WEIR WE203 Power Supply Module

The WEIR WE203 (variant 00 00 02) is a dedicated power supply module designed for the LEMBDA Group's Unitech PLC systems. This unit provides a regulated 24 V DC output with high efficiency and low ripple, ensuring stable power to the PLC CPU, I/O modules, and field devices. It features a wide input voltage range (100‑240 V AC) and includes comprehensive protection against overvoltage, overcurrent, and short‑circuit conditions.

The module is built with industrial‑grade components and a robust housing, suitable for mounting in control cabinets. It includes LED indicators for power‑on and fault status. The WE203 is designed for hot‑swap capability (when used with a redundant configuration) and offers a power factor correction (PFC) for improved energy efficiency.

Technical Specifications

• Model: WE203 (00 00 02)

• Input voltage: 100‑240 V AC (±10%), 50/60 Hz

• Output voltage: 24 V DC (regulated, ±5%)

• Output current: 5 A (continuous), 6 A peak (for 2 seconds)

• Output power: 120 W

• Efficiency: > 87% (at full load)

• Ripple and noise: ≤ 100 mV peak‑to‑peak

• Hold‑up time: ≥ 20 ms at 100 V AC input

• Protection: Overvoltage (crowbar), overcurrent (hiccup mode), short‑circuit (auto‑recovery), thermal shutdown

• Isolation: 3000 V AC (input to output)

• LED indicators: Green (power ON), Red (fault)

• Operating temperature: -10°C to +60°C

• Dimensions: 120 x 90 x 70 mm (W x H x D)

• Certifications: CE, UL, RoHS

Key Features

• Universal input: Automatically adjusts to any AC mains voltage from 100 to 240 V, simplifying global deployment.

• Redundancy ready: Supports parallel operation with OR‑ing diodes for N+1 redundancy in critical applications.

• Diagnostic output: A relay contact provides a "power OK" signal for PLC monitoring.

• Fanless cooling: Convection cooling ensures silent operation and high reliability in dusty environments.

• Active PFC: Reduces harmonic distortion, complying with EN 61000‑3‑2.

Typical Applications

• Unitech PLC systems: Powering the CPU and I/O racks in industrial control panels.

• Machine control: Supplying 24 V DC to sensors, relays, and solenoid valves.

• Process automation: Providing stable power to measurement and control devices.

• Retrofit projects: Replacing older power supplies in existing panels with a modern, efficient unit.

Installation and Wiring

Mount the unit on a DIN rail or panel using the provided clips. Connect the AC input (L, N, PE) with an appropriate fuse (recommended 6 A slow‑blow). The DC output terminals are marked +V and –V; use proper wire gauge for the expected current. The diagnostic output is connected to a PLC input for remote monitoring. Ensure adequate clearance around the unit for heat dissipation. The unit must be earthed via the PE terminal.

Compliance

The WE203 complies with EN 60950‑1 (safety), EN 61000‑6‑2/‑4 (EMC), and carries CE and UL marks. It is RoHS compliant and designed for pollution degree 2.

Conclusion

The WEIR WE203 power supply module offers reliable, efficient, and safe power conversion for Unitech PLC systems. Its robust construction and protection features ensure long‑term stability in industrial environments.