PLCs, Power Supplies & Others

This module provides forced-air cooling for densely populated control chassis. It houses two independent fans that operate simultaneously or in a redundant configuration. Engineers rely on this unit to maintain safe operating temperatures within enclosed cabinets. The design prioritizes airflow efficiency and long-term mechanical reliability. Its compact form factor occupies a single rack slot while delivering substantial cooling capacity.

Fan Configuration and Airflow Performance

The 45C333 incorporates two 60 mm brushless DC fans with ball-bearing construction. Each fan delivers 35 cubic feet per minute of airflow at free air conditions. The combined airflow reaches 70 CFM when both fans operate at full speed. Each fan runs at 6200 RPM under normal operating conditions. This high rotational speed creates effective heat dissipation for power-hungry modules.

Redundancy and Fault Tolerance

Either fan can handle the full cooling requirement if the other unit fails. The module automatically detects a stalled or under-speed fan condition. Upon detecting a fault, the remaining fan increases to maximum speed immediately. This redundant design ensures continuous cooling even during single-fan failure events. Consequently, the system maintains thermal stability without requiring immediate maintenance intervention.

Electrical Specifications and Power Draw

The 45C333 operates from a nominal 24 VDC supply with ±10% tolerance. Each fan draws 250 mA at 24 VDC under full-speed operation. The total module current consumption reaches 500 mA when both fans run simultaneously. A built-in speed controller adjusts fan RPM based on measured ambient temperature. This variable-speed approach reduces power consumption and acoustic noise during partial load conditions.

Physical Dimensions and Rack Mounting

This module measures 12.7 cm in width, 25.4 cm in height, and 20.3 cm in depth. It weighs approximately 1.5 kg, which reflects the robust fan housings and motors. A steel enclosure with perforated front panels facilitates unimpeded airflow. The unit slides directly into standard 19-inch racks using conventional guide rails. Its front face features protective grilles that prevent accidental contact with rotating blades.

Connector Interfaces and Wiring

A 4-pin terminal block provides power and speed control connections on the rear panel. This block accepts wire gauges from 0.5 mm² to 2.5 mm² for secure terminations. The module also includes a 3-pin header for external tachometer signal monitoring. Each fan outputs a pulse train proportional to its rotational speed. These pulses enable external controllers to verify proper fan operation continuously.

Internal Components and Energy Storage

The 45C333 contains two brushless DC motors, two impellers, and four hall-effect sensors. Each motor incorporates integrated drive electronics for commutation and speed regulation. The module includes a 220 µF electrolytic capacitor for transient ride-through capability. This capacitor sustains fan operation during brief power sags up to 10 milliseconds. No battery or non-volatile memory exists on this purely electromechanical assembly.

Status Indication and Alarm Outputs

Two front-panel LEDs indicate the operational status of each fan independently. A green LED confirms normal rotation while a red LED signals fault conditions. The module provides a dedicated relay output for remote alarm annunciation. This relay energizes under normal conditions and de-energizes upon fan failure. Maintenance teams receive immediate notification when either fan requires attention.

Environmental Tolerances and Acoustic Data

The 45C333 operates effectively in temperatures from -10°C to 70°C. Each fan produces approximately 45 dB(A) of noise at full speed. The unit withstands humidity levels up to 95% non-condensing without performance degradation. Vibration resistance meets IEC 60068-2-6 standards for industrial environments. These specifications make the module suitable for demanding factory and process automation settings.

Technical Data Sheet – Reliance Electric 45C333

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