Watlow 12LS Controller - Manual (Page 40)

4-7
4.2.4 ALARM DISPLAY
The ALARM display interrupts any system display. If more than one alarm is present the first alarm is shown.
|-------------------------------------------------|
¦ Process ¦
¦ Loop Variable Engineering ¦
¦ Number -| ¦ |- Units ¦
¦ ¦ ¦ ¦ ¦
¦ |----------------| ¦
¦ ¦08 200 °F ¦ ¦
¦ ¦LP 305HEAT 98¦ ¦
¦ |----------------| ¦
¦ Alarm ¦ ¦ ¦ ¦ Output Power ¦
¦ Status -| ¦ ¦ |- Percentage ¦
¦ Flashing ¦ ¦ ¦
¦ ¦ |- Loop Status ¦
¦ Setpoint -| ¦
|-------------------------------------------------|
Figure 4-4. ALARM DISPLAY
The ALARM display is the same as the SINGLE LOOP display except the alarm status is flashing. Refer to TABLE
4-2 for a list of the various alarm indicator symbols.
|--------------------------------------------------------------|
¦ Table 4-2. ALARM SYMBOLS ¦
|--------------------------------------------------------------¦
¦ Alarm ¦ Symbol Displayed ¦
¦ Condition ¦----------------------------------------¦
¦ ¦ Bar Graph Display ¦ Single Loop Display¦
|---------------------|-------------------¦--------------------¦
¦ High Process ¦ HP ¦ > ¦
¦ High Deviation ¦ HD ¦ > ¦
¦ Low Deviation ¦ LD ¦ < ¦
¦ Low Process ¦ LP ¦ < ¦
¦ Tolerance Error ¦ T ¦ T ¦
¦ (Ramp/Soak Only) ¦ ¦ ¦
|--------------------------------------------------------------|
When the ALARM ACK key is pressed the flashing stops but the alarm indicator remains as long as the alarm
condition exists. Pressing ALARM ACK acknowledges ALL alarms on thedisplayed loop.
If another alarm is present on another loop the display switches the ALARM display to that loop. In general multiple
alarms are displayed from the lowest loop to the highest loop.
Multiple alarms on a SINGLE LOOP are acknowledged in the sequence they occurred.
When all alarms are acknowledged the global annunciator digital output is cleared.