Cherokee ACX643 REV-B Industrial Power Supply Unit

The Cherokee ACX643 REV-B is a high-efficiency switching power supply unit designed for industrial automation applications. It accepts a wide input voltage range of 100-240 V AC (50/60 Hz) and provides a regulated 24 V DC output at 10 A (240 W continuous). This PSU is suitable for powering PLCs, I/O modules, sensors, relays, and other 24 V DC loads in control cabinets. The unit features overvoltage, overcurrent, and short-circuit protection, and includes an active power factor correction (PFC) circuit. It is housed in a metal enclosure with screw terminals for easy field wiring, and can be DIN rail or panel mounted.

Technical Specifications

Input voltage: 100-240 V AC ±10%, 50/60 Hz. Input current: 3.0 A at 115 V AC, 1.5 A at 230 V AC. Output voltage: 24 V DC ±1% adjustable from 22-28 V DC via potentiometer. Output current: 10 A continuous, 12 A peak for 30 seconds. Ripple and noise: < 150 mV peak-to-peak. Efficiency: > 90% at full load. Hold-up time: > 20 ms at 230 V AC. Protection: overvoltage (latching), overcurrent (auto-recovery hiccup), short-circuit (constant current limiting). Operating temperature: -20°C to +70°C (derate linearly to 50% at 70°C). Dimensions: 123 mm × 85 mm × 110 mm. Weight: 1.2 kg. Mounting: DIN rail (35 mm) or screw holes. LEDs: green for output OK. Approvals: CE, UL, RoHS.

Key Features

• Universal AC input: 100-240V AC, 50/60 Hz

• Output: 24V DC, 10A (240W) regulated

• Adjustable output voltage (22-28V DC)

• High efficiency (>90%) reduces heat

• Overvoltage, overcurrent, short-circuit protection

• Active PFC to meet harmonic standards

• DIN rail or panel mounting

• LED indicator for power good

Applications

The ACX643 REV-B is used to provide stable 24V DC power to industrial control systems, including PLC CPUs (e.g., Siemens S7-1200, Allen-Bradley MicroLogix), distributed I/O modules, HMI panels, and field devices (sensors, valves). It is also suitable for powering small DC motors and actuators. Its high efficiency makes it ideal for continuous operation in sealed cabinets.

Installation and Wiring

Mount the PSU on a DIN rail by clipping onto the 35 mm rail. Provide at least 50 mm clearance above and below for air circulation. Connect AC input wires (L, N, and earth) to the screw terminals (use 2.5 mm² wire). Connect the output (+ and -) to the PLC power bus. The adjustable potentiometer (accessible via top opening) allows fine-tuning of output voltage (nominal 24V). For higher current applications, use multiple units in parallel (with external decoupling diodes). The green LED lights when output is within regulation. The PSU includes a remote on/off control (optional).

Protection and Derating

At ambient temperatures above 50°C, the output current must be derated. For example, at 60°C, maximum current is 7.5 A; at 70°C, 5 A. The overcurrent protection uses a foldback characteristic; after a short circuit, the unit will attempt to restart automatically. Overvoltage protection triggers at approx. 30V and latches; cycle input power to reset.

Maintenance and Safety

No routine maintenance is required. Keep the ventilation slots clear. Do not open the case; hazardous voltages inside. Replace the unit if the output LED is off despite correct input voltage. Store spare units in a dry, static-safe environment.

Environmental and Compliance

The Cherokee ACX643 REV-B is CE and UL 508 listed. It meets EN 61000-6-2 and EN 61000-6-4. Operating temperature: -20°C to +70°C. Humidity: 5-95% non-condensing. Protection rating: IP20.

Conclusion

The Cherokee ACX643 REV-B power supply delivers reliable 24V DC power for industrial automation systems. Its robust design, wide input range, and comprehensive protections make it a suitable choice for PLC-based control cabinets.