Watlow CAS200 - Manual (Page 70)

Chapter 4: Setup CAS200 User’s Guide
58 Watlow Anafaze
Setup Channel Alarms
The Setup Channel Alarms menu lets you access menus
which change alarm function parameters for the current
channel. The main alarms menu looks like this:
The CAS200 has three different kinds of alarms: failed
sensor alarms, global alarms, and process alarms.
Failed Sensor Alarms
Failed sensor alarms alert you to thermocouple breaks.
Global Alarms
Global alarms occur when a channel alarm is active and
unacknowledged, or when there are any unacknowledged
failed sensor alarms. (If an alarm occurs, the CAS200 front
panel displays an appropriate alarm code, see Chapter 3,
Using the CAS200 on page 35). Even if the alarm condition
goes away, the global alarm stays on until you use the front
panel Alarm Ack key to acknowledge it.
Process Alarms
Process alarms include high and low deviation and high
and low process alarms. You can set each of these alarms to
Off, Latched or Unlatched, as shown here.
• High process and high deviation alarms activate when
the process variable goes above a value you set. They
remain active until the process variable goes below
that value minus the deadband. (See the diagram
below.)
Function Description
Off No alarm
Latched
Alarm is only cleared if it is in a Non-
Alarming state and the ALARM RESET
key is pressed. If ALARM ACKNOWL-
EDGE has not been previously pressed,
the ALARM RESET will acknowledge
the global alarm as well.
Unlatched
Digital output activates on alarm, and
deactivates when channel is in a Non-
Alarming state. The ALARM ACK key
must be pressed to shut off the global
alarm.
CHANNEL PROCESS UNITS
CHANNEL NAME ALARM STATUS
SETUP CHANNEL 01
ALARMS ?