PS-502-A1 YOKOGAWA

PS-502-A1 Yokogawa Input module

Brand：Yokogawa Model number：PS-502-A1

Country of origin: Japan Product weight：0.55kg

HS code：8538900000

Product Details：

Product Dimensions：

The PS-502-A1 acts as a voltage regulator and isolation barrier. It is designed to take an unstabilized 24 VDC field supply and convert it into a galvanically isolated 24 VDC auxiliary voltage. This regulated output is used to feed analog input and output loops or other logic-level components that require a stable power source. The module is built in a single Eurocard format, allowing it to be easily integrated into standard industrial racks. It features two red LEDs on the front panel to provide immediate visual feedback on the status of both the input field voltage and the regulated output voltage.

Product Parameters

Input Voltage: 24 VDC nominal field supply (tolerance of $\pm10\%$ , with temporary surges up to $+20\%$ ).
Input Ripple: Maximum 1 V top-to-top.
Regulated Output Voltage: 24 VDC (default $\pm1\%$ ), which can be fine-tuned via a front-mounted trimmer.
Output Current: Maximum 0.7 A for the regulated output.
Unregulated Output: Approximately 30 VDC ( $+10\% / -5\%$ ), current protected by the module's input fuse.
Isolation Voltage: 0.5 kV (test) between input and output.
Power Dissipation: 2 W at no load, increasing to 9 W at full load.
Efficiency: Approximately $67\%$ at full load using serial regulation.
Temperature Range: Operating from $-20^{\circ}C$ to $+70^{\circ}C$ ; Storage from $-25^{\circ}C$ to $+85^{\circ}C$ .
Mechanical Form: Single Eurocard format (6TE wide, $160 \times 100 \times 30 \text{ mm}$ ).
Connector Type: DIN 41612 Bauform F 48-pin.
Weight: Approximately 205 grams.

Product Advantages

High Reliability: Designed for mission-critical safety and logic systems, providing a stable power source for sensitive analog loops.
Galvanic Isolation: The isolation between input and output protects delicate control electronics from noise and surges present on the field power lines.
Redundancy Support: Multiple units can be connected in parallel to increase current capacity or to create a redundant power configuration. An internal serial diode prevents backfeeding in these setups.
Built-in Protection: Features electronic overvoltage protection (crowbar) and overcurrent protection (fold-back) to ensure the safety of connected equipment.
Monitoring Capabilities: Front-mounted test jacks allow technicians to measure output voltage and current directly without disconnecting the wiring.

Important Considerations

Lifecycle Status: The PS-502-A1 is a legacy product and has been discontinued by Yokogawa. Users should verify spare part availability or consider migration paths to newer ProSafe systems.
Heat Management: Due to its serial regulation design, the module dissipates more heat at full load (9 W). Ensure adequate ventilation within the cabinet to prevent overheating.
Fuse Protection: The unregulated output is protected by the module's input fuse (2 A fast-acting). If this fuse blows, all outputs will be lost.
Installation Environment: The module must be kept in a non-condensing environment (max 95% relative humidity) and should be protected from extreme vibration and shock.

Product Applications

The PS-502-A1 is utilized in demanding industrial sectors that require high-integrity power for control and safety systems.

ProSafe-SLS Systems: Serving as the primary auxiliary power source for solid-state logic cards in safety-instrumented systems.
Analog Loop Power: Providing the 24 VDC supply required for 4-20 mA sensors, transmitters, and valve positioners in process control.
Signal Conditioning: Powering auxiliary modules that require isolated and regulated DC to maintain signal accuracy.
Oil and Gas / Petrochemical: Used in remote instrument enclosures where field power may be unstable and requires local regulation for sensitive electronics.

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