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Allen-Bradley 1768-PB3 CompactLogix Power Supply Module
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- Part Number: 1768-PB3
- Brand: Allen-Bradley
- Type: Power Supply Modules
- Barcode: USA
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Product Description
The Allen-Bradley 1768-PB3, also cataloged as the 1768-PB3 DC Power Supply Module, operates as a dedicated hardware component for direct DC voltage conversion and regulated backplane power distribution within CompactLogix 1768 platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1768-PB3 |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 1.02 kg (2.25 lbs) |
| Dimensions | 131.3 x 132.8 x 105.4 mm (5.17 x 5.23 x 4.15 in) |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | Max input power 112 W at 24 VDC |
| Input Voltage Range | 16.8 to 31.2 VDC (Nominal 24 VDC) |
| Output Voltage | Backplane and Front Panel AUX (18 to 27.6 VDC) |
| Minimum Ride-through | 5 ms at 90 W |
| Extended Hold-up | 8 to 12 ms at 1.25 W |
| Power Dissipation | 22 W at 24 VDC (Max thermal dissipation 22 W) |
| Isolation Voltage | 250 V continuous (Reinforced Insulation Type) |
| Inrush Current | Nominal 30 A / Max 50 A at 16.8-31.2 VDC |
| Enclosure | Open-type |
Proportional Control and Backplane Bus Power Integration
- I/O Density Scaling: Delivers stable system DC voltage across the CompactLogix rail to power adjacent 1768 CPU modules, communication interfaces, and up to 30 expansion I/O units across attached 1769 chassis banks.
- Backplane Bus Communication Velocity: Filters ripple and transients on incoming 24 VDC supply lines to maintain power rail stability, ensuring uninterrupted data packet routing and deterministic communication across the internal backplane bus.
- Firmware Flash Compatibility: Operates as a purely passive hardware power stage, supplying continuous voltage during high-current operations such as controller firmware flashing and system parameter updates.
Frequently Asked Questions
Q: What input supply voltage range is accepted by the 1768-PB3 module?
A: The module operates on a direct current input range of 16.8 to 31.2 VDC with a nominal operating rating of 24 VDC.
Q: How long is the power ride-through interval during input supply voltage dips?
A: The module provides a minimum ride-through hold-up interval of 5 ms at a full 90 W load, extending up to 8 to 12 ms under a reduced 1.25 W load.
Q: What type of internal overcurrent protection is integrated into the 1768-PB3?
A: Overcurrent protection is implemented via an embedded, non-replaceable fuse soldered directly across the internal circuit board input terminals.
Field Installation Guidelines
- Terminal Wiring Gauges: Wire incoming power supply terminals using 14 AWG (2.5 mm sq) copper conductors rated for 75 deg C or higher with a maximum insulation thickness of 1.2 mm.
- Auxiliary Output Wiring: Connect front panel auxiliary output terminals using 14 AWG to 22 AWG (2.5 mm sq to 0.25 mm sq) solid or stranded copper wire.
- Isolation and Grounding: Maintain separation between 24 VDC power conductors and signal wiring. Connect the module ground terminal directly to the enclosure main earth grounding bus using low-impedance conductors to preserve the 250 V continuous isolation rating.
- Ventilation Clearances: Mount the open-type unit with adequate vertical clearance to ensure natural convection airflow dissipates up to 22 W of thermal loss under full load.
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