Yokogawa PW482-11

DC Input Electrical Parameters

Dual-Channel DC Output Parameters

Physical & Mechanical Parameters

Environmental Operating Parameters

Safety & EMC Certification

Function & Feature Highlights

1. Miniaturized compact structural design, occupying narrow card slot space inside the DCS rack, saving cabinet internal installation space, matching small compact control cabinets with limited internal layout space.
2. Hot-swappable modular structure, module disassembly and replacement can be completed under the continuous running state of the DCS system, no need to cut off the whole cabinet power supply, effectively shortening the maintenance downtime of small process equipment.
3. Built-in independent hardware protection circuit for input terminal and each output channel, covering input reverse polarity protection, input overvoltage/undervoltage protection, output overvoltage/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 CPU and communication modules.
4. DC input ripple suppression filter circuit integrated at the input port, composed of differential-mode inductors and low ESR filter capacitors, effectively filtering high-frequency ripple noise from industrial backup battery power supply, eliminating signal sampling distortion and bus communication packet loss caused by power ripple interference.
5. Front panel LED status indicator group, including green power normal indicator light, red fault alarm indicator light, yellow overload warning indicator light. Each indicator corresponds to independent operating status, maintenance staff can directly judge the module running 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 power derating control logic. When the internal temperature exceeds 60℃, the module automatically reduces the maximum total output power by 15% to lower internal power loss and heat generation; when the internal temperature reaches 65℃, over-temperature protection is triggered to cut off all DC output power, preventing thermal breakdown of internal power semiconductor components.

Material & Structural Composition

1. Outer shell material: Glass fiber reinforced flame-retardant ABS plastic, UL94 V-0 fire resistance grade, anti-aging and weak corrosion resistance, adapting to general factory control room environment.
2. Main circuit substrate: Four-layer high Tg FR4 flame-retardant copper-clad board, thickened copper foil for power transmission loops to reduce conduction heat and voltage drop.
3. Isolation conversion components: Medium-capacity high-withstand-voltage high-frequency isolation transformer, multi-layer mica insulating paper separating primary and secondary windings to meet 2000VDC isolation safety standards; imported fast recovery rectifier diodes and low ESR filter electrolytic capacitors.
4. Heat dissipation components: Medium-area aluminum alloy extrusion heat sink installed on the back of the module, connected to switching power tubes and rectifier components via thermal conductive silicone pads; strip heat dissipation ribs distributed on left and right side panels for natural convection heat dissipation, no auxiliary cooling fan required.
5. Backplane contact components: Spring contact connector with 0.3μm thick gold plating on contact surface, preventing long-term plug-in oxidation and stabilizing high-current transmission contact resistance.
6. Internal insulation components: Mica insulation sheets separating high-voltage input circuit and low-voltage output circuit; flame-retardant plastic isolation baffles between two output channels to avoid cross-channel short-circuit risks caused by component failure.

Working Principle

1. 48VDC input filtering and reverse protection stage: External industrial 48V backup battery power enters the built-in ripple filter circuit to filter DC high-frequency ripple noise. The filtered voltage passes through the hardware anti-reverse circuit; if positive and negative poles are reversely connected, the circuit automatically disconnects the power loop to protect internal components. The processed 48VDC voltage is smoothed by primary side filter capacitors and transmitted to the switching conversion circuit.
2. High-frequency switching energy conversion stage: Smoothed 48VDC drives medium-power high-frequency MOSFET switching tubes to perform PWM pulse width modulation switching actions controlled by dedicated power management chip. The high-frequency pulse energy generated by switching is coupled to each secondary winding of the isolation transformer through electromagnetic induction.
3. Dual-channel voltage stabilization output stage: Each secondary winding corresponds to an independent rectification, filtering and voltage stabilization circuit. The alternating pulse voltage induced by windings is converted into smooth stable DC voltage through fast recovery rectifier diodes and low ESR filter capacitor groups. The built-in voltage sampling feedback circuit collects real-time output voltage and feeds data back to the primary side PWM control chip, adjusting switching pulse duty cycle in real time to maintain constant DC output voltage under variable rack load conditions.
4. Real-time fault monitoring and protection execution stage: Multi-channel sampling circuits continuously monitor input voltage, each channel output voltage, output current and module internal temperature. When any abnormal threshold is triggered, the hardware protection circuit instantly locks the driving signal of switching tubes to cut off energy transmission of the isolation transformer. At the same time, the corresponding fault LED on the front panel lights up, and fault state signals are uploaded to the rack backplane bus, transmitted to the upper monitoring screen to trigger system sound and light alarms for rapid troubleshooting.

Application Scenarios

• Small-scale sewage treatment station compact CENTUM VP DCS control cabinet power supply
• Chemical laboratory pilot small batch reaction production line distributed control rack power supply
• Small heating boiler auxiliary circulating water pump, flue gas fan DCS control cabinet dedicated power supply
• Small-sized urban water supply pumping station process control system compact rack power supply equipment