Figure 5-4-2 Alarm Setup

Section 5 – Recorder Setup

5.4.1.1Alarm Setup

Pressing the edit button above takes you to the individual Alarm Setup dialog window shown below right.

The window will show the default Channel and Alarm setup based upon entry conditions – eg Channel 2 Alarm 1. The user can change the Alarm Number and the window will refresh and show the setup for that alarm.

Channel: The current channel that the alarm setup refers to. (1 to 18). Defaults to source.

Alm No: The current alarm for the current channel. (1 to 5)

Alarm Type: This drop down selection box allows the user to select one of the available alarm types. The Alarm types are: For Linear, Square Root, Frequency and Calculated inputs - None, High, Low, Rate, or Abnormal. For Dry Contacts and Conditional Inputs the alarm types

are - None, True (or Open), False (or Close) or Abnormal. Any unused alarm must be set to None.

Enable Checkbox: If checked this alarm is enabled, if unchecked this alarm is disabled. Note: to ensure that any alarms on this channel are active it is necessary to check the Channel Enable AND Master Enable in the Alarm Master Setup.

Notify Checkbox: If checked the system will attempt to send an email about this alarm condition provided the email smtp information is correctly setup.

Record Checkbox: If checked this alarm will trigger a recording to start if the record setup has been configured this way. See Section 5.6 Record Setup.

Setpoint: This is the value in the same engineering units as the channel that the alarm condition is tested against – also known as the threshold. In the above example, when the input is greater than (high alarm) 350, the alarm will be true. See the definition of other alarm conditions above.

Dead band: This value is the hysteresis for the alarm. Once the alarm is true (active) this value is subtracted from the setpoint and becomes the new setpoint for the alarm reset. In the above example the dead band is 10 so once an alarm is active, the input needs to drop below 340 (new threshold) to no longer be true or active. This prevents chatter about the alarm setpoint. Once the alarm is reset, no longer true, the setpoint is restored to the original value so the next alarm has to exceed 350 to once again be active. Note: The dead band cannot exceed the setpoint.

Delay: Enter the time in seconds from the point that the alarm condition becomes true (input exceeds setpoint) till it is actually reported as an alarm. If the alarm condition is reset (drops below the threshold) during this delay period, the alarm will not be reported. This feature prevents an alarm condition if the process is stable apart from a quick aberration that is recoverable.

Rate of Change: Enter the time in seconds (up to a maximum of 600) over which the input cannot change by more than the setpoint. For example, if the setpoint was 10 and the rate of change is 5 seconds, if the input changes by more than 10 in 5 seconds an alarm will occur. If the setpoint is positive the rate of change is measured on increasing changes, if the setpoint is negative, the rate of change is measure on decreasing changes.

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Omega Speaker Systems RD8300 manual Alarm Setup
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RD8300 specifications

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