The Nabco PSU-22 is a high-reliability power source unit specifically engineered for industrial automation and control environments. It serves as the primary energy distribution hub for localized control circuits, ensuring that sensitive electronic components receive a stable, filtered DC voltage. Built to withstand the rigors of heavy industry, the PSU-22 features robust surge protection and thermal management, making it an ideal choice for critical systems where downtime is not an option.

Technical Specifications and Datasheet

The following specifications define the physical and electrical characteristics of the PSU-22 Power Source Unit.

• Part Number: PSU-22
• Manufacturer: Nabco (Nabtesco)
• Dimensions (H x W x D): 180 mm x 120 mm x 85 mm
• Weight: 1.10 kg
• Country of Origin: Japan (JP)
• Input Voltage: 100–240V AC (Universal Range)
• Output Voltage: 24V DC (Regulated)
• Output Current: 2.5A to 5.0A (Model dependent)
• Efficiency: >85% at full load
• Mounting: DIN Rail or Panel Mount

 

Application Fields

This power unit is widely deployed across sectors requiring precise voltage stability:

• Pneumatic Control Systems: Providing steady power to solenoid valves and air manifold controllers.
• Maritime Engineering: Used in shipboard automation for bridge control and engine monitoring systems.
• Rail Transportation: Powering onboard door control units and braking logic modules.
• Factory Automation: Supporting PLCs, sensors, and human-machine interfaces (HMIs) on assembly lines.

 

Usage Instructions

To ensure the safety and performance of the PSU-22, follow these operational guidelines:

1. Input Wiring: Ensure the AC input leads are securely fastened to the L (Live) and N (Neutral) terminals. Always connect the PE (Protective Earth) terminal to a reliable ground point.
2. Load Balance: Do not exceed the rated output current. Overloading the unit may trigger the internal protection circuit, causing a temporary shutdown.
3. Ventilation: Install the unit in a vertical orientation to facilitate natural convection. Maintain at least 20mm of clearance on all sides to prevent overheating.
4. Terminal Checks: Due to industrial vibrations, check the terminal screw tightness every six months to prevent arcing or power loss.

 

Common Questions and Answers (Q&A)

Q: Does the PSU-22 have short-circuit protection? A: Yes, the unit is equipped with automatic short-circuit and overload protection. It will typically enter “hiccup mode” or shut down until the fault is removed, then restart automatically.

Q: Can I use this unit in outdoor cabinets? A: The PSU-22 should be housed in an enclosure with at least an IP54 rating if used outdoors, as it is designed for clean, dry industrial environments (IP20 equivalent).

Q: Is the output voltage adjustable? A: Most PSU-22 models feature a small potentiometer on the front panel that allows for fine-tuning of the DC output (typically ±5%) to compensate for voltage drops over long cable runs.

Q: How do I know if the unit is functioning correctly? A: A green “DC OK” LED indicator on the front faceplate illuminates when the output voltage is within the nominal operating range.

 

Related Model Recommendations

1. Nabco PSU-24 (Higher capacity variant)
2. Nabco PSU-11 (Compact series)
3. Nabtesco 154-1221-00 (Specialized control board)
4. Nabco VCU-10 (Valve Control Unit)
5. Nabco MCU-22 (Monitoring Control Unit)