Siemens 6ES5988-3LA31 Fan Tray Assembly

Active Cooling for S5-135U/155U Racks

The Siemens 6ES5988-3LA31 fan tray assembly provides forced-air cooling for S5-135U and S5-155U PLC racks. This unit draws ambient air through the chassis, removing heat generated by installed modules. Dense rack configurations benefit from this active thermal management solution.

Airflow Performance and Acoustic Specifications

This fan tray assembly delivers an airflow rate of 200 cubic meters per hour at free air conditions. The unit operates at a noise level of 52 decibels, suitable for control room environments. An integrated temperature sensor activates the fans only when needed, saving energy. Furthermore, the assembly includes a speed controller for adjustable airflow based on cooling demands.

Fan Technology and Speed Control

The Siemens 6ES5988-3LA31 employs three ball-bearing fans with a rated lifetime of 40,000 hours at 25°C. An integrated speed controller adjusts the airflow based on the actual cooling requirements. The fans automatically switch to maximum speed when the rack temperature exceeds the setpoint. This smart control reduces noise and energy consumption during partial load conditions.

Filter Design and Maintenance Access

This fan tray assembly incorporates a washable filter that captures airborne dust and particles. The filter prevents contaminants from entering the rack and damaging sensitive electronics. Users can remove and wash the filter without special tools or system shutdown. Regular filter maintenance extends fan life and maintains cooling efficiency.

Physical Design and Installation

You can install this fan tray assembly at the bottom or top of S5-135U or S5-155U racks. The unit requires no additional mounting hardware and fits into dedicated slots. The assembly connects to the backplane for power and status monitoring. The installation orientation allows unrestricted airflow through the chassis.

Diagnostic Features and Status Monitoring

Front-panel LEDs indicate power, fan status, and fault conditions for each fan. The assembly provides a collective fault signal to the CPU for remote monitoring. A built-in self-test routine verifies fan operation during system startup. Additionally, the assembly stores operating hours and fault history for maintenance planning.

Application Guidelines and Environmental Ratings

This fan tray assembly operates reliably from 0°C to 60°C with non-condensing humidity up to 95%. For optimal cooling, maintain at least 50 mm clearance at the air inlet and outlet. The assembly meets CE and UL standards for industrial control equipment. Regular inspection of fan operation ensures continued cooling performance.