Dell Managed PDU LED Manual de usuario descargar pdf (Pagina 124)

USER’S GUIDE

Managed Rack PDU

119

Hysteresis. This value specifies how far past a threshold the temperature or humidity

must return to clear a threshold violation.

• For Maximum and High temperature threshold violations, the clearing point is the

threshold minus the hysteresis.

• For Minimum and Low humidity threshold violations, the clearing point is the

threshold plus the hysteresis.

Increase the value for Temperature Hysteresis or Humidity Hysteresis to avoid multiple

alarms if temperature or humidity that has caused a violation then wavers slightly up

and down. If the hysteresis value is too low, such wavering can cause and clear a

threshold violation repeatedly.

Example of rising but wavering temperature: The maximum temperature threshold

is 85°F, and the temperature hysteresis is 3°F. The temperature rises above 85°F,

violating the threshold. It then wavers down to 84°F and then up to 86°F repeatedly, but

no clearing event and no new violation occur. For the existing violation to clear, the

temperature would have to drop to 82°F (3°F below the threshold).

Example of falling but wavering humidity: The minimum humidity threshold is 18%,

and the humidity hysteresis is 8%. The humidity falls below 18%, violating the

threshold. It then wavers up to 24% and down to 13% repeatedly, but no clearing event

and no new violation occur. For the existing violation to clear, the humidity would have

to rise to above 26% (8% past the threshold).

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Dell Managed PDU LED Manual de usuario Pagina 124