Yokogawa PW502

AC Input Electrical Parameters

Dual-Channel DC Output Parameters

Physical & Mechanical Parameters

Environmental Operating Parameters

Safety & EMC Certification

Function & Feature Highlights

1. Wide-range universal AC input design, stable DC output can be maintained under 85VAC~264VAC grid voltage fluctuation, fully adapting to industrial factory power grids with large voltage drop during peak production periods.
2. Built-in AC input soft-start charging circuit, effectively suppressing large peak surge current generated at power-on moment, avoiding instantaneous grid voltage drop caused by power supply startup, eliminating interference to other precision control instruments connected to the same power grid.
3. Multi-stage EMI filter structure arranged at AC input port, composed of common-mode inductors, differential-mode capacitors and absorption resistors, fully filtering high-frequency electromagnetic noise transmitted from industrial power grids, avoiding DCS signal sampling distortion and communication bus data packet loss caused by power supply electromagnetic interference.
4. Independent hardware protection circuit for AC input terminal and each DC output channel, integrating input overvoltage/undervoltage protection, output overvoltage/undervoltage/overcurrent/short-circuit protection. When a single output channel is short-circuited, only the faulty channel stops power output, and the other channel maintains stable power supply to guarantee the normal operation of core redundant CPU and communication modules.
5. Front panel multi-functional LED status indicator group, including green power normal LED, red input fault LED, yellow output overload alarm LED. Each LED corresponds to independent fault state, maintenance staff can quickly judge module operating state and fault type through front panel lights without disassembling the module or using external measuring instruments.
6. Built-in internal temperature real-time monitoring and automatic power derating logic. When the internal temperature rises above 61℃, the module automatically reduces the maximum total output power by 18% to lower internal power loss and heat generation; when the internal temperature exceeds 66℃, over-temperature protection is triggered to cut off all DC output power, preventing thermal breakdown of internal high-power power semiconductor components.
7. Hot-swappable modular design, PW502 module can be pulled out and replaced when the DCS rack is in continuous normal operation without cutting off the entire cabinet power supply, greatly shortening maintenance downtime of medium-load continuous production process equipment.

Material & Structural Composition

1. Outer shell material: High-strength glass fiber reinforced flame-retardant ABS+PC alloy plastic, UL94 V-0 fire resistance grade, excellent anti-aging and weak-medium corrosion resistance, adapting to medium-sized petrochemical plant control room environment.
2. Main circuit substrate: Five-layer high Tg FR4 flame-retardant copper-clad board, thickened copper foil for high-current power transmission loops to reduce conduction heat generation and voltage drop under full-load high-current operation state.
3. Isolation conversion components: Medium-large capacity high-withstand-voltage high-frequency isolation switching transformer, multi-layer thick mica insulating paper separating primary and secondary windings to meet 2500VAC high-voltage isolation safety requirements; imported high-power fast recovery rectifier bridge stacks and low ESR high-capacity filter electrolytic capacitors.
4. Heat dissipation components: Large-area extruded aluminum alloy heat sink installed on the back of the module, connected to high-power switching power tubes and rectifier bridge stacks through high thermal conductivity silicone pads; dense strip heat dissipation ribs distributed on left and right side panels to maximize natural convection heat dissipation efficiency without auxiliary cooling fan, zero mechanical wearing parts.
5. Backplane contact components: Spring contact connector with 0.32μm thick gold plating on contact surface, effectively preventing long-term plug-in contact oxidation and stabilizing high-current transmission contact resistance.
6. Internal insulation components: Thick mica insulation sheets separating AC high-voltage input circuit and low-voltage DC output circuit; flame-retardant plastic isolation baffles between two DC output channels to completely avoid cross-channel short-circuit risks caused by internal component breakdown failure.