Omega RD-MV100 Series, User Manual

Page: 130 / 299

6-9
Acknowledging and Setting Alarms
6
Explanation
Operation of the delay upper/lower limit alarm
For the operation of the delay upper/lower limit alarm, see section 1.5, “Alarm Function.”
This section will describe special cases of its operation.
• When delay alarm is set on a computation channel and the computation is
stopped
If the computation is stopped in a condition in which the computed value is exceeding
the alarm setting, the alarm is turned ON after the specified period (delay period)
elapses.
Alarm turns ON
T
Computed value
Computation stopped
Alarm setting
• Delay alarm when a power failure occurs
Alarm detection is reset upon a power failure. It restarts the operation after the power
recovers.
Power failure/recovery
Power failure/recovery
T T
T T
Alarm Off On Off On Off On Off
Measured/computed value
Alarm setting
• Operation when the alarm setting is changed
If a new delay alarm is set, the alarm detection starts at that time. It is unaffected by
the conditions existing before the alarm is set.
If the alarm setting of a preexisting delay alarm is changed
• If an alarm is not occurring at the time of the change, alarm detection starts at the
new setting.
• If an alarm is occurring at the time of the change and the alarm type is set to delay
upper limit alarm, the alarm continues as long as the input is above or equal to the
new setting. If the input is below the new setting, the alarm turns OFF. If the alarm
type is set to delay lower limit alarm, the alarm continues as long as the input is
below or equal to the new setting. If the input is above the new setting, the alarm
turns OFF.
6.3 Setting the Auxiliary Alarm Function (Basic Setting Mode)