Description
Yokogawa PW481-50 DCS Power Supply Module
Technical Specifications Model: PW481-50 Input: 100~240VAC, 50/60Hz Output: Multi-channel regulated DC output for DCS backplane bus Mounting Form: Plug-in DCS rack module Operating Temperature: 0℃ ~ +60℃ Storage Temperature: -20℃ ~ +70℃ Relative Humidity: 10% ~ 90% non-condensing Protection Function: Overvoltage, overcurrent, overtemperature protection Module Indicator: Power OK LED, Fault LED
Functional Features Wide range AC input adapts to industrial power grid fluctuation. High power capacity supports full load power supply for large DCS rack with multiple I/O modules. Supports redundant parallel operation with another PW481-50 module. Built-in multi-layer protection circuit cuts off output when electrical fault occurs. Power OK and fault LED indicators display module running state. Low ripple DC output ensures stable operation of high-precision DCS measurement and control modules. Internal self-diagnosis monitors power conversion hardware continuously. Hot swap function supports module replacement without shutting down entire DCS rack.
Application Scenarios Large petrochemical plant CENTUM DCS control rack, power plant thermal control system, fertilizer factory process control station, refinery process monitoring system, large chemical plant continuous production control platform.
Performance Parameters High power conversion efficiency reduces heat generation under full load. Output voltage maintains stable value within tolerance range with AC input variation. Protection circuit responds rapidly to electrical fault. Redundant parallel power supply achieves bumpless switchover upon single module failure. Output voltage ripple remains low at full rated load. Self-diagnosis function reliably captures internal hardware degradation and fault.
Material Composition Module housing: Black flame-retardant engineering plastic. Main PCB: FR4 multi-layer industrial printed circuit board with conformal coating. Core electronic components: AC-DC switching power chip, high frequency transformer, rectifier circuit, filter capacitor, voltage and current monitoring IC. Connector: Gold-plated edge connector for DCS rack backplane. Indicator: Light emitting diodes for power and fault status. Fasteners: Plastic positioning buckle.
Structural Features Large size rectangular plug-in module for Yokogawa DCS rack. Front panel equipped with power OK LED and fault LED indicators. Gold-plated edge connector on rear for backplane bus connection. Internal high voltage AC circuit and low voltage DC circuit separated by isolation barrier. Ventilation openings on housing for natural convection heat dissipation. Side positioning buckle for accurate alignment and locking on rack slot.
Working Principle AC power enters module through rack backplane. EMI filter circuit suppresses power grid noise. High frequency switching circuit converts AC power to isolated multi-channel DC voltage. Rectifier and filter circuit smooth DC ripple. Feedback circuit continuously samples output voltage and adjusts switching duty cycle to stabilize output. Overvoltage, overcurrent and overtemperature monitoring circuit runs in real time. When exceeding threshold, protection circuit shuts down power conversion stage and activates fault LED. Redundant dual PW481-50 modules run in parallel, each module can bear full rack load independently. When one module fails, the other continues supplying power without interrupting DCS operation.
Installation Requirements Cut off rack power before installing or removing PW481-50 module. Align module with empty slot of Yokogawa DCS rack, push inward until backplane connector fully inserts and buckle locks. Connect AC power wiring to rack power terminal according to specification. Power on rack and check LED indicators. For redundant configuration, install two PW481-50 modules in designated rack slots. Reserve ventilation space around modules to prevent heat accumulation. Test redundant switchover function during system commissioning.
Usage Precautions Only compatible with matched Yokogawa CENTUM DCS rack. Cut off rack AC power before plugging or unplugging module. Do not exceed maximum rated output power of module. Redundant configuration is mandatory for critical process control racks. Clean dust on ventilation openings regularly. Do not open module housing without professional authorization, internal high voltage components exist. Replace module when continuous fault alarm occurs.
