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Description
The Allen-Bradley 1746-P1 is a dedicated power supply module designed for use within the SLC 500 programmable logic controller system. This rack-mounted unit provides the necessary DC power to the backplane, supporting the CPU and various I/O modules installed in the chassis. It is engineered to operate across a wide range of AC line voltages, ensuring compatibility with diverse industrial power environments.
Features
- Wide input voltage range: 85-132 VAC or 170-265 VAC (auto-switching/selectable).
- Robust power output: Provides 2A at 5 VDC and 0.46A at 24 VDC to the backplane.
- Integrated 24 VDC user power output for field devices.
- High-reliability design with 1800V AC RMS isolation for 1 second.
- CPU hold-up time of 20 ms at full load to ensure stable operation during brief power interruptions.
- Rack-mount form factor for seamless integration into standard SLC 500 chassis.
Technical Specifications
| Parameter |
Specification |
| Input Voltage |
85-132 / 170-265 VAC |
| Frequency |
47-63 Hz |
| Internal Current Capacity |
2A at 5 VDC, 0.46A at 24 VDC |
| User Power Output |
200 mA at 24 VDC |
| Max Inrush Current |
20A |
| Power Requirement |
135 VA |
| Operating Temperature |
0 degC to 60 degC |
| Fuse Protection |
1746-F1 or equivalent |
Installation Guidelines
- Ensure the power supply is installed in the leftmost slot of the SLC 500 chassis.
- Always disconnect main power before inserting or removing the module from the rack to prevent electrical arcing or damage to the backplane connectors.
- Verify that the AC input voltage selector switch (if applicable) matches your local power source before applying power.
- Maintain adequate clearance around the module to allow for proper airflow and cooling, as the unit dissipates heat during operation.
- Use shielded cables for I/O connections to minimize EMI interference, and ensure the chassis is properly grounded to a common earth point.
FAQ
What is the primary function of the 1746-P1?
The 1746-P1 acts as the main power source for the SLC 500 rack, converting incoming AC line voltage into the regulated DC voltages required by the processor and I/O modules.
Can this module provide power to external sensors?
Yes, the module provides a 24 VDC user power output with a capacity of 200 mA, which can be used to power compatible field devices or sensors.
What should I do if the power supply fails?
First, check the input voltage and the status of the external fuse. If the module remains unresponsive, it may require replacement. Always ensure the replacement unit is a genuine Allen-Bradley 1746-P1 to maintain system integrity.
