Dell S4048-ON EMC PowerSwitch Installation Guide March 2021 - Page 30

7 Fans The S4048-ON comes from the factory with one PSU and three fan modules installed in the chassis. The fan modules and the power supplies, which have integrated fans, are hot-swappable. NOTE: To run the switch, the three fan slots must have operating fan units. If you do not install a module in each slot, the switch shuts down in one minute. In addition to the power supply modules, you can order and install fan modules separately. The S4048-ON supports two airflow direction options. Do not mix airflow types in a chassis; you can use only a single airflow direction in a chassis. If the airflow directions are mismatched, the S4048-ON powers down in one minute. ● Normal-airflow is from the I/O-side to the PSU-side ● Reversed-airflow is from the PSU-side to the I/O-side All fans and PSUs in a configuration must be in the same airflow direction. Environmental factors can decrease the amount of time required between fan replacements. Check the environmental factors regularly. An increase in temperature and/or particulate matter in the air might affect performance; for example, new equipment installation. CAUTION: Check the fans at six-month intervals and replace them as necessary. Regularly monitor the speeds of the cooling fans in order to accurately determine replacement intervals. Topics: • Components • Fan module installation • Fan module replacement • After S4048-ON installation Components The following are the S4048-ON fan components: ● S4048-ON AC power supply with integrated fan module ● S4048-ON AC power supply with integrated fan module-reverse flow Figure 20. S4048-ON fan modules 1. Fan modules 30 Fans