YOKOGAWA PW504 Power Supply Unit

Configured for internal bus voltage regulation in YOKOGAWA CENTUM VP and CENTUM CS 3000 control systems, the YOKOGAWA PW504 (PW504 Power Supply Unit) provides direct physical/electrical execution. The module converts AC line voltage into a regulated 5 VDC rail output to drive rack-mounted controllers, I/O cards, and communication processors across backplane buses. By delivering continuous power conditioning and surge suppression, the hardware maintains backplane logic stability under varying electrical loads.

Suffix Breakdown & Model Matrix

Hardware Specifications

Process Control Integration & Channel Isolation

Engineered for high-density DCS deployment, the PW504 incorporates galvanic isolation between primary AC line inputs and low-voltage secondary DC outputs to safeguard system processors from line transients. The unit maintains stable 5 VDC supply rails that support downstream fieldbus communications, including 4-20 mA HART loop protocol translation, FOUNDATION Fieldbus signal routing, and Profibus PA interface cards. Integrated filter networks minimize high-frequency ripple, preventing power-line noise coupling into analog input measurement channels and cold junction compensation (CJC) circuits.

Frequently Asked Questions

Q: How does the PW504 handle AC input voltage selection between 100-120 VAC and 200-240 VAC ranges?

A: Voltage range selection relies on proper terminal wiring terminal configurations or internal jumper settings on the module side prior to energizing the unit.

Q: Can two PW504 modules operate in a dual-redundant power configuration within the same subrack?

A: Yes, when installed in designated dual-power slots on compatible subrack backplanes, two PW504 modules share the load and execute active hot-standby power failover.

Field Installation Guidelines

Mount the PW504 securely into the designated power supply slot on the subrack assembly, tightening the top and bottom retaining screws to establish frame grounding. Always isolate AC main power feeds before installing or replacing the power module to eliminate physical shock hazards and connector arcing.

Route incoming AC power conductors through dedicated wire raceways separated from sensitive DC signal lines and coaxial communication cables. Ensure the protective earth (PE) grounding conductor connects directly to the cabinet ground bar using a low-impedance connection to guarantee noise suppression and electrical safety.