Description
Hard-Numbers: Technical Specifications
- Input Voltage Range: 220-240 V AC, 50/60 Hz (suffix -53)
- Input Voltage Range (alt): 100-120 V AC, 50/60 Hz (suffix variants available)
- Input Voltage Range (DC variant): 24 V DC (suffix variants available)
- Output Voltage: +24 V DC
- Output Current: 5 A
- Output Power Rating: 120W / 530VA (system-level)
- Efficiency Rating: >85% typical
- Operating Temperature Range: -20°C to +60°C
- Protection Class: IP20
- Mounting Type: Rack mount in Safety Control Unit (SC2SC70 series)
- Weight: 0.3–0.5 kg
- Dimensions: 88 mm (W) × 50 mm (H) × 63 mm (D) (compact module footprint)
Yokogawa SPW482-53
The Real-World Problem It Solves
Your safety instrumented system loses power, the ESD valves don’t fire, and the plant goes into full emergency shutdown because a single power supply failed. The SPW482-53 eliminates this nightmare by providing dual-redundant power in the Safety Control Station—when one module fails, the other carries the full load without a hiccup.
Where you’ll typically find it:
- ProSafe-RS Safety Instrumented Systems (SIS) with Safety Control Stations (SCS)
- Emergency Shutdown (ESD) systems in upstream oil & gas platforms
- Safety Critical Control systems in refineries and petrochemical plants requiring SIL 2/3 compliance
You get redundant power architecture in a compact module that swaps hot without taking the safety system offline.
Hardware Architecture & Under-the-Hood Logic
The SPW482-53 is a compact AC/DC switching power supply designed for rack-mounted installation in ProSafe-RS Safety Control Units. It features full galvanic isolation between input and output to prevent ground loop coupling—a critical requirement for safety systems. The module integrates overvoltage, overcurrent, and short-circuit protection on the output stage, and includes diagnostic circuitry that reports fault status to the Safety Control Unit processor via the backplane.
- AC input passes through EMI filtering and rectification stage
- Switching converter (flyback topology) generates regulated DC
- Output stage provides +24 V DC at 5A with current limiting
- Fault detection circuitry monitors output voltage/current and module health
- Status signals flow to SCU processor for redundant operation monitoring
Yokogawa SPW482-53
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—SPW482-53 is specifically 220-240 VAC, and forcing a different voltage range into it destroys the front-end filtering.
- Field Rule: Verify the suffix code matches your plant’s mains voltage before you even pull the module from the box.
Ignoring Redundant Power WiringThinking you can hot-swap a power module without checking the dual-power wiring is dangerous. The second module must carry the entire load; if the wiring is undersized or loose, you’ll drop the safety system during swap.
- Quick Fix: Measure the load current on both modules before pulling one—if one is carrying near-zero current, the redundancy isn’t active.
Bypassing Alarm WiringThe module has a fault alarm contact that should tie into the system’s SIL-rated alarm chain. Bypassing or ignoring this contact defeats the purpose of a redundant safety power system.
- Field Rule: Never wire the alarm contact to a non-safety input—route it to the SCU’s diagnostic input so the system knows when a power module fails.
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.
