Watlow Series D8 User Manual
Page 114
Chapter 4: Operation and Setup
Series D8 User’s Guide
96
Watlow Anafaze
Doc. 0600-3120-2000
Alarm Function: Standard Alarm or Boost Output
You can configure each process alarm as either a standard
alarm or a boost alarm:
•
A standard alarm provides traditional alarm functional-
ity: The operator must acknowledge the alarm message
on the controller display, a latching global alarm is acti-
vated, and the alarm can activate a user-specified non-
latching alarm output.
•
A boost alarm provides on/off control output using the
alarm set points. For example, you could configure a
high deviation alarm to turn on a fan. The alarm activates
a user-specified non-latching output. Alarm messages do
not have to be acknowledged, and the global alarm is not
activated.
Alarm High and Alarm Low
An alarm high occurs if the process variable rises above a
user-specified value. An alarm low occurs if the process vari-
able drops below a separate user-specified value. See Figure
4.7
Enter the alarm high and low set points at the Alarm high SP
and Alarm low SP parameters in the Alarms menu.
Figure 4.7
Activation and Deactivation of
Process Alarms
Deviation Alarms
A deviation alarm occurs if the process deviates from set point
by more than a user-specified amount; see Figure 4.7. You can
Set point
Alarm high SP
Alarm low SP
}
Hysteresis
Alarm high on
Alarm high off
Alarm low on
Alarm low off
High deviation
alarm off
High deviation
alarm on
Low deviation
alarm off
Low deviation
alarm on
Set point + HiDeviation value
Set point - HiDeviation value
}
Hysteresis
}
Hysteresis
}
Hysteresis