Description
Yokogawa PW502-S1 FAW05-5R0 | 5V 5A Power Supply
Product Introduction
Power-supply identification is where this part number is frequently misclassified. FAW05-5R0 is a TDK FAW-series AC-DC power supply, not a Yokogawa pulse-input module. TDK’s own product database identifies the part as an obsolete FAW-series supply, while Yokogawa-market listings associate the same hardware with the PW502-S1 power-supply designation.
The electrical specification is straightforward: 5 VDC at 5 A, or 25 W nominal output power. The original TDK FAW catalog specifies an 85–264 VAC input range, with nominal input ratings of 100–120 VAC and 200–240 VAC, making this an unusually flexible supply for legacy control-system equipment.
For sourcing purposes, the relationship should therefore be written as Yokogawa PW502-S1 / TDK FAW05-5R0, rather than treating FAW05-5R0 itself as a Yokogawa-developed I/O card.
FAW05-5R0
Key Technical Specifications
- TDK Part Number: FAW05-5R0
- Yokogawa Model: PW502-S1
- Power-Supply Series: FAW
- Power-Supply Type: AC-input, single-output switching power supply
- Rated Output Voltage: 5 VDC
- Rated Output Current: 5 A
- Rated Output Power: 25 W
- AC Input Voltage: 85–264 VAC
- Nominal Input Voltage: 100–120 VAC / 200–240 VAC
- Input Frequency: 47–66 Hz
- Nominal Frequency: 50–60 Hz
- Input Current: 0.7 A maximum at 100–120 VAC; 0.45 A maximum at 200–240 VAC
- Internal Fuse: 2.5 A
- Inrush Current: 43 A maximum at 100–120 VAC; 85 A maximum at 200–240 VAC under the catalog test condition
- Output Configuration: Single 5 VDC output
- Product Status: Obsolete / discontinued by TDK-Lambda
- Recommended TDK Alternate: HWS30A-5
- Alternate Compatibility: TDK explicitly states that interchangeability with HWS30A-5 is not guaranteed.
Electrical Architecture
The FAW05-5R0 is a compact industrial AC-DC supply designed to convert the incoming mains voltage into a regulated low-voltage DC rail.
Its principal rating is:
5 VDC × 5 A = 25 W
That 5 V rail is significant when the supply is being used inside legacy Yokogawa control equipment. A replacement supply should therefore not be selected merely because it can provide “5 V.” Output current capacity, transient response, physical mounting, connector assignment, grounding, and the original system’s startup behavior all need to be considered.
The wide input range of 85–264 VAC permits operation across common 100/120 V and 200/240 V systems. The TDK catalog also specifies 47–66 Hz operation, covering both 50 Hz and 60 Hz installations.
Yokogawa PW502-S1 Relationship
The PW502-S1 designation is important when this component is being sourced as a Yokogawa spare.
Current aftermarket listings explicitly identify:
- Yokogawa
- / FAW05-5RO
- 5 VDC power supply
as the same sourcing combination.
This explains why the same physical component may appear under either or in industrial surplus inventories.
For an existing Yokogawa installation, the Yokogawa equipment documentation and installed unit’s nameplate should remain the final compatibility reference.
Global Sourcing & Live-Test SOP
Inbound Verification
For a surplus / , record:
- TDK part number
- Yokogawa model designation where present
- Serial number
- Manufacturer markings
- Revision information
- Input-voltage marking
- Output-voltage/current marking
- Connector arrangement
- Mounting configuration
Photograph the label before cleaning.
A particularly useful procurement check is confirming that the physical unit is actually marked , because reseller catalogs sometimes mix , FAW05-5RO, PW501, and designations.
Electrical Inspection
Before energization:
- Inspect AC-input terminals.
- Check DC-output terminals.
- Inspect PCB and enclosure for corrosion.
- Look for overheated components.
- Check electrolytic capacitors for leakage or swelling.
- Verify fuse condition.
- Check insulation where appropriate.
- Confirm that the intended AC input is within the rating.
Do not connect a replacement supply to a Yokogawa system until its output polarity and connector assignment have been verified against the system drawing.
Live Test
A recommended bench test should include:
- Controlled AC input
- No-load startup
- 25%, 50%, 75%, and 100% representative load
- 5 VDC output measurement
- Output ripple measurement
- Startup behavior
- Input current measurement
- Thermal observation
- Extended-load operation
At the full rated load, the test should verify that the supply can sustain approximately 5 VDC at 5 A without abnormal temperature rise, oscillation, or output instability.
For a used unit, an extended heat run is particularly valuable because aged electrolytic capacitors can behave acceptably at startup while becoming unstable after thermal soak.
Final QC
After testing:
- Record measured output voltage.
- Record maximum test load.
- Record input voltage used during testing.
- Record temperature observations.
- Photograph the tested label.
- Preserve serial-number traceability.
- Protect connectors against contamination.
- Use ESD-safe packaging.
Field Engineer’s Pitfall Guide
❗ Do not describe as a Yokogawa pulse-input card.
That description appears on at least one reseller page, but it is contradicted by TDK’s own product documentation. TDK identifies as an AC-input power supply, rated 5 V/5 A.
❗ Do not assume HWS30A-5 is automatically a drop-in replacement.
TDK lists HWS30A-5 as a recommended alternate for the obsolete , but explicitly warns that interchangeability is not guaranteed. Mechanical dimensions, terminals, wiring, and system approval must be checked before substitution.
❗ Verify the Yokogawa system’s connector and polarity before installation.
The 5 V/5 A electrical rating alone does not establish drop-in compatibility. Legacy control systems can depend on specific connector pinouts, mounting arrangements, grounding schemes, and startup characteristics.
Intent-Driven FAQ
Q1. What is Yokogawa ?
The more accurate identification is , used/referenced as the Ywa power supply. It is a 25 W AC-DC switching power supply providing 5 VDC at 5 A.
Q2. Is a Yokogawa I/O module?
No. The original manufacturer documentation identifies as a TDK FAW-series AC-DC power supply. Reseller listings that call it a pulse-input card should not be used as the primary technical reference.
Q3. What is the output of ?
The rated output is 5 VDC at 5 A, for a nominal 25 W output.
Q4. What input voltage does support?
The original TDK specification gives an input range of 85–264 VAC, with nominal 100–120 VAC and 200–240 VAC operation. The specified frequency range is 47–66 Hz.
Q5. Is discontinued?
Yes. TDK lists the part as obsolete, with a discontinuation notice dated May 19, 2006. TDK gives December 29, 2006 as the last purchase-order date and March 30, 2007 as the last shipment date.
Q6. What is the recommended replacement for ?
TDK lists HWS30A-5 as a recommended alternate, but explicitly states that compatibility is not guaranteed. The complete mechanical and electrical interface must therefore be checked before substitution.
Q7. What should be checked when buyinged / ?
Verify the exact part marking, output voltage/current, AC input configuration, connector arrangement, mounting dimensions, insulation condition, capacitors, and output stability under load. For a legacy Yokogawa control system, also verhe identification against the system’s original power-supply documentation.
