Product Core Brief
- Model: PW501
- Brand: Yokogawa
- Series: Yokogawa Control System Power Supply
- Core Function: 100-120V AC power supply unit for Yokogawa control system racks.
- Product Type: AC Power Supply Module
- Key Specs: 100-120V AC input | 1A fuse | recommended replacement interval 8 years
- Condition: New Original / New Surplus
Key Technical Specifications
- Manufacturer: Yokogawa
- Part Number:
- Module Type: AC Power Supply Unit
- Input Voltage: 100-120V AC
- Fuse: 1A fuse, part number A1361EF
- Recommended Replacement Interval: 8 years
- Max Ambient Temperature: Up to 40°C, depending on system configuration
- System Compatibility: Yokogawa CENTUM / ProSafe series control racks
- Mounting: Rack-mounted power supply unit
- Typical Applications: DCS racks, SIS racks, controller power feeds, legacy Yokogawa system maintenance
Product Introduction
The PW501 is a Yokogawa 100-120V AC power supply unit used in Yokogawa control system racks. It converts incoming AC power into regulated internal DC power for controller and I/O modules, making it a critical component in both CENTUM and ProSafe series installations that use 100-120V AC distribution.
Its main advantage is direct-fit replacement in existing 100-120V AC cabinets without reworking power wiring or rack configuration. For maintenance and procurement teams, this is a straightforward OEM spare that supports existing system documentation, loop checks, and plant acceptance procedures.
QA & Testing SOP
Power supply units are treated as critical spare parts because a failed unit can affect an entire rack.
- Label and authenticity check: Verify part number PW501, serial number, manufacturing markings, and fuse specification against OEM references.
- Visual inspection: Check AC terminal block, backplane connector, housing, fuse holder, capacitors, and PCB for heat damage, corrosion, or rework.
- AC input test: Apply 100-120V AC on a compatible test rack and verify normal power-up with no abnormal noise or heating.
- Output verification: Measure internal DC bus outputs with a Fluke-class multimeter and confirm they remain within specification under load.
- Fuse check: Confirm the correct 1A fuse, part number A1361EF, is installed and in good condition.
- ESD-safe packing: Ship in anti-static packaging with terminal and backplane protection, plus label photos for receiving QA.
Installation Pitfalls & Guide
❗ Confirm input voltage before installation. The PW501 is rated for 100-120V AC input. Installing it on a 220-240V AC supply will damage the unit. For 220-240V AC systems, the PW502 is typically used.
❗ Do not hot-swap without procedure. Removing or inserting a power supply can disturb the control rack bus and cause an unintended trip. Follow plant MOC and system procedures.
❗ Check the recommended replacement interval. Yokogawa lists an 8-year recommended replacement interval for the PW501. Older units may show capacitor aging even if they still power up.
❗ Verify the correct fuse. The PW501 uses a 1A fuse, part number A1361EF. Using the wrong fuse can compromise protection or cause nuisance trips.
Replacement steps:
- Pre-install: Confirm input voltage, rack position, fuse type, and ESD precautions.
- Removal: Follow system procedures, isolate AC power if required, label wiring, and remove the module.
- Install: Seat the module firmly, reconnect AC wiring, and verify terminal torque and grounding.
- Power-on test: Restore AC power, check status indicators, measure DC bus outputs, and confirm rack diagnostics are normal.
Technical FAQ
Is pricing flexible? Yes. Price depends on condition, stock availability, label completeness, test records, and whether the unit is new original or new surplus. Urgent shutdown replacements can be prioritized.
What warranty is included? Surplus power supply modules usually carry a limited functional warranty, often 30-90 days, unless otherwise agreed. Final terms depend on stock source and customer QA requirements.
Can this replace a PW502? No. The PW501 is rated for 100-120V AC input, while the PW502 is for 220-240V AC input. Substituting the wrong voltage rating can damage the module and the rack.
What fuse does the PW501 use? It uses a 1A fuse, part number A1361EF. Always verify the correct fuse before commissioning.
Do you provide test records? We can provide label photos, bench power-up notes, DC output measurements, and packing records. Full load testing or formal test certificates can be arranged if required.
