NFPW444-50 Yokogawa 24V DC Input 5.1V DC Output

Product Overview

The Yokogawa NFPW444 serves as a specialized DC-to-DC power conversion unit designed for the STARDOM FCN/FCJ and CENTUM VP automation platforms. It converts a wide 24V DC field input into high-stability regulated voltage rails (+5.1V DC and +12V DC) to power internal CPU logic and communication interfaces. We provide this module as 100% Brand New and Original, ensuring your distributed control system (DCS) maintains continuous availability in mission-critical environments like oil refineries, offshore platforms, and chemical plants.

Part Number Breakdown: NFPW444

Yokogawa utilizes specific coding for environmental and revision variants:

Technical Specifications

The NFPW444 features high power density and advanced thermal management:

• Rated Input Voltage: 24 V DC

• Input Voltage Range: 21.6 to 31.2 V DC (±10% Tolerance)

• Rated Output Voltage: +5.1 V DC (Logic Side)

• Rated Output Current: 0 to 7.8 A

• Total Power Output: 60 W (Sufficient for fully populated NFBU racks)

• Redundancy: Supports dual-power configuration for zero-fail operations.

• Cooling: Passive natural convection (fanless design).

• Weight: 0.6 kg (1.32 lbs).

• Dimensions (W×H×D): 4.97 cm x 13 cm x 14.65 cm.

Engineering Advantages

The NFPW444 resolves critical reliability issues in field-deployed control systems:

• Hot-Swappable Maintenance: The module’s design allows live replacement. When configured in a redundant pair within an NFBU series rack, you can pull a faulty unit and insert a new NFPW444 without de-energizing the controller or interrupting live process data.

• Direct 24V DC Field Integration: Designed for facilities operating on centralized DC battery banks, the NFPW444 eliminates the need for external AC-to-DC inverters. It directly accepts 24V DC, reducing energy conversion losses and decreasing heat buildup inside the control cabinet.

• RAS-Ready Diagnostics: The module features integrated RAS (Reliability, Availability, and Serviceability) circuits. Front-panel status LEDs and internal health monitoring circuits detect input fluctuations or output sagging, triggering system-level alarms before a hardware failure occurs.

• Resistant to Electrical Noise: Optimized for harsh electromagnetic environments, the NFPW444 filters input transients and common-mode noise. This ensures the CPU logic receives a "clean" 5.1V rail, preventing memory corruption or CPU hangs in high-noise industrial zones.

FAQs

Q: Can I use the NFPW444 in a rack that currently uses an AC power supply?

A: No. While the physical footprint matches, you must ensure the rack backplane and the auxiliary power source align. Mixing AC (NFPW442) and DC (NFPW444) inputs in the same redundant pair is not supported.

Q: Does the NFPW444 require a cooling fan?

A: No. The NFPW444 uses passive natural convection. You must ensure the cabinet has adequate ventilation and respect the 0 °C to +55 °C operating temperature range to maintain maximum MTBF (Mean Time Between Failures).

Q: How do I know if the module is functioning correctly after installation?

A: Check the front panel "READY" LED. A steady green light confirms that the input voltage is within the 21.6–31.2 V DC range and that the internal +5.1V output is correctly regulated and active on the backplane bus.

Q: Is the NFPW444-50 compatible with older Style S1 racks?

A: Generally, Style S2 modules are backward compatible with S1 racks. However, we recommend verifying your specific NFBU rack revision to ensure that all diagnostic and redundancy reporting functions operate as intended.