Tandberg Data DPS Expansion Module Disk Pack Specifikace stáhnout pdf (Strana 44)

38 | Troubleshooting

If this occurs, take the following actions:

• Verify that the power connections to the power supply module are live.

• Disconnect the power supply module from power, remove the module from the system,

and then reinstall it. If the problem persists, contact Technical Support for information

about replacing the power supply module.

• Reduce the ambient temperature.

• Contact Technical Support to replace the faulty module as appropriate.

Thermal control issues

DPS Expansion Module uses extensive thermal monitoring and takes a number of actions to

ensure component temperatures are kept low and acoustic noise is minimized. Air flows from

the front to the rear of the enclosure.

If the ambient air is cool (below 25°C / 77°F) and the fans increase in speed, a restriction on

airflow may be causing additional internal temperature rise. This is not a fault condition.

The first stage in the thermal control process is for the fans to automatically increase in speed

when a thermal threshold is reached. This may be caused by higher ambient temperatures in

the local environment and may be perfectly normal.

Note

This threshold changes according to the number of drives and power supplies fitted.

Check the installation for any airflow restrictions at the front or rear of the enclosure.

A minimum gap of 25 mm (1 inch) at the front and 50 mm (2 inches) at the rear is

recommended.

If this occurs, take the following actions:

• Check for restrictions due to dust buildup, and clean as appropriate.

• Check for excessive recirculation of heated air from rear to the front. Use in a fully

enclosed rack installation is not recommended.

• Verify that all blank modules are in place.

• Reduce the ambient temperature.

Thermal alarm issues

If the OPS panel System Fault LED is ON, a Fault LED is lit on one or more power supply

modules, an audible alarm is sounding, or the air temperature exiting power supply is above

55°C (131°F), this signals a thermal alarm issue.

When the internal temperature measured in the airflow through the enclosure exceeds a

preset threshold, a thermal alarm will sound. This can also occur when a cooling fan module

fails.

If this occurs, take the following actions:

• Verify that the local ambient environment temperature is below the upper 40°C (104°F)

specification.

• Check the installation for any airflow restrictions at either the front or rear of the

enclosure. A minimum gap of 25 mm (1 inch) at the front and 50 mm (2 inches) at the rear

is recommended.

• Check for restrictions due to dust buildup, and then clean as necessary.

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Tandberg Data DPS Expansion Module Disk Pack Specifikace Strana 44