The Yokogawa F3PU20-0S, also cataloged as the F3PU20 Power Supply Module, operates as a dedicated hardware component for AC-to-DC power conversion and system bus voltage regulation within Yokogawa FA-M3 PLC platforms. The unit conditions incoming universal AC utility power into a regulated 5 VDC rail across the FA-M3 backplane to drive CPU processors, communication interfaces, and digital I/O modules.
| Parameter | Specification |
|---|---|
| Model | F3PU20-0S |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.3 kg (0.66 lbs) |
| Dimensions | 28.9 x 100 x 83.2 mm (3.3 x 4.0 x 2.3 in) |
| Operating Temp | 0 to 55 deg C |
| Storage Temp | -20 to 70 deg C |
| Operating Humidity | 5 to 95% RH (non-condensing) |
| Power Consumption | Input line draw dependent on load |
| Input Voltage Range | 100-240 VAC (50/60 Hz) |
| Output Voltage | 5 VDC regulated |
| Output Current Capacity | Up to 20 A |
| Power Conversion Efficiency | >= 80% |
| Integrated Protection | Overcurrent, overvoltage, thermal shutdown |
| Status Diagnostics | LED indicators for power availability and fault conditions |
| Mounting Type | Dedicated power supply slot in FA-M3 PLC backplane chassis |
| Certifications | CE, UL, CSA |
The F3PU20-0S incorporates high-frequency switching technology and internal EMI filters to deliver low-ripple 5 VDC power directly to the FA-M3 backplane bus. By maintaining strict electrical isolation between the primary 100-240 VAC input terminals and the secondary system logic bus, the module prevents line surges, noise transients, and ground potential fluctuations from propagating into sensitive analog processing cards. This stable power baseline preserves the signal integrity of downstream 4-20 mA HART loop protocol modules and high-resolution input cards, ensuring accurate analog-to-digital conversions without channel-to-channel crosstalk or offset drift.
Q: What actions occur when the F3PU20-0S encounters an output overload or short-circuit condition?
A: The module triggers its integrated overcurrent protection circuit, dynamically limiting output current or latching off the 5 VDC rail to protect the backplane traces and installed PLC modules. The internal fault diagnostics deactivate the front-panel POWER LED to alert operators of the trip condition.
Q: Can maintenance personnel replace the F3PU20-0S power supply module while the FA-M3 chassis remains energized?
A: No, field engineers must completely isolate and disconnect the incoming 100-240 VAC mains supply before removing or inserting the power supply module. Swapping the primary power supply under load risks backplane arcing, potential hardware damage, and ungraceful CPU shutdown.
Mount the F3PU20-0S into the dedicated leftmost power supply slot of the FA-M3 chassis, pressing the module firmly until the backplane connectors fully seat and the retaining latch locks into place. Connect input AC mains power conductors (100-240 VAC) to the terminal strip using insulated crimp lugs, taking care to land the protective earth (PE) conductor directly on the low-impedance ground terminal. Maintain minimum physical clearance around the power supply heat sink louvers to support natural convection cooling within the panel enclosure. Always double-check that line voltage levels fall within specified operating thresholds prior to initial energization.
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