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Key Technical Specifications
| Parameter | Value / Specification |
| Catalog Number | 1769-PB4 |
| Input Voltage Range | 19.2 to 31.2V DC (24V DC nominal) |
| Inrush Current (Max) | 30 A @ 31.2V DC |
| Output Real Power | 68 W total |
| Backplane Current Capacity | 4.0 A @ 5.1V DC, 2.0 A @ 24V DC |
| Power Supply Distance Rating | Acts as bank power source (supports up to 8 modules on either side depending on current load) |
| Isolation Voltage | 2650V DC for 1 second (input-to-backplane) |
| Fuse Protection | Internal non-replaceable input fuse |
| Wire Size | 22 to 14 AWG solid/stranded copper wire |
| Dimensions | 118 x 70 x 87 mm (4.65 x 2.76 x 3.43 in) |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
Product Introduction & Supply Chain Strategy
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Allen-Bradley 1769-PB4 is a high-capacity 24V DC-powered expansion power supply designed to deliver regulated 5.1V DC logic power and 24V DC auxiliary power to 1769 Compact I/O backplane banks. It is especially suited for mobile equipment, remote control cabinets, and DC-powered processing skids where AC supply voltage is unavailable.
Maintaining a factory-fresh 1769-PB4 in reserve is vital for maintaining plant uptime. Power supplies are subjected to continuous thermal and electrical stress. Refurbished or second-hand power supply modules carry severe failure risks: degraded filter capacitors and heat-stressed switching transistors often cause voltage ripple, erratic backplane noise, and unprovoked controller resets. Installing genuine New Surplus hardware ensures stable DC bus power delivery, maintains strict noise immunity across long expansion banks, and maximizes Total Cost of Ownership by averting unexpected multi-module shutdowns.
Installation & Configuration Guide
1.Pre-Installation (Prep & Safety):Safety warning: De-energize incoming 24V DC feeder lines before touching power terminals.
Isolate the primary 24V DC incoming supply line using strict Lock-Out/Tag-Out (LOTO) procedures. Connect a grounded anti-static wrist strap before touching module connections. Verify wire gauge rating (14–22 AWG) and check that terminal block covers are intact.
2.Removal:
Unscrew input wiring from the terminal strip (+24V DC, -24V DC return, and chassis ground). Disengage the top and bottom bus levers on the adjacent 1769 I/O modules on both sides. Unlatch the DIN rail retention clips and pull the module straight forward off the rail.
3.Installation (Clone & Seat):
Unpack the New Surplus 1769-PB4 module inside an ESD-safe workspace. Align the module on the 35 mm DIN rail adjacent to the 1769 backplane bank. Slide the module flush against adjacent modules and snap both top and bottom bus levers closed to engage backplane interconnects. Reconnect input wiring observing strict polarity (+24V to DC+, -24V to DC-).
4.Power-On & Testing:
Energize the incoming 24V DC supply line. Observe the front panel PWR LED: confirm it turns solid green, indicating proper internal DC-DC converter operation. Measure backplane supply voltage across test points if necessary and verify all attached I/O modules complete their startup sequence without backplane fault indications.
1769-PB4
Firmware/Software Versions & Upgrade Notes
- Firmware Dependency: None (passive system power regulation unit).
- Power Budget Calculation: When adding high-density analog or communication modules (such as 1769-SDN or 1769-ASCII) to a CompactLogix bank, use the RSLogix 5000 / Studio 5000 system tool to perform a total backplane power budget calculation. Ensure total 5.1V DC and 24V DC current demands do not exceed the 4.0 A and 2.0 A limits of the 1769-PB4.
- Expansion Cable Integration: When bridging multiple 1769 expansion banks using 1769-CBL expansion cables, a dedicated power supply (such as the 1769-PB4 or 1769-PA4) must be installed in each additional bank.
Frequently Asked Questions (FAQ)
What is the primary difference between the 1769-PB2 and the 1769-PB4?
The 1769-PB4 provides significantly higher output current (4.0 A @ 5.1V DC and 2.0 A @ 24V DC) compared to the 1769-PB2 (2.0 A @ 5.1V DC and 0.8 A @ 24V DC). The 1769-PB4 is designed for larger expansion banks or banks containing high-power-draw modules.
Why is buying a New Surplus 1769-PB4 better than choosing a cheaper refurbished module?
Power supplies generate significant internal heat. Refurbished 1769-PB4 units typically retain aged electrolytic capacitors that have lost capacitance, resulting in high output voltage ripple. Under heavy I/O loads, this voltage instability causes random PLC CPU major faults and communication dropouts. New Surplus guarantees fresh internal capacitors, zero operational hours, and full factory output capacity.
Are these 1769-PB4 power supplies genuine Allen-Bradley products?
Yes. We strictly guarantee that every 1769-PB4 module supplied is 100% Original OEM New Surplus. Sourced from audited distributor overstock, OEM panel builder reserves, and verified project inventories, each unit undergoes visual, mechanical, and full-load power output bench testing prior to shipment.
Can the 1769-PB4 be powered using an AC line source?
No. The 1769-PB4 is strictly a 24V DC input module (19.2 to 31.2V DC). If your cabinet utilizes 120/240V AC line power, you must select an AC power supply module such as the 1769-PA2 or 1769-PA4.
What warranty coverage is included with this New Surplus power supply?
All New Surplus 1769-PB4 power supplies are backed by our full 1-year replacement warranty. If any functional hardware failure or power output fault occurs within 12 months under standard operating conditions, we will replace the module immediately directly from our stock.
