User Manual

4-8 Heater Control for Windows
Figure 4-7
The Alarm dialog box shown in Figure 4-7 is used to setup the process alarms. An alarm can
be set for each loop. The alarms notify the user of changes and deviations from the
temperature Set Point.
Process alarms can be set to notify the operator and/or control the output in the event of
deviations from the Set Point. There are four alarm types: High Process, Low Process, High
Deviation and Low Deviation. Figure 4-8 shows the activation and deactivation points.
For each type of alarm, you assign an Output number, then select how the alarm should be
handled, or choose Off, for no alarm. If Alarm is chosen, you will get an alarm notice. In
FmNT, this notice is not readily visible, so it is recommended that you select Control. If you
select the Control setting, the output of the loop will be adjusted to the Set Point if the alarm
is activated. Setting this Set Point to zero ensures that the heater will shut off in cases of
over-heating. This is the recommended setting.
For Low/High Deviation alarms, set the number of degrees of deviations that you will allow
the Set Point to exceed before the alarm is activated and the output controlled.
· To return to the Heater Loop window, click on OK.
· To exit Heater Control, click on Exit.