Symptom | Cause |
| Action |
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If the ambient air is cool | The first stage in the thermal | 1 | Check the installation for any |
(below 25 °C) and the fans | control process is for the fans |
| airflow restrictions at either the |
are observed to increase in | to automatically increase in |
| front or rear of the enclosure. A |
speed, then some restriction | speed when a thermal |
| minimum gap of 25mm at the front |
on airflow may be causing | threshold is reached. This |
| and 50mm at the rear is |
additional internal | may be caused by higher |
| recommended. |
temperature rise. | ambient temperatures in the | 2 |
|
Note: This is not a fault | local environment and may | Check for restrictions due to dust | |
be perfectly normal. |
| ||
condition. | Note: This threshold | 3 |
|
| Check for excessive | ||
| changes according to the |
| of heated air from rear to the front. |
| number of drives and PCMs |
| Use in a fully enclosed rack |
| fitted. |
| installation is not recommended. |
|
| 4 Check that all Blank modules are in | |
|
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| place. |
|
| 5 | Reduce the ambient temperature. |
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122 |
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