Install Guide

Fans
The S3048ON 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, all slots must have operating fan units. If you do not install a module in each slot either as part of
the PSU or as an independent fan module, the switch shuts down in one minute.
In addition to the power supply modules, you can order and install fan modules separately.
The S3048-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 S3048-ON issues an alarm. You must correct the mismatched
airflow direction.
Normalairflow is from the I/O panel to the PSU.
Reversedairflow is from the PSU to the I/O panel.
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 fans to accurately determine replacement intervals.
Topics:
Components
Fan module installation
Fan module replacement
After installing the switch
Components
The following are the S3048ON fan components.
S3048-ON Fan module
S3048-ON Fan moduleReverse flow
Figure 13. S3048ON fan modules
1. Fan modules
7
Fans 25