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
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
7
30 Fans
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