The Yokogawa SPW481 is an AC-DC power supply module used in Yokogawa CENTUM VP / CENTUM CS / ProSafe-RS systems.
It provides stable system power (DC bus supply) for critical automation components such as:
- Field Control Units (FCU)
- Safety Control Stations (SCS)
- ESB bus / FIO systems
- Remote I/O and controller racks
It is part of Yokogawa’s SPW/PW48x power supply family, designed for high-reliability industrial control systems with redundancy support.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Yokogawa |
| Model | SPW481 |
| Product Type | AC Power Supply Module |
| System Compatibility | CENTUM VP / ProSafe-RS / FIO systems |
| Input Voltage | 100–120 V AC ±10% |
| Frequency | 50/60 Hz |
| Output Voltage | +5 V DC and +24 V DC (system bus) |
| Power Capacity | ~200 VA (typical system rating) |
| Mounting | Rack-mounted (P1–P2 slots) |
| Redundancy | Supported (dual power configuration) |
| Operating Temperature | -20°C to +70°C (ISA G3 class) |
| Replacement Cycle | ~8 years recommended |
Physical Characteristics
| Item | Specification |
|---|---|
| Dimensions | Approx. 72 × 96 × 53 mm |
| Weight | ~0.9 kg |
| Installation | Control cabinet rack system |
| Structure | Plug-in modular power unit |
System Role
The SPW481 acts as the main power backbone module in Yokogawa control systems.
Typical architecture:
-
AC input (100–120 V)
→ SPW481 Power Module
→ DC bus distribution
→ CPU modules / I/O modules / ESB communication modules
It ensures continuous and stable power delivery for safety-critical control systems.
Recommended Related Models
- Yokogawa SPW482 – 220–240 V AC version
- Yokogawa SPW484 – 24 V DC input version
- Yokogawa S2CP / SCP series – processor modules
- Yokogawa SNT10D – ESB optical repeater system
- Yokogawa FIO / SCS racks
