Watlow CAS - Manual (Page 49)

Using the CAS
CAS User’s Guide 39
Alarms
If an alarm occurs, an eight character alarm code is displayed in the
lower-right section of the display. If a Failed Sensor alarm occurs, the
controller also displays this short alarm message:
These alarm codes and messages are shown in the table below.
Acknowledging an Alarm
Press the Alarm Acknowledge key to acknowledge an alarm. If there are
other channels with alarm conditions, the Alarm display switches to the
next channel in alarm. Acknowledge all alarms to clear the global alarm.
The Alarm Acknowledge key operates differently in latched and
unlatched modes. In latched mode, an alarm can only be cleared when
the process is in a non-alarming state, and the Alarm Reset key is
pressed. In un-latched mode, the alarm clears automatically when the
Alarm Acknowledge key is pressed and the system is in a non-alarming
state.
Resetting an Alarm
Pressing the Alarm Reset key clears an alarm only if the system in a
non-alarming state. Otherwise, the key will operate the same as the
Alarm Acknowledge key.
Alarm Message Alarm Type
TC BREAK Thermocouple Break
HIGH PRC High process alarm
HIGH DEV High deviation alarm
LOW DEV Low deviation alarm
LOW PRC Low process alarm
CHANNEL PROCESS UNITS
CHANNEL NAME ALARM STATUS
01 90 °F
HTR1 HIGH PRC
Process Variable Engineering Units
Channel Number
Channel Name
Alarm Message