source to power field-side actuators, sensors, and I/O terminal blocks.
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How do I verify if the power supply is functioning correctly?
The front panel includes a green "DC Power" LED. If the LED is off, check the 24V DC input terminals for voltage and ensure the module is fully seated in the chassis.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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