13
5. To select an automatic alarm reset, press the MENU key when the Auto
Reset screen is blinking.
6. To go to the Alarms Off Screen, press the DOWN arrow key. Refer to
Figure 15. If selected, refer to Alarms Auto Reset procedure, below.
ALARM SETPOINTS
OFF
FIGURE 15. ALARM SETPOINT OFF SCREEN
7. To select alarms off, press the MENU key when the ALARMS - OFF
screen is blinking.
8. After alarm selection, press the MENU key to move on to Alarm Hyster-
esis. After setting Alarm Hysteresis, press the MENU key again to move
on to the Audible Alarm screen.
Process Alarms
Process alarms are absolute values. These values remain the same no mat-
ter what the setpoint temperature is set to. For example: if the operator sets
an alarm to trigger at 60 degrees Celsius and the SP (setpoint) temperature
is set at 55 degrees Celsius, the alarm will trigger at 60 degrees. If the opera-
tor resets the SP temperature to 57 degrees, then the process alarm value
will stay at the already set 60 degrees.
There are three types of process alarms: PROCESS HI, PROCESS LO, and
PROCESS HILO. Refer to the following paragraphs for more information.
Process HI
1. Process HI is a fixed value and will not change if the SP temperature
value is changed. It activates the alarm when the PV temperature ex-
ceeds the set alarm temperature. Refer to Figure 16. If the Control Action
is set to COOL and the PV temperature exceeds the alarm temperature
when the RUN key is pressed, the alarm will not be activated. The PV
temperature must first fall below the alarm temperature before the high
alarm is enabled. This allows for normal system startup without activat-
ing the alarm.
ALARM MODE
PROCESS - HI
FIGURE 16. PROCESS HI SCREEN
