Instruction Manual

4-8 Heater Controls
Figure 4-7
The Alarm tab, 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 automatically 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.