Description
Hard-Numbers: Technical Specifications
- Input Voltage Range: 220-240 V AC ±10%, 50/60 Hz ±3 Hz (suffix -50)
- Input Voltage Range (alt): 100-120 V AC ±10%, 50/60 Hz ±3 Hz (suffix -10)
- Output Voltage 1: 24 V DC @ 1.7A
- Output Voltage 2: 5.1 V DC @ 7.8A
- Output Power Rating: 50W (module-level)
- Efficiency Rating: >90% typical, up to 96%
- Operating Temperature Range: -20°C to +60°C (standard), up to +70°C with cooling fan
- Protection Class: IP20
- Mounting Type: Rack mount in Safety Control Unit (S2SC70 series)
- Weight: 0.9-1.0 kg
- Dimensions: 51 mm (W) × 203 mm (H) × 152 mm (D) (compact module footprint)
- Redundancy Support: Dual-module redundant configuration available
YOKOGAWA PW482-50
The Real-World Problem It Solves
Your safety control station loses power and trips the entire ESD system because a single supply module failed and you had no redundant backup. The PW482-50 eliminates this nightmare by providing dual-output power (24V for field I/O, 5.1V for logic) in a module that supports full redundancy—when one module fails, the standby takes over without interrupting safety logic execution.
Where you’ll typically find it:
- ProSafe-RS Safety Control Stations (SCS) in SIL 2/3 safety instrumented systems
- CENTUM VP Node Units requiring stable dual-voltage power distribution
- Emergency Shutdown (ESD) systems in upstream oil & gas platforms
- Refinery burner management systems (BMS) with tight coupling between DCS and safety layers
You get dual-output power architecture with overvoltage/overcurrent protection in a hot-swappable module designed for safety-critical zero-downtime maintenance.
Hardware Architecture & Under-the-Hood Logic
The PW482-50 is a switching power supply designed for rack-mounted installation in ProSafe-RS Safety Control Units and CENTUM VP node units. It features full galvanic isolation between input and both output rails to prevent ground loop coupling—a critical requirement for safety systems. The module integrates overvoltage, overcurrent, and short-circuit protection on both output stages, and includes diagnostic circuitry that reports fault status to the Safety Control Unit processor via backplane.
- AC input passes through EMI filtering and rectification stage
- Switching converter (flyback topology) generates two regulated DC rails (24V and 5.1V)
- Output stage 1 provides 24V DC @ 1.7A for field I/O devices
- Output stage 2 provides 5.1V DC @ 7.8A for logic circuits and processors
- Fault detection circuitry monitors both output rails and reports to SCU/Node Unit processor
Field Service Pitfalls: What Rookies Get Wrong
Mixing Voltage Suffix CodesInstalling a 100-120 VAC module into a cabinet wired for 220-240 VAC fries the input stage instantly. The suffix codes matter—PW482-50 is specifically 220-240 VAC, and forcing a different voltage range into it destroys the front-end filtering and rectifier.
- Field Rule: Verify the suffix code matches your plant’s mains voltage before you even pull the module from the box.
Overloading 5.1V Logic RailThe 5.1V output is rated for 7.8A and is designed for logic circuits only—do not attempt to power additional I/O field devices from this rail. Overloading the logic rail causes erratic processor behavior and can crash your safety system.
- Quick Fix: Verify total logic-side load current before installation—stay within 70% of the 7.8A rating to allow for inrush currents and thermal margin.
Ignoring Redundant Module SynchronizationIn dual-module redundant configuration, both PW482-50 modules must be properly synchronized via backplane. If you replace one module without verifying the other’s health, you may end up with both modules fighting each other or both in standby mode.
- Field Rule: Always check the status of the redundant module before pulling one for replacement—use CENTUM VP engineering tools to verify active/standby states.
YOKOGAWA PW482-50
Commercial Availability & Pricing Note
Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.
