Valmet A413310 VPU – Automation Power Unit (230 VAC, 50 Hz, 1.5 A)

The Valmet A413310 VPU (Valmet Power Unit) is a robust industrial power supply designed to provide regulated DC power to Valmet DNA and Metso automation racks. Operating from a 230 V AC, 50 Hz mains input, it delivers a stable 24 V DC output at 1.5 A continuous, sufficient for powering small to medium I/O configurations, communication modules, and CPU boards. The unit is built for reliable operation in demanding industrial environments, with comprehensive protection against overload, short circuits, and transients.

Input and Output Specifications

The power unit accepts an input voltage of 230 V AC ±15 % at 50 Hz, with a maximum inrush current of 30 A. It provides a regulated 24 V DC output with a nominal current rating of 1.5 A (peak 2.0 A for 5 seconds). The output voltage is adjustable from 22 V to 28 V DC via a potentiometer, allowing users to compensate for voltage drops in long cable runs. Ripple and noise are less than 50 mV peak‑to‑peak, ensuring clean power for sensitive analog modules.

Protection and Safety Features

The VPU is equipped with multiple protection mechanisms: overvoltage protection (crowbar circuit), overcurrent protection (foldback current limiting), short‑circuit protection, and overtemperature protection with automatic restart. A built‑in fuse on the input is field‑replaceable. The unit provides a relay contact (dry contact) for remote fault signaling – this contact changes state in case of a power failure or overtemperature shutdown. The output is isolated from the input with a 1500 V AC isolation barrier.

Mechanical Design and Mounting

The unit is housed in a rugged metal enclosure (170 mm x 110 mm x 55 mm) designed for DIN rail (TS35) mounting. It features a green LED for power‑on indication and a red LED for fault conditions. The connection terminals are screw‑type, accepting wires up to 2.5 mm². The unit has ventilation slots on the top and bottom for natural convection cooling. It is IP20 rated and weighs approximately 0.9 kg.

Environmental and Compliance

Operating temperature range is ‑10 °C to +50 °C (derated to 40 °C at full load). Storage from ‑40 °C to +85 °C. Humidity tolerance is 10‑95 % non‑condensing. The unit meets EN 60950‑1 safety standards and EN 61000‑6‑2/‑4 EMC requirements. It carries CE and UL (cULus) certifications.

Installation and Wiring

Mount the VPU on a DIN rail inside the control cabinet, ensuring sufficient clearance for ventilation. Connect the AC mains supply to the L and N terminals (with a protective earth to the PE terminal). Connect the 24 V DC output to the rack’s power distribution bus or directly to modules. Use fuses on the output lines for additional protection. Ensure the cabinet is properly grounded.

Applications

This power unit is typically used to supply power to Valmet I/O racks, communication gateways, and small controller setups. It is suitable for powering up to 16 I/O modules or a combination of CPU and communication cards.

Maintenance and Troubleshooting

Periodically inspect the unit for dust accumulation and check the ventilation slots for blockage. If the red LED is on, check for overload or short circuit. Use a multimeter to verify the output voltage. The input fuse is accessible; replace it only with the specified type and rating. The unit is user‑serviceable only for fuse replacement; internal repairs should be carried out by qualified personnel.

Spare Parts and Ordering

Order the A413310 VPU as a complete unit. Replacement fuses and mounting brackets are available separately. Ensure the input voltage and frequency match your mains supply.

Conclusion

The Valmet A413310 VPU offers a dependable, compact power solution for automation systems, providing stable and protected DC power for critical control equipment.