Yokogawa PW481 AC Power Supply Module

Overview

Configured for AC power conversion and distribution in Yokogawa control hardware, the Yokogawa PW481 (PW481 AC Power Supply Module) provides direct electrical power input for compatible Field Control Units, FIO Node Units, and Optical ESB Bus Repeater Units. The module accepts 100-120 V AC input power and supports dual-redundant installation where the applicable system configuration permits two power supply modules.

Hardware Specifications

Process Control Power Integration

The PW481 operates as part of the electrical power infrastructure for Yokogawa process control hardware. Unlike field I/O modules that process 4-20 mA HART signals or other instrumentation data, this module supplies AC-derived operating power to the associated control unit architecture. Therefore, signal loop wiring and power wiring should remain physically separated according to the applicable system installation requirements.

The exclusive connector provides the electrical interface between the PW481 and the compatible Yokogawa hardware. In addition, a dual-module arrangement can support redundant power supply architecture when the target FCU, FIO Node Unit, or Optical ESB Bus Repeater Unit supports that configuration.

Frequently Asked Questions (FAQ)

Q: What input voltage does the Yokogawa PW481 require?
A: The PW481 accepts 100-120 V AC with a tolerance of +/- 10%.

Q: Can two Yokogawa PW481 modules operate in a redundant configuration?
A: Yes. The provided technical data specifies support for a dual-redundant configuration when two compatible modules are installed in the applicable system hardware.

Q: What is the maximum power consumption of the PW481?
A: The specified maximum power consumption is 200 VA. The upstream power circuit should be evaluated according to the complete system load and applicable installation requirements.

Field Installation Guidelines

• Verify that the incoming supply voltage and frequency match the PW481 specifications before installation.
• Isolate the external power source before inserting or removing the module unless the applicable Yokogawa system documentation explicitly permits energized replacement.
• Install the module only in the designated compatible FCU, FIO Node Unit, or Optical ESB Bus Repeater Unit position.
• Confirm full engagement of the exclusive connector before energizing the system.
• Keep AC power wiring separated from low-level instrumentation and communication cables where practical.
• Apply the grounding and shielding arrangement specified for the complete Yokogawa control cabinet.
• When using a dual-redundant configuration, verify that both PW481 modules are correctly seated and supported by the target hardware configuration.
• Inspect the complete system power arrangement after installation and before returning the control equipment to service.

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