Mitsubishi A1S61PN Power Supply Module

The Mitsubishi A1S61PN is a high‑reliability power supply module designed for the MELSEC AnS series PLC racks. This module converts a standard 100‑240 V AC input into the regulated DC voltages required to power the CPU, I/O modules, and communication units installed on the base rack. Providing a robust 5 V DC / 5 A output for logic circuits and a 24 V DC / 1 A output for field devices, the A1S61PN is an essential component for building a stable and dependable control system.

The power supply features a wide input voltage range with automatic adaptation, making it suitable for global deployment without the need for voltage selection switches. It includes built‑in overcurrent, overvoltage, and thermal protection to safeguard the module and the connected components. The A1S61PN is designed with a compact footprint that matches the AnS form factor, allowing efficient use of cabinet space.

Technical Specifications

• Input voltage: 100‑240 V AC (allowable range 85‑264 V AC)

• Input frequency: 50/60 Hz (±5%)

• Input current: 1.5 A (at 100 V AC) / 0.7 A (at 200 V AC)

• Output voltage 1: 5 V DC (regulated), 5 A (max) – for PLC backplane

• Output voltage 2: 24 V DC (regulated), 1 A (max) – for sensors and output loads

• Output ripple: ≤ 50 mV (peak‑to‑peak) for 5 V, ≤ 100 mV for 24 V

• Hold‑up time: ≥ 20 ms (at 100 V AC input, full load)

• Efficiency: ≥ 78%

• Protection: Overcurrent (auto‑recovery), overvoltage (crowbar), short‑circuit, thermal shutdown

• Status indicators: Power‑on LED (green), Alarm LED (red – for fault conditions)

• Dimensions: 130 x 50 x 90 mm (H x W x D)

• Operating temperature: 0°C to +55°C

• Storage temperature: -20°C to +75°C

Key Functional Features

• Dual output rails: The separate 5 V and 24 V outputs isolate the sensitive logic circuits from the electrically noisy field power, enhancing overall system reliability.

• Automatic restart on fault recovery: After an overcurrent or thermal fault clears, the module automatically resumes normal operation, minimizing downtime.

• Built‑in surge absorber: Protects the PLC system from lightning‑induced surges and line transients commonly found in industrial power grids.

• Easy installation: The module slides directly into the designated slot on the AnS base rack and is locked in place with a simple lever mechanism.

Typical System Configurations

• AnS PLC racks: Supplying power to CPU modules (e.g., A2SCPU, A3ACPUGOT) and mixed I/O configurations.

• Distributed control panels: Used as the main power source for small to medium‑sized automation systems.

• Machine control cabinets: Providing isolated 24 V DC to proximity sensors, photoelectric sensors, and solenoid valves.

Installation and Wiring Guidance

Mount the A1S61PN in the leftmost slot (power supply slot) of the AnS rack. Connect the AC input wires to the L, N, and earth terminals, ensuring the protective earth is connected first. The 24 V DC output terminals (24+, 24‑) can be used to power external devices; however, the total load on this rail must not exceed 1 A. The 5 V output is supplied directly to the backplane and requires no external wiring. Use ferrules on all stranded wire terminations and tighten to the specified torque. For safety, install an external circuit breaker (rated 5 A) on the AC input line.

Standards and Certifications

The A1S61PN complies with EN 61131‑2 and carries CE, UL (cULus), and CSA certifications. It is designed for pollution degree 2 environments and meets RoHS requirements.

Conclusion

The Mitsubishi A1S61PN power supply module is a durable and efficient energy source for AnS series PLCs. Its wide input range, robust protection, and dual‑output design ensure that control systems receive clean, stable power, contributing to consistent machine performance and reduced maintenance costs.