Yokogawa NFPW444 Power Supply Module

The Yokogawa NFPW444, also identified by the base model NFPW444, is a 24 VDC input power supply module that converts incoming DC power into regulated outputs for compatible Yokogawa control system hardware. It provides a +5.1 VDC output rated for up to 7.8 A and includes overcurrent protection and power-failure response functions. The available configuration descriptions include standard, explosion-protected, basic, and ISA Standard G3 option variants; their exact ordering codes require verification.

Hardware Specifications

DC Power Conversion and Protection Characteristics

The NFPW444 accepts a nominal 24 VDC supply within the specified 21.6 to 31.2 VDC input range. Its principal output is +5.1 VDC, with a listed output current range of 0 to 7.8 A.

The supplied specifications also list a 24 VDC +/- 10% output, a maximum current of 4 A, and a maximum current rating of 6.3 A for associated parameters. The precise relationship between these values and the individual output terminals should be confirmed against the manufacturer's wiring diagram.

The module includes overcurrent shutdown behavior and insulation withstand ratings. The listed 500 VAC withstand test applies for 1 minute, while the insulation resistance specification is 50 MOhm at 500 VDC.

Frequently Asked Questions

Q: What input voltage does the NFPW444 require?

A: The specified nominal input is 24 VDC, with an allowable range of 21.6 to 31.2 VDC.

Q: What are the main output ratings?

A: The principal output is +5.1 VDC, with a listed current range of 0 to 7.8 A. The supplied data also specifies 40 W output power and a 60 W peak rating.

Q: Can the NFPW444 be installed on a base module?

A: The supplied specifications indicate that the specified configuration is possible when installed on an NFBU200 base module. Confirm the applicable hardware revision and installation requirements before assembly.

Field Installation Guidelines

• Verify the module nameplate and input polarity before connecting the 24 VDC supply.
• Confirm that the source voltage remains within the specified 21.6 to 31.2 VDC range under operating load.
• Check the applicable Yokogawa wiring diagram to identify the main output and auxiliary output terminals before connecting loads.
• Confirm the NFBU200 base module compatibility and mechanical seating requirements for the intended configuration.
• Keep power wiring separate from low-level analog signal and communication wiring to reduce electrical interference.
• Follow the system grounding and protective bonding requirements specified in the manufacturer's installation documentation.
• Do not exceed the specified output current or peak power ratings. Verify load demand and startup current before energizing the system.
• Confirm the applicable explosion-protection rating and installation requirements from the exact product suffix and nameplate. Do not assume that every NFPW444 variant has the same certification.
• Disconnect the input supply before removing or installing the module unless the manufacturer's documentation explicitly permits energized replacement.