APC AP9630 User's Guide download pdf (Page 34)

32UPS Network Management Card 2 User’s Guide

This displays the name, alarm status, temperature, and humidity (if supported) for each sensor. Click the name

of a sensor to edit the name and location and to configure its thresholds and its hysteresis.

Thresholds. For each sensor, you set the thresholds for temperature and (if supported) humidity measured at

the sensor. When a threshold is breached, the alarm signals.

High and Low are warning messages. Maximum and Minimum are critical, they must be dealt with.

Hysteresis. Use the Hysteresis value to avoid getting alarms repeatedly for the same violation of the

temperature or humidity threshold.

When the temperature or humidity that causes a violation tends to waver slightly up and down, it can

repeatedly trigger the alarm. A greater hysteresis value can prevent this.

If the hysteresis value is not great enough, the wavering can first cause a threshold violation and then clear it,

meaning the alarm can be triggered several times. See the examples below, after noting the following.

• For maximum and high threshold violations, the clearing point for the alarm is the threshold minus the

hysteresis value you input.

• For minimum and low threshold violations, the clearing point is the threshold plus the hysteresis value.

Example of rising but wavering humidity: Say the maximum humidity threshold is 65%, and the humidity

hysteresis is 10%. Then, the humidity rises above 65%, causing an alarm. It then wavers down to 60% and up

to 70% repeatedly, but

— because of the 10% hysteresis value — the alarm is not cleared and therefore no

new alarm occurs. For the existing alarm to clear, the humidity would have to drop below 55% (which is 65%

minus 10%).

Example of falling but wavering temperature: Say the minimum temperature threshold is 12°C, and the

temperature hysteresis is 2°C. Then the temperature drops below 12°C, causing an alarm. It then wavers back

up to 13°C and then down to 11°C repeatedly, but

— because of the 2°C hysteresis value — the alarm is not

cleared and therefore no new alarm occurs. For the existing alarm to clear, the temperature would have to rise

above 14°C (which is 12°C plus 2°C).

Input Contacts screen

Path: Universal I/O > Input Contacts

Input Contacts displays the name, alarm status, and state (open or closed) of each contact. These are

automatically found and displayed here when you install the environmental accessory.

Click the name of an input contact for detailed status or to configure its values. When disabled, the contact

generates no alarm even when it is in the abnormal position. Other fields are discussed below:

Output Relay screen

Path: Universal I/O > Output Relay

Field Description

Alarm Status

Normal if this input contact is not reporting an alarm, or the severity of the alarm if this input

contact is reporting an alarm. If not enabled for a contact, it displays Disabled.

State The present state of this input contact: Closed or Open.

Normal State The normal (non-alarm) state of this input contact: Closed or Open.

Severity

The severity of the alarm that the abnormal state of this input contact generates:

Warning or Critical.

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APC AP9630 User's Guide Page 34

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